bluuebunny/crossref_metadata_2025 huggingface dataset:
Temperature insensitive refractive index sensor based on long-period fiber gratings in capillary
Authors: Tang Mengxue , Zhao Yunhe , Wang Wei , Yang Yongsheng , He Zuyuan
Published: January 2022

We proposed a refractive index (RI) sensor based on arc-discharged long-period fiber gratings in capillary. Sensing performance of the gratings have been investigated experimentally. The proposed RI sensor is insensitive to the external temperature variation.
Phase Noise Compensation in Optical Carrier-Assisted Single-sideband and Direct Detection PAM-4 System
Authors: Lu Dongxu , Huo Jiahao , Yuan Jinhui , Zhou Xian , Long Keping
Published: January 2022

We propose a joint phase noise compensation scheme including SP-LMS and RPD-BPS algorithm in the optical carrier-assisted SSB-DD PAM4 system with high spectral efficiency, which can tolerate 1-MHz laser linewidth at a BER of 3.8e-3.
Analysis and Compensation of Equalization-Enhanced Phase Noise in Carrier Assisted Differential Detection System
Authors: Qin Peng , Bai Chenglin , Xu Hengying , Yang Lishan , Sun Weibin , Yu Xinkuo , Lv Xiuhua , Tang Xue , Bi Yanfeng , Luo Xueyuan
Published: January 2022

In this paper, the influences of EEPN in the A-CADD and S-CADD systems are analyzed for the first time. Meanwhile, we demonstrate the mitigation of the EEPN influence using ML and BPS phase compensation algorithms.
GHz-bandwidth Optical Filters Based on High-order Lithium Niobate Microring Resonators
Authors: Ding Yuedi , Tao Shiqi , Pan An , Zeng Cheng , Xia Jinsong
Published: January 2022

We demonstrate GHz-bandwidth optical filters using cascaded lithium niobate (LN) microring resonators (MRRs). The inserted loss is 0.84 dB and the extinction ratio is about 35 dB. They can find relevant application in microwave photonics.
A Compact Y-branch Power Splitter with an Arbitrary Power Splitting Ratio Based on Thin-film Lithium Niobate Platform
Authors: Ke Wei , Lin Zhongjin , Cai Xinlun
Published: January 2022

A compact power splitter with an arbitrary split ratio for the thin-film lithium niobate platform is proposed. The power splitting ratio can be selected from 0 dB to 15 dB with over 100nm bandwidth.
Innovative Spectroscopy and Hyperspectral Imaging Systems Based on a Common-path Birefringent Interferometer
Authors: Preda Fabrizio , Perri Antonio , Manzoni Cristian , Cerullo Giulio , Polli Dario
Published: January 2022

We present a compact, ultra-stable common-path birefringent interferometer for Fourier-transform spectroscopy that provides several advantages with respect to standard amplitude-division interferometers. We illustrate a very broad portfolio of experimental applications from time-resolved fluorescence spectroscopy to non-linear (pump-probe, two-dimensional and coherent Raman) spectroscopy, from hyperspectral imaging for remote sensing to microscopy for biological applications.
Development of Fast Frequency Comb Mid-Infrared Spectroscopy for Stopped Flow Applications
Authors: Horvath Raphael , King Edward J. , Eigenmann Florian , Mangold Markus , Hugi Andreas
Published: January 2022

Dual frequency comb spectroscopy is used to address limitations of stopped flow infrared spectroscopy, namely, speed, resolution, and the need to repeat reactions to obtain good signal to noise ratios at short timescales.
Integrated Optical Phased Arrays for LiDAR, Communications, Augmented Reality, and Beyond
Authors: Notaros Jelena , Notaros Milica , Raval Manan , Poulton Christopher V. , Byrd Matthew J. , Li Nanxi , Su Zhan , Magden Emir Salih , Timurdogan Erman , Dyer Thomas , Baiocco Christopher , Kim Taehwan , Bhargava Pavan , Stojanovic Vladimir , Watts Michael R.
Published: January 2022

Recent integrated optical phased array architectures, results, and applications will be reviewed, including beam steering for LiDAR and communications, near-field optical manipulation, and holographic displays for augmented reality.
Supporting the Quantum Photonics Supply Chain with Scalable, Fiber-Compatible Instruments
Authors: Jestin Yoann , Roztocki Piotr , MacLellan Benjamin , Helsten Robin , Montaut Nicola , Reimer Christian , Kues Michael , Morandotti Roberto
Published: January 2022

We discuss two essential building blocks required by the quantum photonics industry: an ultra-stable interferometer and a photon pair source. Both make use of optical fiber/integrated components and actively support the quantum supply chain.
Time-Domain Optical Fiber Physical Unclonable Function Reader via Minimal Overhead Reflectometer
Authors: Mauldin Thomas , Xu Zhenyu , Wei Tao
Published: January 2022

A time-domain optical physical unclonable function reader is implemented using components in communication infrastructures, enabling transceiver-integrated authentication for secure communication and anti-counterfeit applications. Fiber, 25cm and longer, is authenticated with an error less than 1%.
Structuring light using solgel hybrid 3D-printed optics prepared by two-photon polymerization
Authors: Lightman Shlomi , Bin-Nun Moran , Bar Galit , Hurvitz Gilad , Gvishi Raz
Published: January 2022

Three-dimensional direct laser writing based on a two-photon polymerization process of hybrid organic-inorganic material was used to print micrometer-scale refractive phase elements that were designed to manipulate incoming Gaussian beams into line and square intensity-flattened profiles. Here we present new results of shaping light beams, enabled by tailoring a two-photon absorption process for printing hybrid material structures based on a fast solgel process. The optical design and calculations of the optical elements are described, along with characterization of their performance in manipulating incoming light beams. The novelty described in this work, to the best of our knowledge, is the implementation of 3D solgel materials as better and improved micro-optics. This new ability provides upgraded 3D high resolution and smooth, printed optical phase structures using tailored hybrids with improved optical and mechanical properties compared to standard common photoresists. This opens new and exciting opportunities for compact and robust beam shaping by reaching glassy material properties and overcoming limitations of organic polymers.
High Energy Pulsed Operation of a Tapered Rod-Type Multicore Fiber Amplifier
Authors: Aleshire Christopher , Steinkopff Albrecht , Karst Maximilian , Klenke Arno , Jauregui Cesar , Kuhn Stefan , Nold Johannes , Haarlammert Nicoletta , Schreiber Thomas , Limpert Jens
Published: January 2022

Nanosecond-class pulse energies up to 32 mJ are obtained from a tapered
rod-type multicore fiber. The tapered fiber improves output beam
quality in large multimode cores, with targeted application in
ultrafast coherently combined systems.
1 kHz Repetition Rate 1.1 J Picosecond Laser
Authors: Wang Yong , Chi Han , Dehne Kristian , Baumgarten Cory , Meadows Alexander R. , Davenport Aaron , Murray Gabe , Reagan Brendan A. , Menoni Carmen S. , Rocca Jorge J.
Published: January 2022

We demonstrate a 1.1 kW average power picosecond laser emitting 1.1 J
pulses of 4.5 ps duration at 1 kHz repetition rate from a
cryogenically cooled diode-pumped chirped pulse amplification Yb:YAG
laser.
Thin-Disk based Regenerative Chirped Pulse Amplifier with 550 mJ Pulse Energy at 1 kHz Repetition Rate
Authors: Pfaff Yanik , Rampp Michael , Herkommer Clemens , Jung Robert , Teisset Catherine Y. , Klingebiel Sandro , Metzger Thomas
Published: January 2022

We demonstrate a thin-disk based regenerative amplifier system with a
maximum pulse energy before compression of 550 mJ at a repetition rate
of 1 kHz. A fraction of the output was recompressed to 602 fs.
Multi-kilowatt Ultrafast Laser with Thin-disk Technology
Authors: Dominik Johanna , Scharun Michael , Dannecker Benjamin , Nagel Simon , Dekorsy Thomas , Bauer Dominik
Published: January 2022

We present a thin-disk multipass amplifier as a power scaling
architecture for ultrafast lasers. 1950 W output power at a repetition
rate of 800 kHz were achieved with pulses pre-compressed to 10 ps.
9 W Erbium-Doped Dual-Wavelength Pumped All-Fiber Laser at 3.55 µm
Authors: Lemieux-Tanguay Maxime , Fortin Vincent , Boilard Tommy , Vallée Réal , Bernier Martin
Published: January 2022

A dual-wavelength pumped Er3+:ZrF4 all-fiber
laser generating a maximum output power of 8.82 W at 3.55 µm is
reported. Experimental results supported by a numerical modeling based
on the population dynamics are presented.
Thermally tunable all-fiber laser operating at 3.24 µm for remote sensing of methane
Authors: Michaud Louis-Charles , Boilard Tommy , Fortin Vincent , Magnan-Saucier Sébastien , Vallée Réal , Bernier Martin
Published: January 2022

We report on a tunable all-fiber dysprosium continuous wave laser
operating around 3.24 µm, based on a counter-propagating pumping
scheme. The system producing 1.1 W of output power will find
applications in methane imaging and spectroscopy.
Monolithic Praseodymium-Doped Fiber Laser at 635 nm
Authors: Lord Marie-Pier , Fortin Vincent , Maes Frédéric , Talbot Lauris , Bernier Martin , Vallée Réal
Published: January 2022

We report the first demonstration of a monolithic fiber laser in the
visible. The laser cavity, based on a double-clad praseodymium-doped
fiber spliced to a fiber Bragg grating, yields a record output power
of 2.3 W at 635.5 nm.
Laser Cooling of Yb3+-doped CaF2 and SrF2 Crystals
Authors: Mauerhoff Felix , Püschel Stefan , Kränkel Christian , Tanaka Hiroki
Published: January 2022

We report on laser cooling of ytterbium (Yb3+)-doped
fluorite-type crystals for the first time. Czochralski-grown
Yb3+(5 at.%):CaF2 and Yb3+(5
at.%):SrF2 single crystals are cooled by laser excitation
at 1040 nm.
First Measurements of Nonlinear Second-Order Frequency Conversion Phase-Matching Conditions in the Uniaxial Crystal α-GeO2
Authors: Remark Théodore , Segonds Patricia , Pena Alexandra , Menaert Bertrand , Debray Jérôme , Pujol Maria Cinta , Boulanger Benoît
Published: January 2022

We report the first phase-matching conditions for sum- and difference-
frequency generations directly measured over the full transparency
range of the uniaxial α-GeO2 crystal. We also determined
the damage threshold energy and intensity.
Path to high energy, high repetition rate tunable femtosecond ultraviolet pulse generation
Authors: Tajalli Ayhan , Alisauskas Skirmantas , Kazemi Mehdi , Lang Tino , Hartl Ingmar
Published: January 2022

We show that a combination of OPCPA and cascaded SFM can efficiently
generate 100 µJ, MHz repetition rate, 50 fs, tunable pulses from 279
nm to 317 nm for seeding superconducting X-ray free electron
lasers.
Efficient Generation of Bright Few-Femtosecond Deep Ultraviolet Pulses at 50 kHz Repetition Rate in a Compact System
Authors: Brahms Christian , Travers John C.
Published: January 2022

We demonstrate a bright, efficient, and compact source of tuneable
ultrafast laser pulses at 50 kHz repetition rate in the deep
ultraviolet based on resonant dispersive wave emission in hollow
capillary fibre.
Initial development of diode-pumped multipass laser amplifier based on Tm:Lu2O3 around 2 μm
Authors: Cellamare Gianluca , Labate Luca , Baffigi Federica , Palla Daniele , Gizzi Leonida Antonio
Published: January 2022

We describe the initial development of an edge-pumped ceramic Tm:Lu2O3
multipass amplifier for ultra-short pulse laser with high-repetition
rate, high-peak power and high-average power, with an overview of the
laser chain and the amplifiers specifications
Upconversion Pumping of 1.9-µm Tm3+:KY3F10 Laser with an Ytterbium Fiber Laser
Authors: Morova Yagiz , Kamun Eylul Nihan , Tonelli Mauro , Sennaroglu Alphan
Published: January 2022

We report a continuous-wave
Tm3+:KY3F10 laser which is
upconversion pumped with a 1064-nm ytterbium fiber laser, delivering
tunable laser output between 1849 and 1994 nm with an average absorbed
power slope efficiency of 29%.
Vector Solitons in a Kerr-lens Mode-locked Laser Oscillator
Authors: Vasilyev Sergey , Sander Michelle Y. , Gu Jiahui , Smolski Viktor , Moskalev Igor , Mirov Mike , Barnakov Yury , Peppers Jeremy , Kolesik Miroslav , Mirov Sergey , Gapontsev Valentin
Published: January 2022

We demonstrate vector solitons in a few-cycle polycrystalline Cr:ZnS
oscillator at the middle-IR wavelength 2.4 µm and deploy realistic
simulations to identify χ(2) nonlinearity in a polycrystal
as the main factor contributing to polarization dynamics.
High-Power SESAM-modelocked Ho:YAG laser at 2090 nm
Authors: Tomilov Sergei , Hoffmann Martin , Heidrich Jonas , Alaydin Behçet Özgür , Golling Matthias , Wang Yicheng , Keller Ursula , Saraceno Clara J.
Published: January 2022

We demonstrate a SESAM, soliton-modelocked, Ho:YAG thin-disk oscillator
with more than 40 W of average power, 1.66-ps pulses at energy of 0.78
µJ, representing the highest average power so far demonstrated from an
oscillator in the 2 µm wavelength region. We discuss current
limitations and paths to overcome them in the near future.
2-GHz High-power Kerr-lens Mode-locked Yb:KGW Laser
Authors: Zheng Li , Tian Wenlong , Wang Geyang , Bai Chuan , Zhang Dacheng , Zhu Jiangfeng , Wei Zhiyi
Published: January 2022

We present a 2-GHz high-power Kerr-lens mode-locked Yb:KGW laser, 1.7-W
average power with 145-fs pulse duration and ~740-mW average power
with ~120 fs pulse duration was achieved in unidirectional and
bidirectional operation, respectively.
Synthesis and complete characterization of a low-noise Yb:CALGO Optical Frequency Comb
Authors: Canella Francesco , Molteni Lisa M. , Pirzio Federico , Betz Markus , Vicentini Edoardo , Coluccelli Nicola , Piccinno Giuliano , Agnesi Antonioangelo , Laporta Paolo , Galzerano Gianluca
Published: January 2022

The realization and complete characterization of a compact Optical
Frequency Comb operating in the wavelength range from 670 to 1500 nm,
based on diode-pumped low-noise femtosecond Yb:CALGO amplified laser
system, is reported.
Spectroscopic Evaluation of Er3+:Ga2Ge5S13 Glass for Mid-IR Laser Applications
Authors: Brown Ei Ei , Fleischman Zackery D. , Dubinskii Mark , Hömmerich Uwe , Trivedi Sudhir B.
Published: January 2022

Spectroscopic properties of
Er3+:Ga2Ge5S13 glass are
reported for the first time, to the best of our knowledge. The low
maximum phonon energy of the host and a millisecond-long nearly
temperature-independent fluorescence lifetime of the
4I9/2 level, make this material promising as a
gain material for Mid-IR laser applications.
QCL-seeded femtosecond optical parametric amplifier operating beyond 4.5 μm
Authors: Jiang Weiqi , Qin Jiarong , Dai Ruihong , Meng Yafei , Wang Fengqiu
Published: January 2022

We demonstrate a femtosecond optical parametric amplifier seeded by an
external-cavity QCL, with up to 200 mW average power. The system can
operate beyond 4.5 μm, with a tuning range of 300 nm (4400-4700 nm)
and a pulse duration <350 fs.
Thermal Expansion Coefficient of Materials for Laser Ceramics Evaluated by the First Principles Calculation
Authors: Sato Yoichi , Taira Takunori
Published: January 2022

We proposed numerical models for thermal expansion of ceramic laser
materials from 150K to 900K, where expansion was CaF2
>> Sc2O3 > ZnS > ZnSe ~
Lu3Al5O12 >
Y3Al5O12 >
Y2O3 > Lu2O3 at
300K.
Room temperature Er:Y2O3 ceramic laser at ~1.6 μm
Authors: Xie Hangbin , Zhang Jianing , Wang Fei , Wang Jun , Tang Dingyuan , Shen Deyuan
Published: January 2022

We report on room temperature operation of an
Er:Y2O3 ceramic laser at 1640.4 nm for the first
time, generating over 5.2 W of output power with a slope efficiency of
24.9%.
Guiding of Laser Pulses at the Theoretical Limit – 97% Throughput Hollow-Core Fibers
Authors: Jeong Young-Gyun , Piccoli Riccardo , Rovere Andrea , Zanotto Luca , Tempea Gabriel , Wilson Derrek , Ivanov Maksym , Ramirez Alicia , Morandotti Roberto , Légaré François , Razzari Luca , Schmidt Bruno E.
Published: January 2022

We describe a compact, 1-m-long, hollow-core fiber (HCF) with 97.4%
transmission. 1mJ, 170fs pulses are compressed to 25fs with 92% total
efficiency, energy stability of 0.6% RMS and an M2
parameter of about 1.05.
Post-compression of 8.6 mJ ps-pulses from an Yb:YAG Innoslab amplifier using a compact multi-pass cell
Authors: Rajhans Supriya , Velpula Praveen Kumar , Escoto Esmerando , Shalloo Rob , Farace Bonaventura , Põder Kristjan , Osterhoff Jens , Leemans Wim P. , Hartl Ingmar , Heyl Christoph M.
Published: January 2022

We demonstrate post-compression of a high energy Yb:YAG laser in a 2m
long Argon-filled multi-pass cell (MPC). 1.2 ps pulses with 8.6 mJ are
compressed to 44 fs with an MPC transmission of 93%.
Monolithically integrated widely tunable single-frequency diamond Raman lasers
Authors: Granados Eduardo , Chrysalidis Katerina , Fedosseev Valentin N. , Leask Vaila , Marsh Bruce A. , Wilkins Shane G. , Mildren Richard P. , Spence David J.
Published: January 2022

We report on tunable single-frequency monolithic diamond Raman lasers
capable of efficiently compressing the linewidth of pulsed high power
multi-mode lasers by nearly two orders of magnitude, approaching the
Fourier limit.
20.3 W Brillouin lasing in diamond
Authors: Jin Duo , Bai Zhenxu , Qi Yaoyao , Ding Jie , Wang Yulei , Lu Zhiwei
Published: January 2022

We report a Brillouin laser in diamond based on a free-space doubly
resonant enhancement cavity. The resonator is pumped with 1064 nm
light, generating a pump-limited output power of 20.3 W with 33%
conversion efficiency.
Near Quantum Limited Slope Efficiency Nd:YLF4 Laser
Authors: de Almeida Vieira Tárcio , Prado Felipe Maia , Wetter Niklaus Ursus
Published: January 2022

We report on a Nd:YLF4 laser diode-side-pumped at 863 nm,
resulting in 75% slope efficiency and 13.8 W of CW output power.
Continuous Wave and Pulsed Modes of Operation of a High Power 2.09 µm Monolithic Single Oscillator Tm3+, Ho3+- Codoped Fiber Laser
Authors: Motard Arnaud , Louot Christophe , Manek-Hönninger Inka , Dalloz Nicolas , Hildenbrand-Dhollande Anne
Published: January 2022

We report on a high power monolithic single-oscillator Tm3+,
Ho3+-codoped polarization maintaining fiber laser emitting
at 2.09 µm in Continuous Wave and pulsed modes of operation by
Q-switching the laser cavity.
CW Cr2+:CdSe laser tunable from 2.7 to 3.1 µm for precise surgery
Authors: D.A. Nazarov , M.K. Tarabrin
Published: January 2022

We demonstrate a Cr2+:CdSe laser tunable in 2.7- 3.1 µm
spectral range using a birefringent filter for precise surgery. A
mathematical model for calculating appropriate Lyot filter was
developed.
High-energy Q-switched 25mJ Er:YAG and 75mJ Ho:YAG lasers at 1kHz repetition rate
Authors: Smolski Viktor , Moskalev Igor , Vasilyev Sergey , Peppers Jeremy , Mirov Mike , Fedorov Vladimir , Martyshkin Dmitry , Mirov Sergey , Gapontsev Valentin
Published: January 2022

We present recent results on 1645/1617 nm Er:YAG and 2090 nm Ho:YAG
laser systems optically pumped by efficient CW fiber lasers. Multi-mJ
pulse energy, MW-level peak powers are obtained in a range of
repetition rates.
Feasibility of Parametric Amplification of Ultrashort Laser Pulses by Ultrafast Marcuse Effect in Semiconductors
Authors: Gruzdev Vitaly
Published: January 2022

Theoretical analysis of stimulated inverse bremsstrahlung produced by
Coulomb-type scattering of free-electron plasma induced and pumped by
high-power femtosecond mid-infrared laser pulses suggests feasibility
of novel high-efficiency approaches to ultrafast parametric light
amplification in semiconductors.
Twisted Surface Homogenizer for Enhanced Diode-Pumping of Disk Lasers
Authors: Graham P. , Trela-McDonald N.
Published: January 2022

Diode bars provide an efficient a nd i nexpensive p ump s ource f or t
hin disc lasers. We demonstrate the use of a twisted gradient surface
to shape emitters of asymmetric intensity profile to a uniform beam at
focus.
Parallel Generation of Random Numbers Using a Broad-area Stable-cavity Semiconductor Laser
Authors: Kim Kyungduk , Bittner Stefan , Zeng Yongquan , Guazzotti Stefano , Hess Ortwin , Wang Qi Jie , Cao Hui
Published: January 2022

We demonstrate ultrafast random bit generation using spatio-temporal
interference of many modes in a specially-designed laser diode. Our
scheme produces 127 bit streams in parallel at a total bit rate of 250
terabits per second.
Hybrid Artificial Neural Networks (ANNs) and Analytical Model for Optical Constants of Nanostructured Materials
Authors: Joshi Shreeniket , Kiani Amirkianoosh
Published: January 2022

This study introduces a hybrid method, combining analytical models and
artificial neural networks (ANNs) for determining optical constants
with 95% accuracy as compared to the existing methods that are complex
and error prone.
3.5 ns pulse duration mJ level Ho:YAG laser
Authors: Bach Yechiel , Nahear Rotem , Noach Salman
Published: January 2022

Gain switched Ho:YAG laser at 2090 nm with 3.5 ns pulse duration, 0.82
mJ pulse energy at 0.67kHz is presented, this short pulse duration is
achieved by using high energy, passively Q- switched Tm:YLF laser
tuned to Ho:YAG absorption peak.
Automatic noise filtering for in situ imaging of high-power laser material processing
Authors: Krause Tessa J.H , Allen Troy R. , Bracken Declan K. , Fraser James M.
Published: January 2022

We present self-witnessing coherent imaging that reduces noise and
automatically removes imaging artifacts present in process monitoring.
Measurement rate is improved by 109 % for signal-starved
applications.
Development of Laser Shock Repeated Dense Peening (LSRDP) at High Repetition Rate
Authors: Rondepierre Alexandre , Rouchausse Yann , Casagrande Olivier , Castelnau Olivier , Simon-Boisson Christophe , Besaucelé Hervé , Berthe Laurent
Published: January 2022

Using most advanced Diode-Pumped Solid State laser architectures (1 J,
10 ns, 200 Hz), we have developed and optimized a high-frequency
configuration for Laser Shock Peening: small laser spots, high-overlap
ratios and without thermal coating.
Laser processing of microchannels in an antiresonant hollow-core fiber
Authors: Kozioł Paweł , Jaworski Piotr , Krzempek Karol , Hoppe Viktoria , Dudzik Grzegorz , Yu Fei , Wu Dakun , Liao Meisong , Abramski Krzysztof
Published: January 2022

We demonstrate fabrication of microchannels in the outer cladding of a
nodeless antiresonant hollow-core fiber (ARHCF) using developed
femtosecond laser-based micromachining process.
Design and Performance of a 100 J Pump Laser Front-end for Use in a 10 Hz PW-class Amplifier
Authors: Wojtusiak A. M. , Spear J. , Smith J. , Butcher T.
Published: January 2022

We present the front-end system for a diode-pumped solid state laser,
optimised specifically for pumping a 10 Hz PW-class amplifier. The
front-end provides 150 mJ, 1-15 ns pulses and has spatial and temporal
pulse-shaping capabilities.
Multi-Pass Cell Post-Compression for Pump-Probe Experiments at the FEL Facility FLASH
Authors: Viotti A.-L. , Seidel M. , Alisauskas S. , Escoto E. , Tünnermann H. , Dudde K. , Tajalli A. , Manschwetus B. , Hartl I. , Heyl C. M.
Published: January 2022

We present high-power Yb:YAG lasers combined with nonlinear pulse
compression in multi-pass cells. We show that these are suitable for
integration in FEL facilities in terms of pulse stability, jitter,
temporal contrast and intra-burst behaviour.
Hierarchical optical phased array for large scale beam combining and atmospheric correction
Authors: Sibley Paul G. , Bandutunga Chathura P. , Ireland Michael J. , Ward Robert L.
Published: January 2022

We present a hierarchical optical phased array design with adaptive
optics capabilities. The design allows for modular control over
emitter counts, supporting the large emitter count required for the
Breakthrough Starshot optical phased array.
Anisotropic Off-axis Laser Oscillator
Authors: Wu Ming-Hsiung , Lin Yan-Jou , Laurell Fredrik , Huang Yen-Chieh
Published: January 2022

By exploiting the anisotropic radiation pattern of an elementary dipole
in a laser material, we report a gain enhancement factor of
1.3104 for an off-axis Raman laser in a monolithic
y-cut versus z-cut KTP crystal.
Demonstration of the kilo-Watt strictly single-transverse-mode all-fiber laser
Authors: Huang Zhihe , Cao Jianqiu , Chen Maoni , Liu Aimin , Wang Meng , Chen Jinbao
Published: January 2022

A strictly single-transverse-mode all-fiber laser is demonstrated with
a 10-um core-diameter Yb-doped fiber. 1-kW output power is obtained
with the slope efficiency of 78% and no Raman component can be
observed in the output spectrum.
3kW Bi-Directional Pumped Single Mode Fiber Amplifier; Technical Challenges and Solutions
Authors: Rezaei-Nasirabad Reza , Azizi Saeed , Golshan Ali Hamedani , Abedinajafi Ali , Paygan Daniel , Tavassoli Mohammad , Roohforouz Ali , Eyni-Chenar Reza , Aghayari Ebrahim , Hejaz Kamran
Published: January 2022

In a high power fiber laser, power loss is reduced by eliminating the
intrinsic loss regards to the fiber components and the quality of high
power fiber splices are improved.
High-power coherent THz line emitter based on difference-frequency generation
Authors: Wu Ming-Hsiung , Kuo Chang-He , To Bao-Dong , Huang Yen-Chieh
Published: January 2022

We report the generation of 82-kW and 117-kW peak powers at 5.7 THz
external and internal to a Si prism coupler, respectively, of a pulsed
KTP difference frequency generator with a line-shape beam profile.
Cladding-pumped Low-quantum-defect Raman Laser Enabled by Boson Peak in Phosphorus-doped Fiber
Authors: Ma Xiaoya , Xu Jiangming , Ye Jun , Zhang Yang , Huang Liangjin , Leng Jinyong , Pan Zhiyong , Zhou Pu
Published: January 2022

We demonstrate a cladding-pumped phosphorus-doped Raman fiber laser
with quantum defect of 1.3%. Performances between core pumping and
cladding pumping are compared. After optimization, the output power
reaches 47.7 W with slope efficiency of 87.2%.
Temperature-Tuned Parametric Oscillation in CdSe
Authors: Miyata Kentaro , Kato Kiyoshi , Wada Satoshi , Petrov Valentin
Published: January 2022

Temperature tuning of CdSe optical parametric oscillators (OPO’s) is
studied by pumping with Nd:YAG laser-pumped CsTiOAsO4 OPO
outputs. The measured temperature-dependent phase-matching conditions
are used to construct new dispersion formulas for CdSe.
Engineering Micro-disk Resonators for Coupling to Dark and Bright Excitons in 2D Materials
Authors: Eswaramoorthy Lekshmi , Mokkapati Sudha , Kumar Anshuman
Published: January 2022

The coupling efficiency of a micro-disk with the dark excitons in an
atomically thin semiconductor is strengthened by Purcell enhanced
out-of-plane resonator modes. This work proposes the engineering of
these modes through the tapered disks.
Ceramics active media Er:Y2O3 and Er:Lu2O3 for gain-switched generation at 2.72 µm
Authors: Švejkar Richard , Šulc Jan , Němec Michal , Jelínková Helena
Published: January 2022

Er:Y2O3 and Er:Lu2O3
ceramics were used in compact resonator for laser generation in
gain-switching regime. The pulse duration 456 ns and 375 ns, and peak
power 2.99 W and 3.11 W were obtained with
Er:Y2O3 and Er:Lu2O3,
respectively.
Development of 1653.7nm DFB Laser for Methane Sensor
Authors: Xian Qingyun , Lv Hui , Yao Yucheng , Zhou Zhiqiang , Wang Renfan
Published: January 2022

A 1653.7nm DFB laser with multiple quantum Wells and ridged waveguide
structures was fabricated to detect methane. The device performance
has reached 54dB SMSR, 0.372 slope efficiency, saturated optical power
greater than 20mW.
Mirror-assisted tuning of laser stabilization via self-injection locking to WGM microresonator
Authors: Galiev R. R. , Kondratiev N. M. , Lobanov V. E. , Matsko A. B. , Bilenko I. A.
Published: January 2022

We derived a model for the mirror-assisted self-injection locking of a
laser to high-quality factor whispering gallery mode microresonator.
Based on the developed model the optimal regime of the laser
stabilization is found.
Design and Fabrication of LASER scribed Graphene-based Metamaterials
Authors: Mishra Arpita , Rani Sweta , Jaiswal Arun , Singh Gaurav , Shukla Shobha , Saxena Sumit
Published: January 2022

Graphene oxide-based thin films are constructed and subjected to LASER
light for photo reducing and patterning structures on them and are
studied to make building blocks for graphene-based metamaterials.
Two-photon Lithography of Cloaked Fluorescent Microstructures for Anti-counterfeiting Applications
Authors: Jaiswal Arun , Rani Sweta , Singh Gaurav Pratap , Saxena Sumit , Shukla Shobha
Published: January 2022

Two-photon polymerization assisted fabrication of fluorescene encoded,
cloaked nanopatterned labels, embedded in non emissive polymer bed has
been demonstrated for anti-counterfeiting application.
Self-mode locked ytterbium rod-type fiber laser yielding bandwidth limited and tunable picosecond pulses up to 25 W at 78 MHz
Authors: Ghawas M. , Müller L. , Freysz V. , Freysz E.
Published: January 2022

25 W self-modelocked fiber laser delivers picoseconds pulses at 78 MHz.
The spectral width and central frequency of almost Fourier transform
pulses are tunable between 0.38nm to 2.2nm and 1010nm to 1060nm,
respectively.
Noninvasive measurement of the vital signs of cancer patients with a dual-path microbend fiber sensor
Authors: Wang Ying , You Meizheng , Zhang Yanhong , Wu Sumei , Zhang Yi , Yang Huicheng , Zheng Ting , Chen Xiaohui , Chen Zhihao , Xie Xianhe , Zheng Xiaochun
Published: January 2022

A novel dual-path microbend fiber optic sensor is designed for
noninvasive measurement of respiratory rate (RR) and heart rate (HR)
for cancer patients. The performance of the microbend fiber sensor is
assessed in two groups of cancer patients, cancer patients with pain
and without pain, ranging from eighteen to ninety-six years old in a
daily observational measurement with the sensor mattress under the
mattress of the clinical bed. All the patients received standard
clinical monitoring for evaluating the accuracy of our measurement
results. The results of our study showed good consistency in the
experimental results of RR and HR between the dual-path fiber sensor
we proposed and the hospital equipment with average errors of 3.60
beats per minute (bpm) and 1.02 respiration per minute (rpm) in HR and
RR measurement in cancer patients with pain and 1.87bpm and 1.27rpm in
HR and RR measurement in cancer patients without pain, respectively.
In HR monitoring, the single path microbend fiber optic sensor has
8035 minutes of data with a false report rate of 19.09%, while
the dual-path microbend fiber optic sensor has 6188 minutes of data
with a false report rate of 12.87%. The dual-path sensor has a
smaller false report rate compared with the single path sensor due to
pre-judgments of data with path 1 and path 2. To our best knowledge,
it is the first time to propose and demonstrate a dual-path sensor to
reduce the false report rate for HR and RR measurements. The results
of the Blend-Altman method showed great agreement between our sensor
and hospital standard monitor in HR and RR measurements. The
independent sample t-test indicates that the HR of cancer patients may
be an effective way to judge whether or not they have cancer pain. Our
noninvasive dual-path microbend fiber sensor also showed the
advantages of an easy fabrication process, simple structure, and low
false report rate.
Image enhancement in acoustic-resolution photoacoustic microscopy enabled by a novel directional algorithm
Authors: Feng Fei , Liang Siqi , Chen Sung-Liang
Published: January 2022

By considering the line pattern of acoustic-resolution photoacoustic microscopy (AR-PAM) vessel images, we develop modified algorithms for synthetic aperture focusing technique (SAFT) and deconvolution based on a directional approach to enhance images. The modified algorithms consist of Fourier accumulation SAFT (FA-SAFT) and directional model-based (D-MB) deconvolution. To evaluate the performance of our algorithms, we conduct a series of imaging experiments and apply our algorithms, and existing SAFT and deconvolution algorithms are also applied for side-by-side comparison. By imaging tungsten wire phantom, our algorithms enable full width at half maximum of 26 − 31 µm over depth of focus of 1.8 mm and minimum resolvable distance of 46 − 49 µm, besting existing SAFT and deconvolution algorithms. Imaging of leaf skeleton phantom and in vivo imaging of mouse blood vessels also prove that our algorithm is capable of providing high-resolution, high-signal-to-noise ratio, and good-fidelity results for complex structures and for in vivo applications, especially for the images with the line pattern. The proposed directional approach can not only be used in AR-PAM but also in other imaging modalities to deal with the line pattern, such as FA-SAFT for ultrasound imaging and D-MB deconvolution for optical coherence tomography angiography.
Multi-mJ Pulse Self-compression to 10 fs in a 2 cm Kr Filled Compact Hollow Core Waveguide
Authors: Ran Qiandong , Li Hao , Wang Qi Jie , Zhang Ying
Published: January 2022

Broad spectrum supporting sub-10 fs pulses was generated from a 2 cm Kr filled hollow core waveguide. Multi-mJ pulses were compressed to 10.5 fs by self-compression without using any phase compensation optics.
Discretized X-Wave in a Multimode Optical Fiber
Authors: Stefańska Karolina , Béjot Pierre , Tarnowski Karol , Kibler Bertrand
Published: January 2022

We numerically and experimentally demonstrate the spontaneous emergence of conical waves when an ultrashort pulse propagates nonlinearly in a multimode fiber, i.e. a discretization of conical emission phenomenon (e.g., X-wave) in bulk media.
Terahertz Transverse Magnetism in Subwavelength Grating-Coupled Hybrid Plasmonic Systems
Authors: Karmakar Subhajit , Varshney Ravendra K. , Chowdhury Dibakar Roy
Published: January 2022

We propose an effective mechanism to induce transverse magnetic moment in plasmonic gratings coupled with subwavelength dipole rods. Artificial magnetism in plasmonic wire gratings may lead to efficient hybrid system for THz magnetic applications.
Interaction of Twisted Light with Metal Tips
Authors: Sinha Abhisek , Rajak Debobrata , Rani Shilpa , Gopal Ram , Sharma Vandana
Published: January 2022

A study of the interaction of Laguerre-Gaussian (LG) beams with Tungsten tips. A change in the order of the interaction for LG beams compared to Gaussian beams is reported.
Micro-hole drilling of transparent materials with ultra-fast Bessel beam
Authors: Belloni V. V. , Sabonis V. , Eaton S. M. , Bollani M. , Di Trapani P. , Jedrkiewicz O.
Published: January 2022

We study micro-hole drilling in transparent materials with ultra-fast Bessel beam in single pulse mode and burst mode. We apply this technique to samples with thickness up to 500 μm and of different materials.
CEP-stable Infrared OPCPA Sources
Authors: Thiré Nicolas , Maksimenka Raman , Pertot Yoann , Villanueva José , Pinoteau Thomas , Forget Nicolas
Published: January 2022

We review several optical parametric chirped-pulse (OPCPA) systems designed to achieve extreme carrier-envelope phase (CEP) stability and/or spectral tunability in the infrared. The common architecture of these OPCPAs combines a “self-seeded” difference-frequency stage with active CEP stabilization. We demonstrate the compatibility of this architecture with a set of high-power Ytterbium pump lasers based on different amplification technologies (bulk, rod-type, thin-disk, InnoSlab).
Generation of extremely high cone angle Bessel beam
Authors: Belloni Valeria V. , Froehly Luc , Billet Cyril , Furfaro Luca , Courvoisier Francois
Published: January 2022

We present a new method for the generation of extremely high angle Bessel beams. We report the simulations and experimental results where we reach 43 degrees cone angle at a wavelength of 980 nm.
Active Control of Picosecond Pulse Pumped Supercontinuum Generation in Silicon-nanocrystal-based Slot Waveguide
Authors: Lin Kaibin , Li Qian
Published: January 2022

We numerically demonstrate the active control of the picosecond pulse pumped supercontinuum generation in silicon-nanocrystal-based slot waveguide.
Utilizing object asymmetry in the phase retrieval algorithm
Authors: Gautam Surya Kumar , Naik Dinesh N
Published: January 2022

Object autocorrelation obtained from the far field intensity pattern of the asymmetric object contains the object features. This fact is utilized here in the phase retrieval algorithm to remove the twin image problem.
Vortex laser generation with controllable topological charges in a spiral phase defect resonator
Authors: Lin Yuan-Yao , Lee Yu-Wei
Published: January 2022

We propose an optical cavity with spiral phase defect for particular vortex laser generation. Utilizing a reflective spatial light modulator that creates variable spiral phase defect, vortex beams with controllable topological charges are demonstrated.
Efficient sorting for an orbital angular momentum multiplexing communication link based on a digital micromirror device and a diffuser
Authors: Zhang Zhaoyuan , Yin Xiaoli , Liu Yuhang , Wang Yongjun , Xin Xiangjun
Published: January 2022

Efficient sorting multiple orbital angular momentum (OAM) spatial modes is a significant step in OAM multiplexing communications. Recently, wavefront shaping (WS) techniques have been implemented to manipulate light scattering through a diffuser. We reported a novel scheme for sorting multiplexed OAM modes faster and more accurately, using the complex amplitude WS based on a digital micromirror device (DMD) through a diffuser to shape the full field (phase and amplitude) of the OAM modes. In this study, we simulate this complex sorter for demultiplexing multiple modes and make a performance comparison with the previous sorter using the phase-only WS. Our results showed that for arbitrary two multiplexed modes, the sorter could achieve a high detection probability of more than 0.99. As the number of the multiplexed modes increases, the detection probability decreases to ∼0.82 when sorting seven modes, which contrasts the ∼0.71 of the phase-only sorters. We also experimentally verified the feasibility, that for arbitrary two modes, the sorter could reach a high detection probability of more than 0.99, and the complex sorter is capable of higher detection probability than the phase-only sorter under the same conditions. Hence, we anticipate that this sorter may potentially be demultiplexing multiple OAM spatial modes efficiently and quickly.
Ray-optics study of gentle non-conformal texture morphologies for perovskite/silicon tandems
Authors: Santbergen Rudi , Vogt Malte R. , Mishima Ryota , Hino Masashi , Uzu Hisashi , Adachi Daisuke , Yamamoto Kenji , Zeman Miro , Isabella Olindo
Published: January 2022

We investigate gentle front side textures for perovskite/silicon tandem solar cells. These textures enhance the absorption of sunlight, yet are sufficiently gentle to allow deposition of an efficient perovskite top cell. We present a tandem solar cell with such gentle texture, fabricated by Kaneka corporation, with an efficiency as high as 28.6%. We perform an extensive ray-optics study, exploring non-conformal textures at the front and rear side of the perovskite layer. Our results reveal that a gentle texture with steepness of only 23° can be more optically efficient than conventional textures with more than double that steepness. We also show that the observed anti-reflective effect of such gentle textures is not based a double bounce, but on light trapping by total internal reflection. As a result, the optical effects of the encapsulation layers play an important role, and have to be accounted for when evaluating the texture design for perovskite/silicon tandems.
Holographic display with optical computational Fresnel convolution to broaden distance
Authors: Wang Jun , Lei Xiangli , Wu Yang , Jin Fengming , Chen Ni
Published: January 2022

As a method of near-field diffraction in the condition of the paraxial approximation, the Fresnel convolution (FR-CV) method is widely used in hologram generation and other applications. However, it is applicable to near-field diffraction, and the quality of holographic reconstruction degrades seriously with the increase of diffraction distance. Moreover, its hologram generation speed is limited due to the use of three fast Fourier transforms in the convolution operation. Nevertheless, there are also many application scenarios that need longer distance diffraction. To achieve a holographic display in broadened distance with high generation speed and reconstruction quality, an optical computational Fresnel convolution method is proposed in this paper. Since an optical Fourier lens is used to perform optical calculations for Fourier transforms in our proposed method, the hologram generation speed of the proposed method is approximately 8 times faster than that of the FR-CV method. Moreover, the reconstructed image with our proposed method can be successfully and clearly displayed at both short and longer diffraction distance by changing focal lengths of the Fourier lens. The effectiveness and superiority of the proposed method have been validated by both numerical simulations and optical experiments.
Wide-angle and broadband solar absorber made using highly efficient large-area fabrication strategy
Authors: Hou Wenjie , Yang Fan , Chen Zeming , Dong Jianwen , Jiang Shaoji
Published: January 2022

High performance and cost-effective solar absorbers are crucial for various optical applications, such as solar collection and thermophotovoltaic devices. This study designs and experimentally demonstrates a wide-angle and broadband solar absorber. The proposed absorber is composed of tapered polyimide substrate and Al-Cr-SiO2-Cr-SiO2 thin-film based on the optical interference of the multilayer thin film and excited magnetic resonance of light-trapping structures. The composite process of the colloidal lithography method and magnetron sputtering is employed for efficient fabrication in a large area. The average absorbance is more than 93% from 300 nm to 2500 nm and shows an angular tolerance of up to 60°. The high efficiency and large-area fabrication capability demonstrated by the proposed solar absorber presents future application potential in flexible solar collection devices.
State-vector geometry and guided-wave physics behind optical super-resolution
Authors: Zheltikov Aleksei M.
Published: January 2022

We examine the state-vector geometry and guided-wave physics underpinning spatial super-resolution, which can be attained in far-field linear microscopy via a combination of statistical analysis, quantum optics, and spatial mode demultiplexing. A suitably tailored guided-wave signal pickup is shown to provide an information channel that can distill the super-resolving spatial modes, thus enabling an estimation of sub-Rayleigh space intervals ξ. We derive closed-form analytical expressions describing the distribution of the ξ-estimation Fisher information over waveguide modes, showing that this information remains nonvanishing as ξ → 0, thus preventing the variance of ξ estimation from diverging at ξ → 0. We demonstrate that the transverse refractive index profile n
Q
(r) tailored to support the optimal wave function ψ
Q
(r) for super-resolving ξ estimation encodes the same information about ξ as the entire manifold of waveguide modes needed to represent ψ
Q
(r). Unlike ψ
Q
(r), n
Q
(r) does not need a representation in a lengthy manifold of eigenmodes and can be found instead via adaptive feedback-controlled learning.
Extended ensemble simulations of a SARS-CoV-2 nsp1–5’-UTR complex
Authors: Sakuraba Shun , Xie Qilin , Kasahara Kota , Iwakiri Junichi , Kono Hidetoshi
Published: January 2022

Nonstructural protein 1 (nsp1) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a 180-residue protein that blocks translation of host mRNAs in SARS-CoV-2-infected cells. Although it is known that SARS-CoV-2’s own RNA evades nsp1’s host translation shutoff, the molecular mechanism underlying the evasion was poorly understood. We performed an extended ensemble molecular dynamics simulation to investigate the mechanism of the viral RNA evasion. Simulation results suggested that the stem loop structure of the SARS-CoV-2 RNA 5’-untranslated region (SL1) binds to both nsp1’s N-terminal globular region and intrinsically disordered region. The consistency of the results was assessed by modeling nsp1-40S ribosome structure based on reported nsp1 experiments, including the X-ray crystallographic structure analysis, the cryo-EM electron density map, and cross-linking experiments. The SL1 binding region predicted from the simulation was open to the solvent, yet the ribosome could interact with SL1. Cluster analysis of the binding mode and detailed analysis of the binding poses suggest residues Arg124, Lys47, Arg43, and Asn126 may be involved in the SL1 recognition mechanism, consistent with the existing mutational analysis.
Selective publication of antidepressant trials and its influence on apparent efficacy: Updated comparisons and meta-analyses of newer versus older trials
Authors: Turner Erick H. , Cipriani Andrea , Furukawa Toshi A. , Salanti Georgia , de Vries Ymkje Anna
Published: January 2022

Background

Valid assessment of drug efficacy and safety requires an evidence base free of reporting bias. Using trial reports in Food and Drug Administration (FDA) drug approval packages as a gold standard, we previously found that the published literature inflated the apparent efficacy of antidepressant drugs. The objective of the current study was to determine whether this has improved with recently approved drugs.

Methods and findings

Using medical and statistical reviews in FDA drug approval packages, we identified 30 Phase II/III double-blind placebo-controlled acute monotherapy trials, involving 13,747 patients, of desvenlafaxine, vilazodone, levomilnacipran, and vortioxetine; we then identified corresponding published reports. We compared the data from this newer cohort of antidepressants (approved February 2008 to September 2013) with the previously published dataset on 74 trials of 12 older antidepressants (approved December 1987 to August 2002).

Using logistic regression, we examined the effects of trial outcome and trial cohort (newer versus older) on transparent reporting (whether published and FDA conclusions agreed). Among newer antidepressants, transparent publication occurred more with positive (15/15 = 100%) than negative (7/15 = 47%) trials (OR 35.1, CI95% 1.8 to 693). Controlling for trial outcome, transparent publication occurred more with newer than older trials (OR 6.6, CI95% 1.6 to 26.4). Within negative trials, transparent reporting increased from 11% to 47%.

We also conducted and contrasted FDA- and journal-based meta-analyses. For newer antidepressants, FDA-based effect size (ESFDA) was 0.24 (CI95% 0.18 to 0.30), while journal-based effect size (ESJournals) was 0.29 (CI95% 0.23 to 0.36). Thus, effect size inflation, presumably due to reporting bias, was 0.05, less than for older antidepressants (0.10).

Limitations of this study include a small number of trials and drugs—belonging to a single class—and a focus on efficacy (versus safety).

Conclusions

Reporting bias persists but appears to have diminished for newer, compared to older, antidepressants. Continued efforts are needed to further improve transparency in the scientific literature.