bluuebunny/crossref_metadata_2025 huggingface dataset:
Advances in fiber-based time-delay reservoir computing
Authors: Argyris Apostolos , Fischer Ingo
Published: August 2021

Here we present the recent advances of time-delay reservoir computing systems, built with standard fiber optic components and applied to the post-detection processing of optical communication signals.
Multi-Wavelength, Multi-Level Inputs for an All-Optical SOA-Based Neuron
Authors: Shi Bin , Pan Bitao , Calabretta Nicola , Stabile Ripalta
Published: August 2021

We demonstrate the first optical processing of up to 9-bit/symbol multi-level modulated channels on a complete all-optical SOA-based neuron, with an error of 0.08. A higher number of modulation levels and inputs can improve accuracy.
Key Update using Y-00 Quantum Noise Stream Cipher with 20-bit Intensity Levels in a 1,000-km Optical Fiber Link
Authors: Futami Fumio , Tanizawa Ken
Published: August 2021

We demonstrate simultaneous intensity-modulated Y-00 cipher transmission of a private key at 200 kb/s and 1.5-Gb/s data over 1,000 km fiber. Highly secure key transmission with 1,048,576 (=220) intensity levels and key update are achieved.
Multispectrum Rotational States Distribution Thermometry
Authors: Gotti R. , Lamperti M. , Gatti D. , Wojtewicz S. , Puppe T. , Mayzlin Y. , Alsaif B. , Robinson-Tait J. , Rohde F. , Wilk R. , Leisching P. , Kaenders W.G. , Laporta P. , Marangoni M.
Published: August 2021

We exploit a widely tunable comb-locked frequency-swept synthesizer to test a new optical approach to primary gas thermometry based on a global fitting of multiple molecular absorption lines of the same band at different pressures.
Comb-referenced Stimulated Raman Spectrometer: Application to the Collisional Physics of H2
Authors: Lamperti Marco , Rutkowski Lucile , Ronchetti Daniele , Gatti Davide , Gotti Riccardo , Cerullo Giulio , Thibault Franck , Jóźwiak Hubert , Wójtewicz Szymon , Masłowski Piotr , Wcisło Piotr , Polli Dario , Marangoni Marco
Published: August 2021

H2 is a benchmark system for fundamental physics, yet spectroscopy is hindered by the lack of dipole moment. We present a comb-calibrated coherent Raman spectrometer for advanced studies of the collisional physics of the molecule.
Bending modes metrology in the 12-15 µm region
Authors: Lamperti M. , Gotti R. , Gatti D. , Shakfa M. K. , Cané E. , Tamassia F. , Schunemann P. , Laporta P. , Farooq A. , Marangoni M.
Published: August 2021

Bending modes metrology through a comb-referenced widely tunable nonlinear laser source is demonstrated. We report center frequencies of CO2 lines determined with 30 kHz uncertainty and an extensive study of the n11 band of benzene.
High Performance Silicon Waveguide Photodetector at Communication Wavelengths by Deep Cooling
Authors: Zhao Xingyan , Dan Yaping
Published: August 2021

A novel deep cooling process was applied to treat Er/O doped silicon waveguide photodiodes. Compared with RTA process, the deep cooling process leads to an enhanced photoresponsivity to 12 mA/W at 1510 nm.
Triple-Mesa InGaAs/InAlAs Single-Photon Avalanche Diode Array for 1550 nm Photon Detection
Authors: Zhang Jishen , Wang Haibo , Zhang Gong , Xu Haiwen , Tan Kian Hua , Wicaksono Satrio , Wang Chao , Ren Tianhua , Sun Chen , Chen Yue , Liang Yan , Lim Charles Ci Wen , Yoon Soon-Fatt , Gong Xiao
Published: August 2021

We present a novel InGaAs/InAlAs single-photon avalanche diodes array with a triple- mesa structure. High photon detection efficiency of 36% with decent dark count rate of 1.9×107 Hz is achieved at 240 K.
All-Fiber Wavelength-Switchable Orbital Angular Momentum (OAM) Laser Assisted by Fiber Bragg Grating and Fabry-Perot Interferometer Directly Inscribed in Erbium-Doped Fiber with Femtosecond Laser
Authors: Cui Feng , Liu Jun , Wang Jue , Cai Chengkun , Li Wei , Du Cheng , Wang Jian
Published: August 2021

We demonstrate an all-fiber wavelength-switchable orbital angular momentum (OAM) laser assisted by fiber Bragg grating (FBG) and Fabry-Perot interferometer (FPI), which are directly inscribed by femtosecond laser in ring-core erbium-doped fiber.
Simultaneous detection of distance and velocity via asymmetric carrier-suppressed double sideband modulation with a Kerr-microresonator soliton comb
Authors: Kitora Hiroki , Yasui Takeshi , Minoshima Kaoru , Kuse Naoya
Published: August 2021

We propose and demonstrate a new LiDAR technique with the capability of the simultaneous measurement of distance and velocity, in which an asymmetric carrier-suppressed double sideband modulation is applied to a Kerr-microresonator frequency comb.
Carrier-Free Dual-Comb Distance Metrology Using Two-Photon Detection
Authors: Wright Hollie , Sun Jinghua , McKendrick David , Weston Nick , Reid Derryck T.
Published: August 2021

By using cross-polarized dual combs and two-photon detection we demonstrate carrier- phase-insensitive time-of-flight distance measurement at 1555 nm with 93 nm precision and sampling rates exceeding by 2.4′ the conventional dual-comb metrology aliasing limit.
Frequency-modulated comb LiDAR without wavelength division de-multiplexer
Authors: Nishimoto Kenji , Minoshima Kaoru , Yasui Takeshi , Kuse Naoya
Published: August 2021

We propose and demonstrate frequency-modulated comb LiDAR without a wavelength division de-multiplexer, in which the LiDAR signals from the comb modes are separated in the RF domain at a single photo detector.
A nanosecond-tunable capacitive III-V/Si distributed feedback laser
Authors: de La Horie Pierre Fanneau , Verolet Théo , Provost Jean-Guy , Renaud Thibaut , Néel Delphine , Malhouitre Stéphane , Ramez Valentin , Hassan Karim , Wilk Arnaud , Shen Alexandre , Ramirez Joan Manel , Bitauld David
Published: August 2021

We demonstrate a heterogeneously integrated III-V/Si capacitive distributed feedback laser, which is continuously tunable across a 10 GHz band in less than 2 ns, with record-low power consumption
1.3 μm regrown quantum-dot distributed feedback lasers on (001) Si: a pathway to scale towards 1 Tbit/s
Authors: Wan Yating , Norman Justin , Tong Yeyu , Kennedy M. J. , Shang Chen , Selvidge Jenny , Tsang Hon Ki , Gossard Arthur C. , Bowers John E.
Published: August 2021

Regrown quantum-dot distributed feedback lasers on (001) Si demonstrated a SMSR of 50 dBm, a threshold current density of 440 A/cm2, a CW operation temperature of 70°C, and a path towards high-volume, low-cost transceivers.
Surface Grating VCSEL-Integrated Amplifier/Beam Scanner with High Power and Single Mode Operation
Authors: Hu Shanting , Gu Xiaodong , Hassan Ahmed , Nakahama Masanori , Koyama Fumio
Published: August 2021

We demonstrate a single-mode surface-grating VCSEL-integrated amplifier/beam scanner. The output power is over 500mW under pulsed operation. The continuous fan beam steering of 1.5° and a diffraction-limited narrow beam divergence of 0.06° are achieved.
Towards Holistic Control of THz Quantum Cascade Random Lasers
Authors: Limbacher Benedikt , Schönhuber Sebastian , Bachelard Nicolas , Kainz Martin A. , Andrews Aaron M. , Detz Hermann , Strasser Gottfried , Darmo Juraj , Rotter Stefan , Unterrainer Karl
Published: August 2021

We present a method to gain control of Quantum Cascade Random Lasers by illuminating them with spatially modulated near-infrared light. We employ deep learning to predict the response of the system to the near-infrared illumination.
Pump-probe experiments of the excited state dynamics of GR1 centers in diamond
Authors: Subedi Shova D. , Fedorov Vladimir V. , Mirov Sergey B. , Markham Matthew
Published: August 2021

The 658 nm probe kinetics revealed strong bleaching and multiexponential decay of the excited level with additional relaxation via intersystem crossing. The origin of induced excited state absorption was due to some other center impurity center.
Dual-Comb Spectroscopy with Two On-Chip III-V-on-Silicon 1-GHz Mode-Locked Lasers
Authors: Van Gasse K. , Chen Z. , Vincentini E. , Huh J. , Poelman S. , Wang Z. , Roelkens G. , Hänsch T. W. , Kuyken B. , Picqué N.
Published: August 2021

A dual-comb interferometer with two semiconductor lasers on silicon photonic chips enables an optical resolution of 1 GHz, over a 0.7-THz span. The spectrometer di- rectly and unambiguously samples near-infrared rovibrational transitions without spectral interleaving.
Internal structuring of silicon with multi-timescale irradiations
Authors: Das Amlan , Wang Andong , Utéza Olivier , Grojo David
Published: August 2021

By combining and synchronizing pulses of different durations from 170 fs to 5 ns, we benchmark the appropriate temporal characteristics of laser pulses for 3D writing applications inside silicon.
Printing Grayscale Optical Metasurface at Sub-10-nm-resolution via Light-controlled Capillary Force Lithography
Authors: Ji Myung Gi , Li Qiang , Kim Jaeyoun
Published: August 2021

By applying optical control to nanoscale capillary effect, we realize grayscale printing of polymer nanopixels with a sub-10-nm vertical resolution. Through spatial modulation of the control-light, we print various grayscale optical metasurfaces on-demand.
A Novel Geometry for integrated Photonic Characteristics of Colloidal Quantum Dots and micro-LED
Authors: Wang Shou-Wei , Huang Sheng-Kai , Lee Yi-Yang , Weng Shao-Yi , Kuo Hao-Chung , Lin Chien-Chung
Published: August 2021

We report a novel structure of U-shaped micro-LED to reduce the lateral leakage and explore the impact on QDs beside the quantum wells. Furtherly, optimize the utilized region of red QDs to reduce cost. Finally, make reliability test at 100 A/cm2 to make sure the usage region for red QDs.
The Light Cage - Integrated on-Chip Spectroscopy Using a Nano-Printed Hollow Core Waveguide
Authors: Kim Jisoo , Jang Bumjoon , Gargiulo Julian , Bürger Johannes , Zhao Jiangbo , Upendar Swaathi , Weiss Thomas , Maier Stefan A. , Schmidt Markus A.
Published: August 2021

We present a novel platform- the nano-printed optofluidic light cage - that allows for strong light-liquid interactions across centimetre distances via the antiresonant effect. In accordance with simulations we show liquid-based spectroscopic experiments.
All-fiber High-energy 174 fs Laser at 1.78 μm using parabolic W-type Normal Dispersion Thulium-doped Fiber
Authors: Chen Shaoxiang , Chen Yuhao , Liu Kun , Sidharthan Raghuraman , Li Huizi , Chang Chen Jian , Wang Qi Jie , Tang Dingyuan , Yoo Seongwoo
Published: August 2021

With the combination of proper dispersion management and W-type normal-dispersion thulium-doped fiber, we demonstrated an all-fiber 127.8nJ laser, exhibiting the shortest pulse duration of 174fs and highest peak power of 0.2MW in the 1.7m region.
Self-Mode-Locking in a Thulium-doped All-Fibre Ring Laser providing 1.18 nJ, 350 fs Solitons
Authors: Kirsch Dennis C. , Chernysheva Maria
Published: August 2021

Implication of self-mode-locking originated from lion-excited Thulium ions is investigated to construct a cost-effective 1.9 pm all-fibre laser. The laser generates 350fs solitons with 1.1811J energy at 44.8MHz repetition rate in flawless mode-locking.)
10-Hz, 636-ps, 1064-nm, All Polarization-Maintaining Fiber Front-End Based on Ultrafast Optical Fiber Pulse Chopping
Authors: Liu Yizhou , Hua Yi , Mohamadi Sedigheh Malek , Pergament Mikhail , Kärtner Franz X.
Published: August 2021

We propose a robust 10-Hz, 1064-nm, 636-ps, sub-µJ, all polarization-maintaining fiber front-end, which was realized by a combination of Sagnac loop and EO phase modulator for sub-ns-level optical chopping together with two AOM stages.
A 3.2-Gbps Beam Expanded Robust Uplink WDM OWC System Based on 860-nm and 940-nm VCSELs
Authors: Cao Zhiyuan , Zhang Shi , Wei Zixian , Zhang Li , Ma Keming , Fu H. Y. , Dong Yuhan
Published: August 2021

We proposed an 860-nm and 940-nm commercial VCSELs-based 1.5-meter 3.2-Gbps beam expanded robust uplink wavelength division multiplexing (WDM) system which can ignore collimation of the optical path within an area of 97.65 cm2.
Turbulence-Resistant Free-Space Optical Communication Using Mode Diversity Preamplification and Reception
Authors: Huang Yetian , Huang Hanzi , Chen Haoshuo , Zhang Qianwu , Li Yingchun , Wen Jianxiang , Fontaine Nicolas K. , Ryf Roland , Alvarado Juan Carlos , Amezcua-Correa Rodrigo , Song Yingxiong , Wang Min
Published: August 2021

We experimentally compare the performance with and without employing three-mode diversity reception over a 8-m free-space link under a laboratory-simulated turbulence. Few-mode preamplification is applied to enhance the receiver’s sensitivity.
The Circuit Implementation of Feedforward Equalization for High-Speed Real-Time Visible Light Communication Systems
Authors: Xu Weishu , Zhang Min , Han Dahai , Chen Qiguan
Published: August 2021

We experimentally demonstrated a 180 Mbps real-time visible light communication link with a low-cost and low-complexity adder-circuit-based feed forward equalizer with achieved extremely low bit error rate at 2.8710-6 over 2.3 m transmission distance.
Enhancing SiN Waveguide Optical Nonlinearity via Hybrid GaS Integration
Authors: Deckoff-Jones Skylar , Pelgrin Vincent , Zhang Jianhao , Lafforgue Christian , Deniel Lucas , Guerber Sylvain , Ribeiro-Palau Rebeca , Boeuf Frédéric , Alonso-Ramos Carlos , Vivien Laurent , Hu Juejun , Serna Samuel
Published: August 2021

Gallium sulfide is a van der Waals material with strong optical nonlinearities, while silicon nitride has a small nonlinear index. Here, we demonstrate enhanced all optical Kerr modulation in hybrid silicon nitride/gallium sulfide microring resonators.
Inverse-designed Optical Vortex Beam Emitters
Authors: White A. D. , Yang K. Y. , Vučković J.
Published: August 2021

We experimentally demonstrate a suite of integrated inverse-designed optical vortex beam emitters. As these emitters are extremely compact, 3×3 µm, they are capable of operating over a 60 nm uninterrupted band.
Metallic Grating Couplers – Broadband and Efficient
Authors: Messner Andreas , Jud Pascal A. , Winiger Joel , Eppenberger Marco , Koch Ueli , Haffner Christian , Ma Ping , Smajic Jasmin , Leuthold Juerg
Published: August 2021

Metallic grating couplers can be extremely broadband and efficient. In this work, we investigate an all-plasmonic fiber-to-chip coupler with a coupling efficiency of -2.7 dB and an optical 3-dB passband of 300 nm.
2D Vibrational Exciton nano-imaging as a molecular ruler of domain formation in self-assembled monolayers
Authors: Gray Thomas P. , Nishida Jun , Johnson Samuel C. , Raschke Markus B.
Published: August 2021

We develop precision infrared nano-imaging and -spectroscopy to probe vibrational excitons and associated vibrational wavefunction delocalization as a molecular ruler to study order and domains in molecular materials and self-assembled monolayer on the molecular scale.
Optical Trapping of Low Refractive Index Particles by Dual Vortex Beams
Authors: Nakaya Sho , Kozawa Yuichi , Uesugi Yuuki , Sato Shunichi
Published: August 2021

We present a novel method of optical trapping by a size-controllable dark spot produced by dual vortex beams, which realizes stable manipulation of micrometer size particles with a low refractive index.
Non-polarization-maintaining fiber based single-polarization, single-frequency erbium-doped distributed-feedback laser
Authors: Sun Wenjuan , Yu Yanjiang , Shi Jindan , Feng Xian
Published: August 2021

Phase-shifted fiber Bragg grating with high laser-induced birefringence is inscribed in a non-polarization-maintaining Er-doped silica fiber, by a novel femtosecond laser line-by-line direct-writing method. Efficient single-polarization, single-frequency distributed-feedback fiber laser is achieved.
High-efficiency Chirped Grating Couplers on Lithium Niobate on Insulator
Authors: Kang Shuting , Zhang Ru , Hao Zhenzhong , Jia Di , Gao Feng , Bo Fang , Zhang Guoquan , Xu Jingjun
Published: August 2021

Chirped grating couplers on lithium niobate on insulator (LNOI) with state-of-the-art theoretical (experimental) coupling efficiencies of 88.7%/coupler (72.0%/coupler) were realized on z-cut LNOI with an Au reflection layer.
Bidirectional electro-optic conversion reaching 1% efficiency with thin film lithium niobate
Authors: Xu Yuntao , Sayem Ayed Al , Fan Linran , Zou Changling , Tang Hong X.
Published: August 2021

We demonstrate an efficient, bi-directional electro-optic frequency converter based on a hybrid lithium-niobate/superconductor material platform. Through materials and device engineering to mitigate the limiting photorefractive effect, on-chip conversion effi-ciency of 1% is realized.
On-chip lithium niobate optical parametric oscillator with micro-watts threshold
Authors: Lu Juanjuan , Sayem Ayed Al , Gong Zheng , Surya Joshua B. , Tang Hong X.
Published: August 2021

We demonstrate an efficient optical parametric oscillator at the telecom band using a triple-resonant, periodically poled lithium niobate microring resonator, which, to the best of our knowledge, delivers the lowest threshold power (∼30 µW) for on-chip OPOs so far.
Doppler-Free Two-Photon Cavity Ring-Down Spectroscopy of a Molecular Vibrational Overtone Transition
Authors: Zhao Gang , Bailey D. Michelle , Fleisher Adam J. , Hodges Joseph T. , Lehmann Kevin K.
Published: August 2021

We demonstrate Doppler-free two-photon cavity ring-down spectroscopy using a narrow linewidth quantum cascade laser locked to a high-finesse cavity. Two-photon absorption of 14N216O at ~0 = 2207.507 cm−1 is reported.
Mode-resolved Cavity-enhanced Vernier Spectroscopy Using an Interband Cascade Laser Frequency Comb
Authors: Sterczewski Lukasz A. , Chen Tzu-Ling , Ober Douglas C. , Markus Charles R. , Canedy Chadwick L. , Vurgaftman Igor , Frez Clifford , Meyer Jerry R. , Okumura Mitchio , Bagheri Mahmood
Published: August 2021

We demonstrate a mid-IR mode-resolved Vernier optical frequency comb spectrometer with an interband cascade laser source. The free-running system provides 35 meters of effective path length for monitoring 1-THz-broad spectra at 3.63 µm.
Precision Solar Spectroscopy with Near Infrared Laser Heterodyne Radiometry
Authors: Fredrick Connor , Terrien Ryan , Mahadevan Suvrath , Quinlan Franklyn , Diddams Scott
Published: August 2021

With frequency-comb-calibrated laser heterodyne radiometry, we perform near-quantum-limited solar spectroscopy at 1565 nm. Solar spectral lines are resolved to 1 part in 1400 in 10 minutes of averaging.
Hollow core fiber microwave photonics link
Authors: Zhang Xi , Feng Zitong , Sakr Hesham , Hayes John R. , Poletti Francesco , Richardson David J. , Slavík Radan
Published: August 2021

A 7.7 km long link made of Nested Antiresonant Nodeless Fiber is demonstrated to reduce microwave link loss by over 15 dB as compared to a link made of SMF-28.
Controlling the Attenuation of Hollow Core Fibers Using Gas-Induced Differential Refractive Index
Authors: Kelly Thomas W. , Horak Peter , Davidson Ian A. , Partridge Matthew , Jasion Gregory T. , Rikimi Shuichiro , Taranta Austin , Richardson David J. , Poletti Francesco , Wheeler Natalie V.
Published: August 2021

We demonstrate significant confinement loss reduction in anti-resonant hollow-core fibers through refractive index changes induced by differential gas pressure filling of the core and cladding elements. In our fiber, loss reduces 2.8-fold at 1.3µm.
Direct Generation of Vortex Lattice Modes from an Intracavity Frequency Doubled Pr:YLF laser
Authors: Rao A. Srinivasa , Miyamoto Katsuhiko , Omatsu Takashige
Published: August 2021

We report on, for the first time, the direct generation of visible (640 nm) and ultraviolet (320 nm) optical vortex lattice modes from the frequency doubled diode-pumped Pr3+:YLF laser.
Multi-dimension Control on Complex Perfect Vortex Array
Authors: Wang Hao , Fu Shiyao , Gao Chunqing
Published: August 2021

A scheme is proposed to generate perfect vortex (PV) array with multi-tunable dimensions including multi-ring, topological charge, eccentricity, size and element number. The “Bear PV” along with assorted arrays are constructed to solidify foregoing theory.
151-as jitter, 22-GHz pulse train from a silica microcomb
Authors: Kwon Dohyeon , Jeong Dongin , Jeon Igju , Do In Hwan , Lee Hansuek , Kim Jungwon
Published: August 2021

We characterized the timing jitter of 22-GHz pulse train from silica microcomb using self-heterodyne method. The timing jitter power spectral density at 100-kHz offset is 3.6×10-37 s2/Hz with integrated jitter of 151-as [100 kHz–3 MHz].
An attosecond-precision balanced linear timing detector
Authors: Wang Tong , Ren Qun , Şafak Kemal , Kärtner Franz X. , Xin Ming
Published: August 2021

We demonstrate a linear-optics balanced timing detection method based on an acousto-optic modulator. A timing noise floor of ~1×10-10 fs2/Hz is achieved with 1 mW average power per pulse train per photodiode.
Deterministic Generation of Entanglement in Quantum Networks by Distributed Coherent Absorption
Authors: Vetlugin Anton N. , Guo Ruixiang , Soci Cesare , Zheludev Nikolay I.
Published: August 2021

We demonstrate that coherent absorption offers a robust and efficient way to generate quantum entanglement in multi-nodal quantum networks. Proof-of principle experiment in a bi-nodal network is reported.
Spectral Compression and Broadening using Time-Varying Cavities
Authors: Myilswamy Karthik V. , Weiner Andrew M.
Published: August 2021

We propose and analyse the use of time-varying cavities for spectral compression and spectral broadening, with potential applications in quantum networking. Our time-varying cavities rely on rapid electro-optic switching of input/ output coupling.
Strain-mediated energy control of rare-earth ions toward a highly-coherent hybrid opto-mechanical system
Authors: Ohta Ryuichi , Herpin Loic , Bastidas Victor M. , Tawara Takehiko , Yamaguchi Hiroshi , Okamoto Hajime
Published: August 2021

We demonstrate the energy modulation of Erbium ions using the vibrational strain of a mechanical resonator. This originates from the dispersive opto-mechanical interaction enabling the ions to be coherently coupled to the mechanical mode.
Etched-groove focusing GaAs surface acoustic wave cavities for enhanced coupling to quantum emitters
Authors: Imany Poolad , Wang Zixuan , McDonald Corey A. , Autry Travis , Berweger Samuel , Boutelle Robert C. , Kabos Pavel , Mirin Richard P. , Silverman Kevin L.
Published: August 2021

We demonstrate focusing cavities of surface acoustic waves on gallium arsenide with quality factors reaching 20,000. These cavities can potentially enhance coupling of surface phonons to a wide variety of quantum systems, possibly enabling efficient quantum transduction.
Optically-Triggered Optical Limiters for Short-Wavelength Infrared Sensor Protection
Authors: Wood Michael G. , McKay Alec , Morin Theodore J. , Serkland Darwin K. , Luk Ting S. , Wolfley Steve L. , Gastian Loren , Mudrick John P. , Jasperson Ben , Johnson Harley T.
Published: August 2021

We report experimental and numerical developments extending the operating range of vanadium dioxide based optical limiters into the short-wavelength infrared. Pixelated sensor elements have been fabricated which show optically-triggered limiting of a 2.7 µm probe.
2.7 kW fiber amplifier enabled by constant-cladding tapered-core Ytterbium-doped fiber
Authors: Lin Xianfeng , Zhang Zhilun , Xing Yingbin , Li Jinyan
Published: August 2021

We report a co-pumping fiber amplifier based on constant-cladding tapered-core Yb-doped fiber, and achieved a 2704 W laser output with the laser slope efficiency of 82.1%.
Highly-Doped Er:LiYF4 Waveguiding Epitaxial Films for ~2.7 µm Laser Sources
Authors: Basyrova Liza , Loiko Pavel , Brasse Gurvan , Benayad Abdelmjid , Doualan Jean-Louis , Braud Alain , Camy Patrice
Published: August 2021

Single-crystalline oriented highly-doped 9.6 at.% Er3+:LiYF4 waveguiding thin films (30-50 µm) are grown by Liquid Phase Epitaxy. Their polarized spectroscopic properties are studied. The maximum stimulated-emission cross-section is 1.61×10-20 cm2 at 2720 nm for π-polarization.
Integration of DFB laser with fluorescence analysis on a single chip
Authors: Zhang H. , Sano T. , Schmidt H.
Published: August 2021

We demonstrate integration of a DFB laser and an analyte detection region on a single chip. We showcase its sensing and pneumatically switchable functionalities with the detection of fluorescent nanoparticles and their concentration measurement.
Continuous Wavelength Tuning Across 3.9–12.0 µm From a 1040-nm-Pumped Optical Parametric Oscillator Based On Orientation-Patterned GaP Grown On GaAs
Authors: Schunemann Peter G. , Johnson Kerr , Farrell Carl , Maidment Luke , Shi Yiwen , Charsley Jake M. , Rutkauskas Marius , Reid Derryck T.
Published: August 2021

We report the first nonlinear frequency conversion—specifically optical parametric oscillation—in OPGaP layers grown by hydride vapor-phase epitaxy on OPGaAs templates. A fan-out grating provides continuously wavelength-tunable broadband pulses covering 3.9–12 µm.
Intra-pulse difference frequency generation spanning 7 to 14 µm with a 1-GHz mode-locked laser comb
Authors: Hoghooghi Nazanin , Lind Alex , Lesko Daniel , Xing Sida , Chang Peter , Rieker Greg , Diddams Scott
Published: August 2021

We present generation of MIR light from 1 GHz mode-locked lasers centered at 1.56 µm via intra-pulse difference frequency generation of 21.5 fs pulses. The generated MIR spectrum approaches an octave around 10 µm.
Low-Power Electro-Optic Actuators for Large-Scale Programmable Photonic Circuits
Authors: Bogaerts Wim , Van Iseghem Lukas , Edinger Pierre , Sattari Hamed , Takabayashi Alain Yuji , Chen Xiangfeng , Deng Hong , Verheyen Peter , Ribeiro Antonio , Khan Umar , Quack Niels , Gylfason Kristinn B.
Published: August 2021

Photonic integrated circuits are becoming increasingly more complex, especially with the emergence of programmable photonic circuits. These require many tunable photonic elements, such as electro-optic phase shifters and tunable couplers. We will discuss our progress in compact, low-power silicon photonics actuators based on heaters, liquid crystal and MEMS that can be scaled up to large circuits.
Effect of Pump Beam on the Amplified Signal Wavefront in DKDP Optical Parametric Amplification
Authors: Bahk S.-W. , Begishev I. A. , Webb B. , Jeon C. , Roides R. G. , Feng C. , Spilatro M. , Cuffney R. , Dorrer C. , Mileham C. , Bucht S. , Bromage J.
Published: August 2021

The wavefront introduced by optical parametric phase is investigated in a DKDP optical parametric amplifier by varying pump-beam amplitude and phase profiles, demonstrating their impact on the wavefront of the amplified output signal beam.
Super-Efficient Terahertz Detection Through High Switching-Contrast Plasmonic Nanocavities
Authors: Yardimci Nezih Tolga , Turan Deniz , Jarrahi Mona
Published: August 2021

We present a photoconductive terahertz detector, which utilizes a plasmonic nanocavity to offer broadband terahertz detection with large signal-to-noise ratio at record-low optical pump power levels.
Patch antenna arrays for efficient coupling of terahertz spoof surface plasmon polaritons to free space modes and for substance monitoring
Authors: Becker Sven , Rahm Marco
Published: August 2021

We report the implementation of compact patch antenna arrays that function as highly directive output couplers for strongly confined terahertz spoof surface plasmon polaritons (SSPPs). The specifically designed circular patches can efficiently transfer the energy of confined SSPPs on metasurfaces into radiating waves with a well-defined radiation pattern in free space. Since materials close to the metasurface impact the propagation of the SSPPs, the attenuation of the SSPPs translates into a power change of the radiated waves from the patch antennas, thus enabling sensitive detection of substances in the SSPP pathway.
High Fidelity 3D Image Synthesis with Dynamic Computer Generated Holography (DCGH)
Authors: Curtis Thérèse M. , Xu Jiayi , Caira Nicholas W. , Sata Asha Gowda , Pégard Nicolas C.
Published: August 2021

We demonstrate a new technique for high-resolution computer-generated holography. Our method rapidly displays a sequence of engineered wavefronts optimized together to render the desired illumination pattern. Experimental results show speckle-free 3D image synthesis capabilities.
Volumetric fluorescence microscopy using convolutional recurrent neural networks
Authors: Huang Luzhe , Luo Yilin , Rivenson Yair , Ozcan Aydogan
Published: August 2021

We demonstrate a convolutional recurrent neural network-based volumetric imaging framework, termed Recurrent-MZ. Using a few 2D fluorescence microscopy images as its input, Recurrent-MZ provides a 50-fold extended depth-of-field in imaging of 3D fluorescent samples.
Structured Illumination Microscopy Using Coupled Nanoridge Arrays
Authors: Haug John , Palei Milan , Shrout Joshua D. , Bohn Paul W. , Hoffman Anthony J.
Published: August 2021

Structured illumination microscopy using arrays of nanoridges is investigated. A resolution of ~50 nm (λ0 = 458 nm) is demonstrated. Compared to approaches leveraging surface-plasmon-polaritons, the coupled nanoridges improve the super-resolution by more than 10%.
Direct Hyperspectral Dual-Comb Imaging: Ultrafine Spectral and High Temporal Resolutions
Authors: Khan Farid Ullah , Mateos Pedro Martin
Published: August 2021

Hyperspectral dual-comb imaging is based on generating two closely matched frequency combs interfering at rates that can be detected by a video camera. The system provides ultrafine spectral and high temporal resolution enabling precision spectroscopic imaging.
A Compact Terahertz Polarization Beam Splitter Based on Directional Coupler
Authors: Deng Wentao , Chen Liao , Wang Ruolan , Wang Ziwei , Yuan Shixing , Yu Yu , Wu Xiaojun , Zhang Xinliang
Published: August 2021

We demonstrate a compact terahertz polarization beam splitter based on directional coupler. The extinction ratio over 8 dB is achieved from 0.445 to 0.475 THz for both TE and TM polarizations.
Terahertz Communications Using Rod-in-air Dielectric Subwavelength Fiber
Authors: Nallappan Kathirvel , Cao Yang , Xu Guofu , Guerboukha Hichem , Nerguizian Chahé , Skorobogatiy Maksim
Published: August 2021

In this work, we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define main challenges and trade-offs in the link implementation.
Integrated Terahertz Transceivers for Multi-node Link Discovery and Localization
Authors: Saeidi Hooman , Venkatesh Suresh , Lu Xuyang , Sengupta Kaushik
Published: August 2021

In this work, frequency-to-space mapping principle is exploited to demonstrate the simultaneous localization of multiple wireless nodes in 2D angular space in a single-shot fashion. This is achieved through on-chip, dual-port, frequency dispersive leaky-wave antennas operating in the frequency range of 360-400 GHz. The on-chip transceiver is fabricated on industry standard 65 nm CMOS process. We demonstrate 2D localization of wireless nodes with an accuracy of 1.95° at a resolution bandwidth of 20 Hz using cross-correlation based technique.
Experimental Demonstration of 8-Gbit/s QPSK Communications Using Two Multiplexed Orbital-Angular-Momentum Beams in the 0.27-0.33 THz Range
Authors: Zhou Huibin , Su Xinzhou , Minoofar Amir , Zhang Runzhou , Song Hao , Pang Kai , Zou Kaiheng , Song Haoqian , Hu Nanzhe , Zhao Zhe , Almaiman Ahmed , Zach Shlomo , Tur Moshe , Molisch Andreas F. , Sasaki Hirofumi , Lee Doohwan , Willner Alan E.
Published: August 2021

We experimentally demonstrate an 8-Gbit/s QPSK communication link using two multiplexed OAM beams at ~0.3 THz frequency. By tuning the frequency spacing between two lasers, such a system can be operated in the 0.27-0.33 THz range.
InGaAs Photodiode Array on Silicon by Heteroepitaxy
Authors: Song Bowen , Shi Bei , Brunelli Simone Šuran , Klamkin Jonathan
Published: August 2021

InGaAs photodiode arrays were realized on Si by heteroepitaxy, demonstrating a dark current as low as 5.71 nA at -1 V and responsivity as high as 0.64 A/W at 1550 nm and at room temperature.
Integration of VO2 Optical Memory on Silicon Waveguides
Authors: Jung Youngho , Han Hyeon , Parkin Stuart S. P. , Poon Joyce K. S.
Published: August 2021

We demonstrate VO2 optical memory integrated onto a silicon waveguide. Optical information is stored in the bistable states of VO2 and read out as the change in the optical transmission of the waveguide.
Low loss Gallium Oxide core/Silica cladding planar waveguide
Authors: Tan Si , Deng Huiyang , Urbanek Karel , Miao Yu , Zhao Zhexin , Harris James S. , Byer Robert L.
Published: August 2021

We demonstrate the fabrication and characterization of GaOx-core/SiO2-cladding waveguides. Propagation losses of –0.4 ± 0.1 dB/cm, –0.3 ± 0.2 dB/cm, and –2.4 ±0.5 dB/cm are achieved for 633 nm, 1064 nm and 1550 nm. Laser-induced damage threshold of > 2.5 J/cm2 is achieved for a 250 fs pulse.
Ultrafast Pulse Compression in Bulk with > 20 Times Spectral Broadening Factor from a Single Stage
Authors: Seidel Marcus , Balla Prannay , Arisholm Gunnar , Winkelmann Lutz , Hartl Ingmar , Heyl Christoph M.
Published: August 2021

We introduce the combination of multi-pass cell and multi-plate spectral broadening. We demonstrate the compression of 110-μJ pulses from 900-fs to 60-fs in a single stage and report broadening to 38-fs transform-limit by nonlinear mode-matching.
On-chip electrically driven 780 nm frequency-shifting optical isolation
Authors: Sohn Donggyu B. , Melia Josephine , Kim Soonwook , Orsel Ogulcan E , Bahl Gaurav
Published: August 2021

We demonstrate a 780 nm frequency-shifting optical isolator in a silicon nitride and aluminum nitride integrated photonics platform. The device uses non-reciprocity in a racetrack resonator through the action of electrically driven Rayleigh acoustic waves.
Present status and future perspectives of high power lasers at the NLHPLP
Authors: Zhu Jianqiang , Zhang Xiaoqi , Zhang Zhixiang , Wang Jiangfeng , Wei Hui , Yang Lin , Jiang Xiuqing , Zhang Guowen , Zhang Yanli , Wang Bingyan , Ren Lei , Sun Mingying , Liu Dean
Published: August 2021

The current developments of laser facilities at the NLHPLP are presented and the prospect of using low spatial incoherence beams to improve laser irradiation uniformity for direct-drive and indirect drive laser fusion is introduced.
Plasma-free Anisotropic Etching of GaN
Authors: Chan Clarence Y. , Namiki Shunya , Hite Jennifer K. , Li Xiuling
Published: August 2021

We demonstrate doping and growth dependent photo-enhanced metal-assisted chemical etching of homoepitaxial n-GaN on HVPE GaN substrates. Etch rate is comparable to or better than using RIE and there is no degradation of band-edge emission.
Localized Excitation of Silicon Photonic Waveguides for Measurement of Free-Carrier Lifetime and Surface Recombination Velocity
Authors: Goley Patrick S. , Preisler Edward , Cressler John D.
Published: August 2021

A pulsed 639 nm laser is focused to strongly excite 1-µm scale lengths of silicon photonic waveguide. Extraction of the local free-carrier lifetime and recombination velocity information from time-resolved transmission of a continuous 1535 nm probe laser is presented.
Deep Learning Method for Quantum Efficiency Reconstruction
Authors: Sharabi Yonatan , Patsyk Anatoly , Ziv Ron , Segev Mordechi
Published: August 2021

We suggest a new scheme for measuring the quantum efficiency of camera sensors based on the reflection from a variable width Fabry-Perot resonator and a deep learning algorithm, outperforming standart reconstruction methods.
Generation of high power ultrafast mid-infrared pulses through ZnGeP2
Authors: Zhou Fangjie , Wu Yi , Yin Yanchun , Chang Zenghu
Published: August 2021

We present the generation of femtosecond pulses centered at 3 and 8 μm through a ZnGeP2-based Optical Parametric Chirped Pulse Amplifier. The output can be used for a two-color high harmonic generation scheme.
High-Peak Power Polarization-Multiplexed Yb:CaF2 Dual-Comb Solid-State Laser with 100-fs Pulse Duration
Authors: Pupeikis Justinas , Willenberg Benjamin , Bauer Carolin , Phillips Christopher R. , Keller Ursula
Published: August 2021

We demonstrate a diode-pumped Yb:CaF2 dual-comb oscillator at 80-MHz repetition rate. The common-path polarization-multiplexed cavity delivers >2.1 W of output power in each comb with 100-fs pulse duration exceeding 230-kW peak power.
Nonlinear fiber amplifier for intensity-noise reduction to the shot-noise limit
Authors: Edelmann Marvin , Hua Yi , Şafak Kemal , Kärtner Franz X.
Published: August 2021

We demonstrate an all-PM fiber amplifier for intensity-noise reduction of pulsed input signals. Based on the nonlinear phase difference accumulation of copropagating orthogonal polarization modes in a PM-fiber, shot-noise limited noise reduction is verified.
Stimulated Raman Scattering in a Tapered Submicron Silicon Core Fiber
Authors: Huang Meng , Ren Haonan , Shen Li , Wu Dong , Sun Shiyu , Hawkins Thomas W. , Ballato John , Gibson Ursula J. , Peacock Anna C.
Published: August 2021

Raman scattering is observed for the first time in a tapered silicon core fiber. Both spontaneous and stimulated effects are presented, with a gain up to 0.8 dB achieved with a 58.5 mW telecom pump.
Mid-infrared soliton self-frequency shift using ultra-low pump pulse energy
Authors: Alamgir Imtiaz , Shamim Md Hosne Mobarok , Correr Wagner , Messaddeq Younès , Rochette Martin
Published: August 2021

We generate Raman solitons tunable within the spectral range of 2.0-2.6 µm from an ultralow pump pulse energy of 64 pJ. This is the lowest pump energy ever used to obtain wideband soliton shift.
Long-Range Propagation of Indirect Excitons in MoSe2/WSe2 van der Waals Heterostructure
Authors: Fowler-Gerace L.H. , Choksy D.J. , Butov L.V.
Published: August 2021

We realize long-range propagation of indirect excitons in a MoSe2/WSe2 heterostructure. The data show that the long-range propagation of indirect excitons is possible in van der Waals heterostructures with the predicted moiré superlattice potentials.
High-Aspect-Ratio Free-Standing Membrane Waveguides for Mid-Infrared Nanophotonics
Authors: Vlk Marek , Datta Anurup , Alberti Sebastian , Aksnes Astrid , Murugan Ganapathy Senthil , Jágerská Jana
Published: August 2021

Nanophotonic devices for optical sensing often display poor evanescent field interaction. We demonstrate a suspended thin-film waveguide with stronger light–analyte interaction than a free-space beam, as verified by detecting acetylene at 2566 nm.
Photonic integrated alumina waveguide gratings for far-field structured illumination at UV wavelengths
Authors: Lin Chupao , Peñaranda Juan Santo Domingo , Dendooven Jolien , Detavernier Christophe , Schaubroeck David , Baets Roel , Le Thomas Nicolas
Published: August 2021

We demonstrate far-field UV structured illumination implemented with in-tegrated aluminum oxide (AlOx) waveguide gratings. Based on simulation and experi-mental results, we discuss the performances of two AlO
x
waveguide gratings operating at λ = 360nm.
Low-Loss Nanoslot Waveguides for Sensing Fabricated in a CMOS Foundry
Authors: Tyndall Nathan F. , Kozak Dmitry A. , Pruessner Marcel W. , Goetz Peter G. , Rabinovich William S. , Stievater Todd. H. , Bryan Michael R. , Luta Ethan , Miller Benjamin L. , Fahrenkopf Nicholas M. , Antohe Alin
Published: August 2021

We demonstrate propagation loss as low as 0.3 dB/cm and high-fidelity sens-ing in foundry-fabricated silicon nitride nanoslot waveguides designed for wavelengths be-tween 700 nm and 1600 nm.
Gain-assisted microcomb dual-soliton manipulation
Authors: Tan Teng , Yuan Zhongye , Chen Hao-Jing , Zhang Hao , Qin Chenye , Wong Chee Wei , Rao Yunjiang , Xiao Yun-Feng , Yao Baicheng
Published: August 2021

By using a 980 nm control laser to excite the erbium doped microsphere resonators, we realized remarkable soliton access range enhancement and counter-propagating dual-soliton manipulation, including fast on-off switch (7MHz) and beat note tuning (up to 52 kHz/mW).
Genetic Algorithm Optimization for Ultra-broadband Long-wave Infrared Seed Pulse Generation
Authors: Huang Hao , Xiao Xuan , Nees John , Jovanovic Igor
Published: August 2021

We demonstrate the production of broadband long-wave infrared pulses cen-tered near 10.3 μm using difference-frequency generation. An accompanying simulation shows that genetic algorithm optimization of chirp can significantly increase the spectral bandwidth.
Experimental Demonstration of Vortex Mode Demultiplexing using a Concentric-Ring Transformation
Authors: Cao Han , Liang Yize , Wang Lulu , Wang Hongya , Wang Jian
Published: August 2021

A concentric-ring transformation method is presented to realize high-resolution sorting of vortex modes. We experimentally demonstrate the efficient demultiplexing of vortex modes with a low crosstalk <-12 dB.
Broadband 5Gb/s Optical RAM Cell over the C-band
Authors: Pappas C. , Moschos T. , Mourgias-Alexandris G. , Alexoudi T. , Vagionas C. , Gradkowski K. , Nudds N. , O'Brien P. , Miliou A. , Pleros N.
Published: August 2021

A broadband optical RAM cell comprising a monolithic InP Flip-Flop and a Random Access Gate is experimentally presented with at least 5 Gb/s error-free operation and less than 4.5dB power penalty across the whole C-band.
2 17 GHz Soliton-like Harmonic Mode-locking Generated from an Yb-doped Fiber Laser with Anomalous Net Dispersion
Authors: Zhao Zihao , Jin Lei , Set Sze Yun , Yamashita Shinji
Published: August 2021

We demonstrate a 2.17 GHz harmonically mode-locked Yb-doped fiber laser with low pump power, which has a fundamental frequency of 167 MHz. The RF signal-to-noise ratio was confirmed larger than 60 dB.
Design and fabrication of a single-mode and ultra-low loss hollow-core fiber based on Kagome-tubular hybrid lattice
Authors: Amrani F. , Osorio J. H. , Delahaye F. , Giovanardi F. , Vasko K. , Vincetti L. , Debord B. , Gerome F. , Benabid F.
Published: August 2021

We propose a hybrid Kagome-tubular lattice hollow-core fiber for ultra-low loss and single-mode operation. The fiber displays a minimum loss of 1.6dB/km at 1050nm and a higher- order modes extinction of 47dB for a 10m-long fiber.
Demonstration of an rf Electrometer Based on EIT Spectroscopy of Non-Resonantly Dressed Rydberg Atoms
Authors: Chai Lingyun , Jones Robert R.
Published: August 2021

We present a self-calibrating, broadband technique for characterizing rf-fields. The method is based on electromagnetically induced transparency, exploiting non-linear mixing of rf and DC fields through non-resonant Rydberg dressing in a room temperature Rubidium cell.
Error-Free Kerr Comb-Driven SiP Microdisk Transmitter
Authors: Novick Asher , Rizzo Anthony , Gopal Vignesh , Duadlin Stuart , Murthy Vaishnavi , Hattink Maarten , Hung Yu-Han , Okawachi Yoshitomo , Kim Bok Young , Ji Xingchen , Gaeta Alexander , Lipson Michal , Bergman Keren
Published: August 2021

We demonstrate the first SiP microdisk modulated Kerr comb source with BER better than 1E-9 up to 16 Gb/s/λ. The modulated lines span 44.3 nm bandwidth, paving the path to a comb-driven integrated SiP transmitter.
Phosphor-free III-nitride red micro-light emitting diodes for display applications
Authors: Jain Barsha , Velpula Ravi Teja , Nguyen H. P. T.
Published: August 2021

In this study, we report highly stable phosphor-free InGaN/AlGaN spontaneously formed core-shell nanowire red micro-light emitting diodes (μLEDs) with 30 × 30 μm2 mesa area directly grown on Si (111) substrates using molecular beam epitaxy.
Near-Infrared 10-GHz Astrocomb With Mode Identification
Authors: Cheng Yuk Shan , Xiao Dong , McCracken Richard A. , Reid Derryck T.
Published: August 2021

We present a 10-GHz astrocomb spanning 1.15–1.8 µm and based on a spectrally broadened degenerate optical parametric oscillator. Absolute mode identification is provided by a Fourier-transform spectrometer cross-calibrated to the comb-mode spacing.
Demonstration of a Real-Time Orbital Angular Momentum (OAM) Sensor for Probing Variable Density Fog Clouds
Authors: Dai Kunjian , Miller J. Keith , Watkins R. J. , Dogariu Aristide , Johnson Eric G.
Published: August 2021

This paper introduces a sensor for interrogating dynamic propagation environments for real-time detection of time-varying beams with OAM. As an example, a rotating variable fog distribution is created and sensed for induced changes in OAM.
Rotation Measurement Using Spatially Incoherent Light and the Rotational Doppler Shift
Authors: Anderson Alexander Q. , Strong Elizabeth F. , Heffernan Brendan M. , Siemens Mark E. , Rieker Gregory B. , Gopinath Juliet T.
Published: August 2021

We measure the rotational Doppler shift from a spinning target illuminated with spatially and temporally incoherent light. This demonstrates that a well-defined orbital angular momentum spectrum is not required to observe a rotational Doppler shift.
Raman-Kerr Combs in High-Q Chalcogenide Microresonators Coupled to Silicon Waveguides
Authors: Jean Philippe , Douaud Alexandre , LaRochelle Sophie , Messaddeq Younès , Shi Wei
Published: August 2021

We report the observation of Kerr frequency combs and Raman lasing in a high-Q (Q>1.5e6) As20S80 microresonator monolithically integrated with silicon-on-insulator waveguides.
Mode-locked dark-pulse Kerr combs in normal-dispersion AlGaAs-on-insulator microresonators
Authors: Shu Haowen , Shen Bitao , Chang Lin , Xie Weiqiang , Qin Jun , Jin Ming , Zhang Xuguang , Wang Xingjun , Bowers John. E.
Published: August 2021

We demonstrate dark-pulse Kerr combs from a high-Q Al0.2Ga0.8As-on-insulator microresonator with normal dispersion. Low-noise combs are achieved for the first time at room temperature in this efficient platform, with low pump power of <5 mW.
Ultra-low power wavelength conversion via four-wave mixing in a Ge11.5As24Se64.5 chalcogenide microring resonator
Authors: Jiang Wei C. , Li Kangmei , Gai Xin , Nolan Daniel A. , Dainese Paulo
Published: August 2021

We demonstrate ultra-low power wavelength conversion via four-wave mixing in a Ge11
.
5As24Se64
.
5 microring resonator with 20-µm radius. The results show conversion efficiency of -33.7 dB with only 63.8 µW pump power.
Image reconstruction and enhancement through wavelength-sensitive speckle multiplexing and deconvolution
Authors: Wang Zhao , Ma Rui , Zhang Yong , Zhu Hong Yang , Liu Jun , Bromberg Yaron , Zhang Wei Li
Published: August 2021

Partially spatially coherent illumination from multimode fiber is proposed for imaging through opacity based on deconvolution algorithm. The image quality is greatly enhanced by multiplexing the speckle or the reconstructed images from different illuminating wavelengths.
Efficient 976 nm laser based on an all-solid and large-mode-area multicore Yb-doped fiber
Authors: Li Huizi , Raghuraman Sidharthan , Chen Shaoxiang , Zang Jichao , Ishaaya Amiel , Yoo Seongwoo
Published: August 2021

We present an efficient 976 nm laser from an all-solid Ytterbium-doped multicore fiber. Based on the large core-to-cladding area ratio and wavelength selective bending technique, 25 W output power is achieved with 46% slope efficiency.
High-order mid-IR multiphoton absorption and nonlinear refraction in GaP, ZnSe, GaSe, and ZGP crystals
Authors: Kawamori Taiki , Schunemann Peter G. , Vodopyanov Konstantin L.
Published: August 2021

Using Z-scan and femtosecond 2.35-μm pulses, we study high-order nonlinear effects in monocrystals. We find the multiphoton absorption order N varies from N=6 (GaP, ZnSe) to N=4 (GaSe, ZGP), in accordance with the crystals’ bandgaps.
Optical Parametric Amplification with a Spatially-Homogenized Pump Laser
Authors: Batysta František , Willard Drew , Sistrunk Emily , Alessi David , Spinka Thomas M. , Reagan Brendan A.
Published: August 2021

We demonstrate optical parametric amplification using a spatially-homogenized pump beam for the first time and investigate the impact of pump beam angular content on OPA efficiency and bandwidth.
Non-collinear Optical Parametric Oscillator as fast tunable light source for Stimulated Raman Scattering
Authors: Beichert Luise , Binhammer Yuliya , Andrade José R. C. , Morgenr Uwe
Published: August 2021

We present a Non-collinear Optical Parametric Oscillator quickly tunable between 700 and 1030 nm within a few microseconds. It is used for high-speed Stimulated Raman Scattering experiments with up to 100 spectra per second.