bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Probing of Atmospheric Turbulence Along the Propagation Direction Using a Single Transmitter Aperture and Multiple Pairs of Longitudinally Structured Beams
Authors: Zhou Huibin , Su Xinzhou , Duan Yuxiang , Hu Nanzhe , Song Hao , Zhang Runzhou , Song Haoqian , Zou Kaiheng , Pang Kai , Tur Moshe , Willner Alan E.
Published: August 2022

We experimentally demonstrate the probing of turbulence along the propagation direction by transmitting multiple complementary pairs of longitudinally structured beams between a single transmitter/receiver aperture pair. The results show probing errors could be reduced by >~25% when using pairs of beams compared to using only one type of beam.
FEC-free optical data transmission with a chip-integrated microresonator frequency comb source
Authors: Kogure Soma , Ohtsuka Tamiki , Fujii Shun , Kumazaki Hajime , Tanaka Shuya , Hashimoto Yosuke , Kobayashi Yuta , Araki Tomohiro , Furusawa Kentaro , Sekine Norihiko , Tanabe Takasumi
Published: August 2022

We investigated the feasibility of IM-DD communication in a microcomb. Turing pattern and soliton combs are ideal, though MI comb can transmit signals when the pump-detuning is well controlled and excessive noise is suppressed.
A Novel 16-Channel WDM Silicon Photonics Transceiver with Interleavers for Simplified Ring Modulator/Filter Implementation
Authors: Liu Yuan , Gambini Fabrizio , Pinna Sergio , Meena G. G. , Moreira Renan , Preisler Edward , Klamkin Jonathan
Published: August 2022

We present a compact ring resonator based silicon photonics transceiver with 16-channel wavelength-division-multiplexing. 56 Gbps data transmission was achieved for a single ring modulator in depletion mode operation, which can support tera-bits-per-second capability for the transceiver.
High Extinction Ratio Microring Modulator
Authors: van Niekerk Matthew , Cheng Chanel , Leake Gerald , Coleman Daniel , Fanto Michael L. , Preble Stefan F.
Published: August 2022

We design and demonstrate a high extinction ratio (ER) microring modulator. The modulator has a high ER of 27 dB across the wafer, and a measured ER of > 13.9 dB for modulation speeds up to 20 Gbps.
Multi-Channel Network of the Optical Hitless Wavelength-Selective Switches Using the MZI-Embedded MRR
Authors: Chen Bei , Liu Xiaozhi , Zhang Zhaoyang , Ye Li’ao , Su Lianghao , Yu Hui , Wang Yuehai , Yang Jianyi
Published: August 2022

We demonstrate the multi-channel optical hitless wavelength-selective switches using the MZI-embedded MRR. The rising response time is about 4.8 µs and it can realize hitless rerouting of multi-wavelength signals without interruption.
Attosecond Science at ELI Scale
Authors: Varjú Katalin
Published: August 2022

ELI-ALPS facility supports laser based fundamental and applied research at extreme short timescales, operating specialized lasers which drive nonlinear frequency conversion and acceleration processes. The attosecond beamlines based on advanced HHG techniques will be reviewed.
Nonlinear chirped Doppler interferometry for ultrafast χ(3) spectroscopy
Authors: Neradovskaia Elizaveta , Maingot Benjamin , Chériaux Gilles , Claudet Cyrille , Forget Nicolas , Jullien Aurélie
Published: August 2022

We report a novel jitter-free ultrafast spectroscopy method to investigate third-order nonlinearity. The method is applied to assess the nonlinear refractive indices of ori-entated, nematic liquid crystals in the femtosecond regime.
Energy Scaling Beyond Gas-Ionization Thresholds with Divided-Pulse Nonlinear Compression
Authors: Jenkins Gregory W. , Feng Chengyong , Bromage Jake
Published: August 2022

Pulse compression through self-phase modulation in gas is limited to pulse intensities below the gas’s ionization threshold. We demonstrate that divided-pulse nonlinear compression can overcome gas ionization limitations and improve the energy throughput by 3×.
Cavity-Enhanced Few-Cycle Mid-IR Pulses for Field-Resolved Spectroscopy
Authors: Sulzer Philipp , Högner Maximilian , Raab Ann-Kathrin , Fürst Lukas , Fill Ernst , Gerz Daniel , Hofer Christina , Voronina Liudmila , Pupeza Ioachim
Published: August 2022

Up to tenfold power enhancement of waveform-stable few-cycle pulses is demonstrated in a minimally-dispersive resonator (22-37 THz). This enables spectroscopy of molecular samples based on impulsive excitation and electro-optic sampling at 66 m interaction length.
Laser fabricated optical fibers with 3D printed cores
Authors: Maniewski Pawel , Harvey Clarissa M. , Oriekhov Taras , Mühlberger Korbinian , Brunzell Martin , Laurell Fredik , Fokine Michael
Published: August 2022

We utilized a powder-based, 3D printing technique for prototyping optical fibers. Co-doped silica rods were printed using sub-micron powders with various compositions. The rods were sleeved and drawn into fibers. Ti/Al/Er-co-doped fibers are demonstrated.
Fabrication of Waveguides and Gradient Index Flat Optics by Nanoimprinting Refractive Index
Authors: Hardison Anna L. , Talukdar Tahmid H. , Kravchenko Ivan I. , Ryckman Judson D.
Published: August 2022

We report the fabrication of gradient index flat optics and waveguides using the ‘nanoimprinting refractive index’ (NIRI) technique applied to mesoporous silicon substrates. Optical wavefront shaping and waveguiding are demonstrated in the visible and near-infrared respectively.
Multiple concentric rainbows induced by microscale concave interfaces for reflective displays
Authors: Rada Jacob , Hu Haifeng , Zhou Lyu , Zeng Jing , Song Haomin , Zeng Xie , Shimul Shakil , Fan Wen , Zhan Qiwen , Li Wei , Wu Limin , Gan Qiaoqiang
Published: August 2022

We unambiguously define the physics behind structural coloration induced by microscale concave interfaces using both white light, and single wavelength illumination.
Generating a Space-Time Pulse in Free Space after Multimode Fiber Propagation in which Fiber Modal Coupling is Mitigated, Divergence is Reduced, and Group Velocity is Tuned
Authors: Zou Kaiheng , Pang Kai , Song Hao , Karpov Maxim , Su Xinzhou , Zhang Runzhou , Song Haoqian , Zhou Huibin , Kippenberg Tobias J. , Tur Moshe , Willner Alan E.
Published: August 2022

We experimentally demonstrate the generation of a space-time pulse in free-space after 1-m multi-mode fiber propagation. The generated space-time pulse has reduced diffraction and a tunable group velocity from 1.0042c to 0.9967c.
Towards an all-Fiberized GHz Self-Referenced Electro-Optic-Modulated Comb
Authors: Trask Lawrence Robert , Pericherla Srinivas Varma , Delfyett Peter J.
Published: August 2022

We present a new cost-effective, fiberized architecture for generating low noise, sub-100 fs, 12 kW peak power pulses using GHz spaced, filtered electro-optic modulated combs (>70dB OSNR), and nonlinear-pulse-shaping.
Towards high-sensitivity mid-IR dual-comb spectroscopy via solid-state laser driven optical parametric oscillators
Authors: Bauer Carolin P. , Pupeikis Justinas , Willenberg Benjamin , Camenzind Sandro L. , Phillips Christopher R. , Keller Ursula
Published: August 2022

We demonstrate a dual-comb 80-MHz optical parametric oscillator from a single-cavity and a diode-pumped 250-MHz Yb:YAG dual-comb oscillator. Their combination can lead to a low-noise source in the mid-IR with high-power per comb line.
Novel dual-comb multiplexing technique for low-noise solid-state lasers
Authors: Willenberg Benjamin , Pupeikis Justinas , Camenzind Sandro L. , Benayad Abdel , Camy Patrice , Phillips Christopher R. , Keller Ursula
Published: August 2022

We present a new cavity multiplexing method to support a pair of noise-correlated, yet cavity length independent modes. 2.1-W of average power per 140-fs, 80-MHz pulse train are achieved with a low uncorrelated timing jitter.
Linear Broadband Differential Phase Measurement of Soliton Microcombs
Authors: Twayana Krishna , Lei Fuchuan , Ye Zhichao , Helgason Óskar B. , Salgado Israel Rebolledo , Karlsson Magnus , Torres-Company Victor
Published: August 2022

We demonstrate complex (amplitude and phase) spectral characterization of a 100 GHz repetition rate microcomb over a bandwidth exceeding C and L bands using a linear stepped heterodyne technique.
Towards Ultrahigh Quantum Cooperativity with Side-coupled 2D Optomechanical Crystals
Authors: Sonar Sameer , Hatipoglu Utku , Ren Hengjiang , Meesala Srujan , Lake David , Painter Oskar
Published: August 2022

We present the design and fabrication of side-coupled 2D optomechanical crystals. By mechanically disconnecting the optical waveguide from the cavity, we expect to remove a significant contribution to the thermal bath limiting the optomechanical cooperativity.
In-Situ Tuning of Optomechanical Crystals with Nano-Oxidation
Authors: Hatipoglu Utku , Sonar Sameer , Painter Oskar
Published: August 2022

We present a method that employs nano-oxidation by an atomic-force microscope (AFM) to achieve in-situ, selective and simultaneous tuning of the optical and acoustic resonance frequencies of silicon optomechanical crystal cavities.
Thermal Bistability Induced by Optomechanical Oscillations
Authors: Fu Zhoutian , Yang Lan
Published: August 2022

We report the observation of thermal bistability induced by optomechanical oscillation in an optical microcavity. It is shown experimentally and theoretically that such bistability appears due to optomechanically modulated photon number.
Silicon Photonic Neuromorphic Computing with 16 GHz Input Data and Weight Update Line Rates
Authors: Tsakyridis Apostolos , Giamougiannis George , Mourgias-Alexandris George , Totovic Angelina , Dabos George , Passalis Nikolaos , Kirtas Manos , Tefas Anastasios , Moralis-Pegios Miltiadis , Pleros Nikos
Published: August 2022

We experimentally demonstrate a silicon photonic neuron that supports on-chip input-data and weight update rates at 16GHz. Its computational performance is evaluated via the classification of the MNIST dataset achieving a mean accuracy of 99.18%.
Coherent optical neural network with injection-locked VCSELs
Authors: Chen Zaijun , Sludds Alex , Davis Ronald , Bernstein Liane , Ateshian Lamia , Christen Ian , Heuser Tobias , Lott James , Reitzenstein Stephan , Englund Dirk , Hamerly Ryan
Published: August 2022

We demonstrate analog coherent homodyne photoelectric multiplication with phase-modulated VCSEL arrays (operating at Vπ= 2 mV). Precise phase control over individual laser emitters enables MNIST image classification with accuracy near the ground truth.
Ultra-Low-Power Unitary Matrix Multiplier Based on Silicon Photonic MEMS
Authors: Kim Dong U. , Kim Do Y. , Jeong Youngjae , Choi Dong J. , Park Young J. , Her Man J. , Hong Myung S. , Lim Min G. , Rah Yoonhyuk , Yu Kyoungsik , Han Sangyoon
Published: August 2022

We propose and demonstrate an ultra-low-power 3×3 unitary matrix multiplier with MEMS-based tunable couplers and phase shifters. The static power consumption and tuning energy per tuning element are less than 0.13 µW and 115 pJ, respectively.
Scalable Ultralow Latency Photonic Tensor Processor
Authors: Bernstein Liane , Sludds Alexander , Panuski Christopher , Mills Sivan Trajtenberg , Hamerly Ryan , Englund Dirk
Published: August 2022

We propose a photonic processor with the potential to compute deep neural network layer outputs in ∼10 ns. Our proof-of-concept experiments show low loss of classification accuracy on the MNIST dataset; we investigate fundamental throughput limits.
PT-Symmetric Coupled-Cavity AlGaAs Laser for Tunable THz Generation
Authors: Wilkey Andrew , Jia Yufei , Zhao Yifan , Jarrahi Mona , Khajavikhan Mercedeh
Published: August 2022

We report the design and fabrication of a PT-symmetric coupled-cavity AlGaAs MQW laser for THz beat frequency generation. The THz frequency can be tuned by varying the gain contrast between the two individual resonators.
Coherently driven ring quantum cascade lasers
Authors: Kazakov Dmitry , Piccardo Marco , Letsou Theodore L. , Beiser Maximilian , Zhi Yiyang , Columbo Lorenzo , Brambilla Massimo , Schwarz Benedikt , Capasso Federico
Published: August 2022

Ring quantum cascade lasers generate self-starting frequency combs and dissipative cavity solitons. We present a reengineered ring resonator with an evanescent wave directional coupler that allows coherent control over laser state and enhances power extraction.
324-fs Pulses from a SESAM Modelocked 2-µm GaSb-VECSEL without an Intracavity Heat Spreader
Authors: Heidrich Jonas , Gaulke Marco , Golling Matthias , Barh Ajanta , Keller Ursula
Published: August 2022

We present the first modelocked backside-cooled GaSb-VECSEL operating at 2061 nm, producing shortest pulses of 324 fs with record high average output power up to 65 mW at 3 GHz repetition rate.
Long-range photodetection of organic exciton-polaritons
Authors: Liu Bin , Huang Xinjing , Forrest Stephen R.
Published: August 2022

In light-matter strong coupling regime, we observe long-range photodetection response at room temperature mediated by organic exciton-polaritons, which results from strong interactions between organic excitons and low-loss Bloch surface wave (BSW) modes.
Logical WGM laser assisted by mesogens scattering
Authors: Zhu Hong Yang , Hu Zhi Xin , Zhang Wei Li
Published: August 2022

We proposed an all-in-one scattering-assisted mesogens micropillar laser with self-seeding and self-guiding. Based on the hysteresis characteristics of the electrically anchored mesogens under the interaction of thermal force, an erasable active memory device is realized.
Tailoring Recombination Dynamics in APbBr3 Single Crystals
Authors: Shrivastava Megha , Kala Abhinav , Dirin Dmitry , Bodnarchuk Maryna I , Achanta Venu Gopal , Kovalenko Maksym V , Adarsh K. V.
Published: August 2022

Herein, phonon population governed retardation of carrier-recombination and thermal expansion assisted unusual blueshift of photoluminescence is demonstrated in perovskite single crystals using temperature-dependent studies. Our results promote potential candidature of perovskites in photovoltaics.
Imaging the field profile inside dielectric laser acceleration nanostructures
Authors: Fishman Tal , Haeusler Urs , Dahan Raphael , Yannai Michael , Adiv Yuval , Abudy Tom Lenkiewicz , Eyal Ori , Yousefi Peyman , Shiloh Roy , Eisenstein Gadi , Hommelhoff Peter , Kaminer Ido
Published: August 2022

We present deep sub-wavelength measurement of the field distribution inside nanophotonic dielectric laser accelerator structures, using photon-induced nearfield electron microscopy. Comparing the measured field with theory provides new insight into accelerators’ performance and structural sensitivity.
Lock-in detector for accelerated nonlinear imaging
Authors: Purz Torben L. , Cundiff Steven T. , Martin Eric W.
Published: August 2022

We present a lock-in amplification scheme allowing an order of magnitude reduction of data acquisition time for nonlinear imaging applications in materials science, biology, and medicine, including four-wave mixing and stimulated Raman scattering imaging.
3D Virtual Refocusing of Point Spread Function (PSF) Engineered Images Using Cascaded Neural Networks
Authors: Yang Xilin , Huang Luzhe , Luo Yilin , Wu Yichen , Wang Hongda , Rivenson Yair , Ozcan Aydogan
Published: August 2022

We present a virtual refocusing method over an extended depth-of-field (DOF) using point-spread function (PSF) engineering and cascaded deep neural networks.
Colorimetric Metasurfaces for Quantitative, On-Chip Tissue Diagnostics
Authors: Poulikakos L. V. , Bordy S. , Byun J. , Haddadin Z. , Kirya P. , Khan S. , Kim D. Y. , Hochberg J. , Pokorski J. K. , Lawrence M. , Barton D. R. , Jeffrey S. S. , Dionne J. A.
Published: August 2022

We leverage the unique properties of anisotropic, colorimetric metasurfaces to selectively visualize disease-relevant fiber density and orientation in biological tissue, paving the way toward rapid, precise and low-cost diagnostics ranging from cancer to neurodegenerative disease.
Frequency interleaving dual comb photonic ADC with 7 bits ENOB up to 40 GHz
Authors: Deakin Callum , Liu Zhixin
Published: August 2022

We demonstrate a record high performance of frequency-interleaved analog-to-digital conversion using a phase-noise-engineered dual frequency comb photonic technique, enabling 7 effective number of bits (ENOB) for signals up to 40 GHz.
Flexible Time-Domain De-Multiplexing of Nyquist OTDM Channels by Orthogonal Sampling in Silicon Photonics
Authors: Misra Arijit , Singh Karanveer , Meier Janosch , Kress Christian , Schwabe Tobias , Preussler Stefan , Scheytt J. Christoph , Schneider Thomas
Published: August 2022

We report for the first time, inter-symbol-interference (ISI) free demultiplexing of Nyquist optical time division multiplexed (OTDM) signals using a reconfigurable orthogonal sinc-pulse sampling enabled by silicon photonic Mach-Zehnder Modulators.
Photonic-Eletronic Arbitrary Waveform Generation up to 100 GHz Using Active Phase Stabilization
Authors: Füllner C. , Sherifaj A. , Henauer T. , Fang D. , Drayss D. , Harter T. , Gutema T. Z. , Freude W. , Randel S. , Koos C.
Published: August 2022

We demonstrate photonic-electronic ultra-broadband arbitrary waveform generation based on coherent reception of IQ signals and active phase stabilization. We show the viability of our concept by generating OOK and PAM4 data signals at symbol rates up to 200 GBd.
Wavelength Conversion of a 36 Gb/s Net Rate PAM-4 Signal Using an a-Si Waveguide
Authors: Girouard Peter , Xu Xiaoyu , Lillieholm Mads , Frandsen Lars H. , Gutt Lars Emil , Galili Michael , Oxenløwe Leif K. , Guan Pengyu
Published: August 2022

Wavelength conversion of a net rate 36 Gb/s PAM-4 signal is achieved using an amorphous silicon waveguide with less than 23 dBm of pump power, enabled by over 13 dB improvement in the output-to-input conversion efficiency.
Amplitude regeneration and phase noise suppression of an 8-PSK signal by an attenuation-imbalanced NOLM
Authors: Guo Cheng , Vasilyev Michael , Lakoba Taras I.
Published: August 2022

We demonstrate nonlinear phase noise suppression for a 50%-duty-cycle RZ 8-PSK signal by a nonlinear-optical loop mirror (NOLM). Using NOLM prior to a 25-km-long nonlinear transmission link improves Q-factor by 2.3dB and EVM by 5.2%.
Remote comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link
Authors: Yang Jaewon , Lee Dong IL , Shin Dong-Chel , Lee Jaehyun , Kim Young-Jin , Kim Seung-Woo
Published: August 2022

We perform comb-to-comb stabilization through a 1.3-km free-space optical link. The achieved frequency stability is 1.22×10−15 at 1.0 s integration over the entire comb spectrum.
Extreme-Timing-Resolution with Waveguide-Based Balanced Optical Cross-Correlators
Authors: Şafak Kemal , Dai Anan , Xin Ming , Battle Philip , Roberts Tony D. , Hawthorne Todd , Kärtner Franz X.
Published: August 2022

We report a balanced optical cross-correlator based on PPKTP waveguides with sub-attosecond noise floor and more than 100 times higher timing sensitivity when compared to similar bulk optic detectors.
Sampling timing jitter in dispersion-managed frequency microcombs via a fiber interferometer
Authors: Wang Wenting , Liu Hao , Melton Tristan , Yang Jinghui , Vinod Abhinav Kumar , Lim Jinkang , Jang Yoon-Soo , Zhou Heng , Yu Mingbin , Kwong Dim-Lee , DeVore Peter , Chou Jason , Wong Chee Wei
Published: August 2022

We characterized timing jitter of dispersion-managed frequency microcomb with femtosecond timing resolution through fiber interferometry for the first time. The measured timing jitter PSD and integrated timing jitter are 0.4 as2/Hz and 1.7 fs.
Dissipative Kerr soliton induced by intermodal cascaded stimulated Brillouin scattering in graded-index multimode fiber Fabry-Pérot microresonators
Authors: Nie Mingming , Huang Shu-Wei
Published: August 2022

We demonstrate the first intermodal cascaded SBS up to three orders and corresponding Brillouin-Kerr soliton microcombs in a multimode fiber FP microresonator, along with the coexisting Raman combs and Turing pattern for the pump mode.
Thermal control of Kerr microresonator soliton comb via an optical sideband
Authors: Nishimoto Kenji , Minoshima Kaoru , Yasui Takeshi , Kuse Naoya
Published: August 2022

We demonstrate the thermal control of a microresonator soliton comb via an optical sideband, in which the detuning is passively fixed, enabling the robust and frequency-tunable soliton comb as well as the phase noise reduction.
Fano Laser Based on a Photonic Crystal Nanobeam Cavity
Authors: Dong Gaoneng , Xiong Meng , Dimopoulos Evangelos , Sakanas Aurimas , Semenova Elizaveta , Yvind Kresten , Yu Yi , Mork Jesper
Published: August 2022

We experimentally demonstrate a Fano laser based on an InP-on-silicon photonic crystal nanobeam cavity, which can overcome limitations faced by two-dimensional photonic crystal structures.
Narrow-Linewidth Fano Laser
Authors: Yu Yi , Sakanas Aurimas , Semenova Elizaveta , Yvind Kresten , Mørk Jesper
Published: August 2022

By exploiting Fano resonances, a microscopic laser with a linewidth >20 times smaller than previous microscopic lasers is experimentally demonstrated. We also show that the linewidth can be further improved by engineering the Fano lineshape.
Scalable Optical Control for Atomic Qubits in a Silicon Nitride Platform
Authors: Menssen Adrian , Hermans Artur , Christen Ian , Dong Mark , Zimmermann Matthew , Leenheer Andrew J. , Propson Thomas , Larocque Hugo , Gilbert Gerald , Eichenfield Matt , Englund Dirk
Published: August 2022

Here we present a new integrated photonics platform for optical quantum control that allows the generation of multiple high fidelity optical pulses to implement quantum gates on individual atomic qubits at speeds exceeding several hundred MHz.
Non-magnetic Optical Isolator for Telecom based on Atomic Cladding Waveguide
Authors: Sher Ilan , Zektzer Roy , Barash Yefim , Levy Uriel
Published: August 2022

In this work we present chip scale nonmagnetic optical isolator in the telecom regime. The nonreciprocity is realized by Doppler shift resulting from the velocity selective optical pumping of warm Rubidium atoms in ladder scheme.
High-Yield Heterogeneous Integration of Silicon and Lithium Niobate Thin Films
Authors: Cuyvers Stijn , Vanackere Tom , Vandekerckhove Tom , Poelman Stijn , de Beeck Camiel Op , De Witte Jasper , Hermans Artur , Van Gasse Kasper , Picqué Nathalie , Van Thourhout Dries , Roelkens Gunther , Clemmen Stéphane , Kuyken Bart
Published: August 2022

Microtransfer printing of silicon and lithium niobate thin films on generic integrated photonic platforms is demonstrated. An unprecedented integration yield is achieved using crack barriers as a way to mitigate stress-induced shears in the material.
Heterogeneously integrated lithium niobate photonics
Authors: Churaev Mikhail , Riedhauser Annina , Wang Rui N. , Möhl Charles , Blésin Terence , Anderson Miles A. , Snigirev Viacheslav , Siddharth Anat , Popoff Youri , Drechsler Ute , Caimi Daniele , Hönl Simon , Riemensberger Johann , Liu Junqiu , Seidler Paul , Kippenberg Tobias J.
Published: August 2022

We demonstrate a hybrid LiNbO3-Si3N4 photonic integrated platform with propagation loss of 8.5 dB/m at wafer scale. The platform low insertion loss (4 dB) and precise lithographic control. We also demonstrate a number of applications of the platform.
Ultralow-loss etchless lithium niobate integrated photonics at near-visible wavelengths
Authors: Yu Yue , Yu Zejie , Wang Lai , Sun Xiankai
Published: August 2022

We developed an ultralow-loss etchless lithium niobate integrated photonic platform at near-visible wavelengths (765–781 nm) and experimentally achieved a maximal intrinsic Q factor of 1.1 × 106 in disk microcavities at ~765 nm.
Second-harmonic generation in etchless lithium niobate nanophotonic waveguides with bound states in the continuum
Authors: Ye Fan , Yu Yue , Xi Xiang , Sun Xiankai
Published: August 2022

We experimentally demonstrated second-harmonic generation from telecom to near-visible wavelengths on an etchless lithium niobate platform by using a photonic bound state in the continuum for the second-harmonic mode.
Direct Optical Vortex Laser Printing of a Microdot with Close-Packed and Sintered Gold Nanoparticles
Authors: Kawaguchi Haruki , Wei Rong , Yamane Keisaku , Yuyama Ken-ichi , Kawano Satoyuki , Morita Ryuji , Toyoda Kohei , Miyamoto Katsuhiko , Omatsu Takashige
Published: August 2022

We demonstrate the direct printing of an ultrafine microdot formed of gold nanoparticles by employing optical vortex laser induced forward transfer. Spin and orbital angular momentum induces the close-packing and sintering of gold nanoparticles.
Reconfigurable meta-pixels using low-loss optical phase-change materials
Authors: Abdollahramezani Sajjad , Adibi Ali
Published: August 2022

We experimentally demonstrate high-resolution, high-saturation, wide-gamut, dynamic, and electrically switchable color meta-pixels by leveraging a newly emerged class of low-loss optical phase-change materials enabling multiplexed image encryption in the state of polarization and material phase.
Towards Continuous Wave, Single Mode, Surface-Emitting Laser at 24µm
Authors: Olariu Tudor , Beck Mattias , Scalari Giacomo , Faist Jérôme
Published: August 2022

A surface emitting, single mode laser at 24µm is presented, based on InGaAs/AlInAs system. Processed into a metal-metal device and employing planarization technology, heat dissipation can be improved on the way to continuous wave operation.
Time-Stamping of Ultrafast Electron Probes Using Terahertz Radiation
Authors: Othman M. A. K. , Gabriel A. E. , Kramer P. , Shen X. , England J. , Hoffmann M. C. , Nanni E. A.
Published: August 2022

We show a method for detection and correction of the time-of-arrival jitter of electron bunches generated from an rf photoeinjector through Terahertz time-stamping, subsequently improving the temporal resolution of pump-probe UED measurements.
Ultrafast Multidimensional Spectroscopy with Phase Sensitivity at Multi-THz Frequencies
Authors: Deckert Thomas , Allerbeck Jonas , Kurihara Takayuki , Brida Daniele
Published: August 2022

Noncollinear two-dimensional terahertz spectroscopy enables phase-sensitive investigation of coherent low-energy dynamics in semiconductors and strongly correlated materials in a perturbative excitation regime. A strong nonlinear response in indium antimonide reveals the ultrafast dynamic bandgap renormalization.
Physical modeling of the permittivity of in vivo burn injuries using Debye dielectric parameters measured by the THz PHASR scanner
Authors: Khani Mahmoud E. , Harris Zachery B. , Osman Omar B. , Zhou Juin W. , Chen Andrew , Arbab M. Hassan
Published: August 2022

We report on measuring the permittivity of in vivo burn injuries in a swine model using our new PHASR scanner and show that the extracted Debye parameters can differentiate between grades of burn injuries accurately (p < 0.05).
THz Quantum Cascade Laser Frequency Combs based on Planarized Waveguides
Authors: Senica Urban , Olariu Tudor , Forrer Andres , Micheletti Paolo , Beck Mattias , Faist Jérôme , Scalari Giacomo
Published: August 2022

We present a planarized double metal waveguide platform for THz quantum cascade laser frequency combs with a wide top metallization, extending above the surrounding low-loss BCB polymer. Compared to a standard double metal waveguide, improvements in waveguide losses, RF and thermal properties are observed. Tapered waveguide devices display a field-enhancing effect, improving comb performance due to the enhanced four wave mixing process. These devices feature strong free-running beatnotes up to nearly -30 dBm and comb operation at high temperatures up to 115 K in continuous wave.
High Energy Diode-Pumped Tm:YLF Amplifier
Authors: Tamer Issa , Reagan Brendan A. , Galvin Thomas , Galbraith Justin , Sistrunk Emily , Church Andrew , Huete Glenn , Neurath Hansel , Willard Drew , Spinka Thomas
Published: August 2022

We report on the first multi-joule-level Tm:YLF amplifier. In this experimental setup, a Tm:YLF oscillator seeds a 4-pass diode-pumped Tm:YLF amplifier, producing output energies of 3.88J in 20ns and up to 38.1J in long-pulse operation.
100 W Dual-Output Thin Disk Laser for Picosecond OPCPA Pumping
Authors: Erdman Emily C. , Novák Jakub , Antipenkov Roman , Horáček Martin , Indra Lukáš. , Tykalewicz Boguslaw , Torun Murat , Mazůrek Petr , Naylon Jack A. , Bakule Pavel , Rus Bedřich
Published: August 2022

Thin disk regenerative amplifiers have suitable characteristics to pump picosecond OPCPA. By optimizing the trigger pulse to the MZM, a dual-output laser operating at 100 W, 1 kHz repetition rate, compressed to the transform limit is reported.
Nd:Phosphate Split-slab Liquid Cooled kJ Amplifier for High Power Laser at 1 Shot/Minute
Authors: Dalbiès P.M. , Blanchot N. , Bordenave E. , Cavaro S. , Le Palud F. , Lupi J.F. , Moreau J. , Neauport J.
Published: August 2022

A liquid cooled Nd:Phosphate split-disk amplifier, operating at 1053nm and one shot/min, was designed and built. Good wavefront quality is obtained, in agreement with multi-physics modeling and with performance needs on high power laser systems.
Advantages of YLF host over YAG in power scaling of ytterbium based lasers at cryogenic temperatures
Authors: Demirbas Umit , Kellert Martin , Thesinga Jelto , Reuter Simon , Kärtner Franz X. , Pergament Mikhail
Published: August 2022

Our spectroscopic, lasing and thermal-lens measurements performed with Yb:YLF and Yb:YAG under almost identical conditions show that YLF host has several advantages over YAG for the development of high-power ultrafast laser/amplifier systems at cryogenic temperatures.
All-Optical Spatial Beam Switching in Multimode Fibers
Authors: Leventoux Yann , Ferraro Mario , Mangini Fabio , Zitelli Mario , Sun Yifan , Fevrier Sebastien , Tonello Alessandro , Krupa Katarzyna , Wabnitz Stefan , Couderc Vincent
Published: August 2022

We propose and experimentally demonstrate a novel approach to spatial all-optical switching, based on beam self-cleaning in nonlinear graded-index multimode opti-cal fibers.
Observation of Light Self-Organization and Mode Attraction in a Multimode Optical Fiber
Authors: Jain Saurabh , Ji Kunhao , Núñez-Velázquez Martin Miguel Angel , Davidson Ian , Sahu Jayanta , Fatome Julien , Richardson David. J. , Wabnitz Stefan , Guasoni Massimiliano
Published: August 2022

We present the first-ever quantitative analysis of mode attraction in a multimode fiber with a counter-propagative setup, as well as an overview of novel self-organization processes.
3D multiphoton characterization of χ(2) nonlinearity induced in a multimode fiber through optical poling
Authors: Jonard Maxime , Leventoux Yann , Colas Maggy , Février Sébastien , Mansuryan Tigran , Cornette Julie , Tonello Alessandro , Krupa Katarzyna , Duclère Jean-René , Lefort Claire
Published: August 2022

We characterize the 3D spatial distribution of the quadratic susceptibility in an optically poled graded-index multimode fiber in presence of spatial beam self-cleaning. We also show how the poling process can improve the beam self-cleaning.
Generation of Tunable, Picosecond Pulses from a MEMS-VCSEL
Authors: Uyehara Elise , Ram Rajeev J. , Burgner Christopher , Jayaraman Vijay
Published: August 2022

We demonstrate sub-170ps pulse generation from electrically gain-switched MEMS-VCSELs that are continuously tunable from 833-848nm. This compact, tunable picosecond pulse source is well-suited to optical coherence tomography, high resolution laser spectroscopy and light ranging applications.
Single-mode 1060nm Bottom Emitting Metal Aperture VCSEL Array for Co-packaged Optics
Authors: Ibrahim Hameeda R , Gu Xiodong , Hassan Ahmed M. A. , Shinada Satoshi , Ahmed Moustafa , Koyama Fumio
Published: August 2022

We present a bottom emitting 1060nm intracavity metal-aperture VCSELs array for co-packed optics. The metal-aperture provides the modulation bandwidth-enhancement and single-mode operation. We demonstrated 60Gbps PAM4 and 46Gbps NRZ for 16-ch bottom emitting array.
Electrically-driven 2D multi-beam steering with large field of view by using VCSEL scanner array
Authors: Li Ruixiao , Hu Shanting , Gu Xiaodong , Shinada Satoshi , Koyama Fumio
Published: August 2022

We demonstrate electrically driven 2D beam scanner for solid-state LiDARs by fabricating VCSEL scanner array and using simply stacked optics. A large field of view of 70° × 45° and record resolution of 33,000 were realized.
On-Chip Quantum Devices Enabled by Shallow-Implanted Vacancy Centers in Laser-Written Waveguides in Diamond
Authors: Hoese Michael , Koch Michael K. , Bharadwaj Vibhav , Lang Johannes , Ramponi Roberta , Jelezko Fedor , Eaton Shane M. , Kubanek Alexander
Published: August 2022

We present a quantum device platform enabled by shallow implanted vacancy centers in the front facet of laser-written waveguides in diamond. Two proof-of-principle experiments highlight the potential for quantum sensing and single photon light-field engineering.
High-resolution and High-Contrast Imaging of Defects in a Crystal
Authors: Moon Jong Sung , Lee Haneul , Lee Jin Hee , Jeon Woong Bae , Lee Dowon , Lee Junghyun , Paik Seoyoung , Han Sang-Wook , Reuter Rolf , Denisenko Andrej , Wrachtrup Jörg , Lee Sang-Yun , Kim Je-Hyung
Published: August 2022

Optically active color centers in crystals provide important building blocks for quantum applications. However, conventional confocal fluorescence microscopy of high-refractive-index crystals suffers from limited photon collection efficiency and spatial resolution. Here, we demonstrate high-resolution, high-contrast imaging of defects in diamonds using microsphere-assisted confocal microscopy. A microsphere provides an excellent optical interface for point defects with a magnified virtual image that increases the spatial resolution up to λ/5, as well as the optical signal-to-noise ratio by four times.
Suspended Waveguide for Mechanical Driving of Color Centers in Diamond
Authors: Ding Sophie W. , Cornell Eliza , Shao Linbo , Pingault Benjamin , Sinclair Neil , Lončar Marko
Published: August 2022

We demonstrate the transmission of a ∼4-GHz surface acoustic wave across a suspended diamond waveguide. This enables simultaneous coherent mechanical driving of, and optical access to, diamond-based color centers.
A low-power PZT stress-optic Si3N4 micro-ring modulator for PDH locking applications
Authors: Wang Jiawei , Liu Kaikai , Harrington Mark W. , Rudy Ryan Q. , Blumenthal Daniel J.
Published: August 2022

A low power, PZT stress-optic Si3N4 micro-ring modulator, with Q = 7 million and a 20 MHz 3-dB bandwidth is demonstrated as an amplitude modulator in a PDH laser stabilization lock loop.
Evolution of optical vortices from deterministic to random fields
Authors: Eshaghi Mahdi , Acevedo Cristian Hernando , Dogariu Aristide
Published: August 2022

Upon interaction with inhomogeneous media, high-order optical vortices divide into canonical ones which diffuse away from the optical axis. We demonstrate how this dynamic process depends on both the topological charge and the interaction strength.
Jamming Attacks at Terahertz Frequencies
Authors: Shrestha Rabi , Guerboukha Hichem , Fang Zhaoji , Knightly Edward , Mittleman Daniel M.
Published: August 2022

We demonstrate the vulnerability of a 200 GHz wireless link to a jamming attack and show how a jammer can exploit the broadband nature of typical receivers to reduce the target signal’s BER.
Broadband Terahertz Signal Processing and Multiplexing with Four-wire Waveguides
Authors: Dong Junliang , Tomasino Alessandro , Balistreri Giacomo , You Pei , Vorobiov Anton , Yurtsever Aycan , Stivala Salvatore , Vincenti Maria A. , De Angelis Costantino , Kip Detlef , Azaña José , Morandotti Roberto
Published: August 2022

We demonstrate a new waveguide geometry, namely a four-wire waveguide, which acts as a terahertz polarization-division multiplexer and a novel platform to realize versatile signal-processing functionalities into independent channels over a broadband terahertz frequency range.
PAM4 wireless communication in 300 GHz-band using integrated-optic PAM signal emulator
Authors: Takiguchi Koichi
Published: August 2022

We report on 25 Gbaud PAM4 communication in the 300 GHz-band, which employs an integrated-optic PAM signal emulator with a tunable asymmetric Mach-Zehnder interferometer configuration. We did not adopt special signal processing or coherent detection.
Demonstration of a Cross-Thin-Slab Amplifier for High Peak and Average Power Ti:Sa Laser Systems
Authors: Chvykov Vladimir , Chi Han , Wang Yong , Berrill Mark , Rocca Jorge
Published: August 2022

A room temperature Ti:Sa amplifier based on a cross pump-seed geometry was demonstrated to generate 25mJ at 1 kHz, pumped when pumped by 100 mJ from an Yb:YAG laser. The amplifier geometry maintains the crystal temperature at~ 300 C.
Self-seeded XFEL for Science Applications
Authors: Kang Heung-Sik , Nam Inhyuk , Min Chang-Ki , Ma Rory
Published: August 2022

PAL-XFEL achieved the highest spectral intensity of XFEL using the self-seeding scheme. We demonstrated that the self-seeded FEL with higher reproducibility and cleaner spectrum enables a superior multiplicity of data to the SASE FEL for the serial femtosecond crystallography. Time-resolved X-ray absorption spectroscopy using the self-seeded FEL is under study. Comments and questions should be directed to the Optica Conference Papers staff (tel: +1 202.416.6191, e-mail: cstech@optica.org).
Ultra-Narrow-Linewidth Lasers for Quantum Applications
Authors: Lai Yu-Hung , Amili Abdelkrim El , Eliyahu Danny , Moss Robert , Ganji Setareh , Singer Scott , Maleki Lute
Published: August 2022

We present an ultra-narrow-linewidth laser designed based on optical self-injection locking to a miniaturized whispering gallery mode resonator. The measured instantaneous linewidth of the laser is at sub-Hertz-level, making it suitable for precise energy-level excitation in quantum technology applications.
Quantum Enhanced LIDAR using Nonlocal Dispersion
Authors: Blakey Phillip S. , Liu Han , Papangelakis G. , Iu M. L. , Zhang Y. , Léger Z. M. , Helmy Amr S.
Published: August 2022

By utilizing quantum temporal correlations in spontaneous parametric down conversion photon pairs, in conjunction with non-local dispersion, we can achieve 35.94 ± 0.91dB improvement in SNR over classical LIDAR.
Optical Clocks with Trapped Ions: Atomic and Nuclear Clocks
Authors: Peik Ekkehard
Published: August 2022

Progress on optical clocks with laser cooled trapped ions is presented with a focus on two systems that both possess small systematic uncertainties and a high sensitivity in fundamental tests: The 171Yb+ ion with an E3 transition and the 229Th3+ ion with a low-energy nuclear transition.
Rack-Mounted Ultrastable Laser System for Sr Lattice Clock Operation
Authors: Brekenfeld Manuel , Rauf Benjamin , Saint-Jalm Sarah , Cole Garrett D. , Truong Gar-Wing , Lessing Maurice , Fricke Andreas , Fischer Marc , Giunta Michele , Holzwarth Ronald
Published: August 2022

We present a rack-mounted ultra-low-noise laser system for Sr lattice clocks, with spectral purity transfer stability of 4×10−18@1s and 2×10−19@100s. We realize a system stability of 5×10-16@1s, representing state-of-the-art performance for rack-mounted commercial systems.
High-dimensional Stokes-space spatial beam analyzer
Authors: Dahl Daniel S. , Plöschner Martin , Mounaix Mickael , Fontaine Nicolas K. , Carpenter Joel
Published: August 2022

We demonstrate a device for measuring the generalized Stokes parameters of a six spatial mode beam. The device is a single-shot wavefront sensor measuring spatial complex amplitude and coherence without an external phase reference.
Fiber Based Generic Photonic Computing Unit
Authors: Yevnin Maya , Cohen Eyal , Yanir Tomer , Zalevsky Zeev
Published: August 2022

We present a fiber-based photonic computing concept and system which rely on incoherent data encoding and scalable architecture. Our results suggest projected performance of >1,000,000 Tera operations per second (TOPs) and efficiency of >1000 TOPs/Watt.
Imaging through Disordered Optical Fiber System Using Unsupervised Learning
Authors: Hu Xiaowen , Zhao Jian , Antonio-Lopez Jose Enrique , Correa Rodrigo Amezcua , Schülzgen Axel
Published: August 2022

Because of the excellent light guidance provided by transverse Anderson localization, unsupervised learning is sufficient for high-fidelity cell imaging through disordered fibers. A multi-step image recovery process, including standardization and generative adversarial networks, is presented.
Recurrent Neural Network Equalizer to Extend Input Power Dynamic Range of SOA in 100Gb/s/λ PON
Authors: Murphy Stephen , Townsend Paul D. , Antony Cleitus
Published: August 2022

We propose a novel equalization scheme for 100Gb/s/λ PAM4 PON based on Gated Recurrent Neural Network to increase SOA preamplifier input power dynamic range tolerance to 30 dB below hard-decision FEC BER limit of 3.8×10−3.
Experimental Demonstration of a Constellation Shaped via Deep Learning and Robust to Residual-Phase-Noise
Authors: Guan Xun , Omidi Amir , Zeng Ming , Rusch Leslie Ann
Published: August 2022

We propose a deep-learning-based geometric constellation shaping algorithm for resisting the residual laser phase noise. In experiment, the proposed scheme outperforms 16QAM by 5.3 dB and non-deep-learning constellation shaping by 1.8 dB in OSNR.
Multiparameter Monitoring of PAM4 Signals Using Deep Learning
Authors: Li Si-Ao , Liu Yuanpeng , Zhang Yiwen , Zhao Wenqian , Shi Tongying , Han Xiao , Djordjevic Ivan B. , Ren Yongxiong , Bao Changjing , Pan Zhongqi , Yue Yang
Published: August 2022

PAM4 signal performance monitoring is demonstrated using CNN-based deep learning. A 98.51% prediction accuracy is achieved for jointly monitoring multiple parameters including baud rate, probabilistic shaping, roll-off factor, optical signal-to-noise ratio, and chromatic dispersion.
Generation of Spatial Combs Digitized by Orbital Angular Momentum
Authors: Shahar Daniel , Ramachandran Siddharth
Published: August 2022

We generate a spatial comb comprising a superposition of a record 51 orbital angular momentum modes with a flat spectrum. This is a first step towards versatile digital control of the spatial shape of light.
Dark-Bright Soliton Frequency Combs in a Microresonator
Authors: Zhang Shuangyou , Bi Toby , Ghalanos George N. , Moroney Niall P. , Bino Leonardo Del , Del’Haye Pascal
Published: August 2022

We demonstrate mutually trapped dark-bright-soliton pairs in microresonators. The solitons are generated by seeding modes in different dispersion regimes with similar group velocity. Dark-bright-soliton pairs enable frequency combs with nearly constant power in time domain.
Continuous Wave Operation of Terahertz Metasurface Quantum-cascade VECSEL with a Long Intra-cryostat Cavity
Authors: Wu Yu , Curwen Christopher , Reno John L. , Williams Benjamin
Published: August 2022

An off-axis paraboloid mirror is introduced into the intra-cryostat quantum-cascade VECSEL cavity as a focusing element to reduce the diffraction loss. Continuous-wave lasing at 3.4 THz is obtained with a cavity length ~27 mm.
Observation of intersubband polaritonic coupling in a quantum-cascade metasurface
Authors: Shen Yue , Kim Anthony D. , Shahili Mohammad , Curwen Christopher A. , Addamane Sadhvikas , Reno John L. , Williams Benjamin S.
Published: August 2022

An amplifying quantum-cascade (QC) metasurface – the key component of the QC vertical-external-cavity surface-emitting-laser (VECSEL) – is studied as a function of current density using reflection-mode terahertz time domain spectroscopy. Nearly perfect absorption and an anomalous reflection phase characteristic is measured at zero bias, which disappears as the device is biased to provide gain. This is attributed to critical coupling between a lossy intersubband transition within the active material and the metasurface resonance. These results provide insight into the interaction between the intersubband QC-gain material and the metasurface and modify the design rules for QC-VECSELs for both biased and unbiased regions.
Active Beam Steering of Terahertz Waves with Phase Change-based Metasurfaces
Authors: Yahiaoui Riad , Chase Zizwe A. , Huang Zhixiang , Wang Xi , Searles Thomas A.
Published: August 2022

We demonstrate active control of THz beams with a phase change material, VO2, patterned into a metasurface microcavity. We experimentally confirm simulations showing up to 35 degree deflection at 300 GHz.
Diffraction-free propagation of terahertz spoof surface plasmon polaritons on metasurfaces with hyperbolic dispersion
Authors: Becker Sven , Walla Frederik , Roskos Hartmut G. , Rahm Marco
Published: August 2022

We report the implementation of metasurfaces with hyperbolic dispersion that route propagating terahertz spoof surface-plasmon polaritons on highly confined, almost diffraction-free signal paths. We also tuned their propagation angle by adjusting the hyperbolic isofrequency contour.
Nonlinear Terahertz Photonics with Quantum Materials
Authors: Tielrooij Klaas-Jan
Published: August 2022

It has recently become evident that quantum materials with massless Dirac fermions have extremely strong terahertz nonlinearities. This talk will show how these can be enhanced even further, with interesting prospects for applications.
Multimode Quantum Correlations of Soliton Microcombs in Silicon Carbide Microrings
Authors: Guidry Melissa A. , Lukin Daniil M. , Yang Ki Youl , Trivedi Rahul , Vučković Jelena
Published: August 2022

We generate soliton microcombs in silicon-carbide-on-insulator microrings with a minimum operation power of 2.3 mW in the input waveguide. Using a single-photon optical spectrum analyzer, we study the multimode quantum correlations of soliton micro-combs.
Spontaneous photon pair generation at the nanoscale
Authors: Weissflog Maximilian A. , Dezert Romain , Vinel Vincent , Saravi Sina , Borne Adrien , Pertsch Thomas , Setzpfandt Frank , Leo Giuseppe
Published: August 2022

Subwavelength resonators have recently emerged as promising sources of spontaneous parametric down-conversion. By modeling them with quasi-normal mode expansion, we reveal a nonlinear multimode interaction and assist the design of efficient metasurfaces for quantum technologies.
Towards Lower Repetition Rate and Visible Wavelength Microresonator Frequency Combs for Optical Atomic Clocks
Authors: Moille Grégory , Westly Daron , Simelgor Gregory , Srinivasan Kartik
Published: August 2022

Microresonator frequency combs that service optical atomic clocks must exhibit octave bandwidth, detectable repetition rate, and wavelengths compatible with advanced atomic references. We present recent progress towards realizing such microcombs for Sr lattice optical cocks.
Octave-spanning Kerr solitons with repetition rates of 1, 2, and 3 THz in a Si3N4 microresonator
Authors: Weng Haizhong , Afridi Adnan , Li Jing , McDermott Michael , Tu Huilan , Lu Qiaoyin , Guo Weihua , Donegan John F.
Published: August 2022

Octave-spanning single-soliton and soliton crystals with repetition rates of 1, 2, and 3 THz are demonstrated in a Si3N4 microresonator. A single-soliton step with ~0.09 nm (~11 GHz) is achieved using slow pump tuning.
Towards Compact Hollow-Core Fiber Gas Cells
Authors: Suslov Dmytro , Kelly Thomas William , Rikimi Shuichiro , Zhong Ailing , Taranta Austin , Zvánovec Stanislav , Poletti Francesco , Richardson David J. , Komanec Matěj , Wheeler Natalie , Slavík Radan
Published: August 2022

We demonstrate a 3-way interconnection device (hollow-core fiber, standard single-mode fiber and gas inlet) that is compact, low-loss, and easy-to-use. We demonstrate its performance on fibre purging, observing water vapor via infrared spectroscopy.
Hollow-Core Fiber Based Inline Polarizer
Authors: Goel Charu , Zang Jichao , Rosdi Muhammad Abu Bin , Chang Wonkeun , Yoo Seongwoo
Published: August 2022

We experimentally demonstrate the first compact antiresonant hollow-core fiber based inline polarizer. The device offers >25 dB polarization extinction ratio and <1.5 dB insertion loss when fusion spliced to mode-matched solid and hollow-core fibers.
Kilowatt-peak-power Green Pulse Delivery over Hundred-meter Scale Lengths of Hollow-Core Fiber
Authors: Fu Q. , Davidson I. A. , Mousavi S. A. , Xu L. , Wheeler N. V. , Poletti F. , Richardson D. J.
Published: August 2022

We report on the delivery of kilowatt-peak-power and watt-average-power green laser pulses through single-ring hollow-core fibers up to 300-m-long. The delivered beams are near-diffraction limited with M2 factor <1.1.