Tunable Doppler shift using a time-varying epsilon-near-zero thin film near 1550??nm
We experimentally investigate the tunable Doppler shift in an 80 nm thick indium-tin-oxide (ITO) film at its epsilon-near-zero (ENZ) ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Cong Liu M. Zahirul Alam Kai Pang Karapet Manukyan Joshua R. Hendrickson Evan M. Smith Yiyu Zhou Orad Reshef Hao Song Runzhou Zhang Haoqian Song Fatemeh Alishahi Ahmad Fallahpour Ahmed Almaiman Robert W. Boyd Moshe Tur Alan E. Willner Source Type: research

Millimeter-level recognition capability of BOTDA based on a transient pump pulse and algorithm enhancement
Brillouin optical time-domain analysis requires a pulsed pump to obtain a distributed Brillouin gain spectrum (BGS) containing ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Dengwang Zhou Dexin Ba Benzhang Wang Liqiang Qiu Wuliji Hasi Yongkang Dong Source Type: research

Near-octave-spanning breathing soliton crystal in an AlN microresonator
The soliton crystal (SC) was recently discovered as an extraordinary Kerr soliton state with regularly distributed soliton pulses and ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Haizhong Weng Adnan Ali Afridi Jia Liu Jing Li Jiangnan Dai Xiang Ma Yi Zhang Qiaoyin Lu Weihua Guo John F. Donegan Source Type: research

Kilowatt level Raman amplifier based on 100?? µ m core diameter multimode GRIN fiber with M^2 = 1.6
In this Letter, we demonstrate a high-power Raman fiber amplifier with excellent beam quality based on graded-index fiber. The Yb-doped ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Chenchen Fan Hu Xiao Tianfu Yao Jiangming Xu Yizhu Chen Jinyong Leng Pu Zhou Source Type: research

Kerr-lens mode-locked Tm-doped sesquioxide ceramic laser
Kerr-lens mode-locked solid-state laser operation at ∼ 2 µ m is investigated. Using a Tm^3+-doped (Lu,Sc)_2O_3 ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Yongguang Zhao Li Wang Weidong Chen Pavel Loiko Yicheng Wang Zhongben Pan Hanlin Yang Wei Jing Hui Huang Jiachen Liu Xavier Mateos Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov Source Type: research

Light field microscopy based on structured light illumination
In this Letter, we present the modeling, design, and characterization of a light sheet-based structured light illumination (SLI) light ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Zhiqiang Fu Qiang Geng Jialong Chen Li-An Chu Ann-Shyn Chiang Shih-Chi Chen Source Type: research

Broadband (8.5 – 13.5?? µ m) intra-pulse difference frequency generation in a LiGaS_2 crystal of a 90??fs 744??nm laser pulse after its continuous redshift in air
Broadband frequency downconversion of a 90 fs 744 nm Ti:sapphire laser pulse into the mid-infrared (IR) was demonstrated via its ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Ya. V. Grudtsyn I. O. Kinyaevskiy A. V. Koribut L. V. Seleznev Yu. A. Gerasimova A. A. Rogashevskii A. A. Ionin Source Type: research

Engineering the spectral bandwidth of quantum cascade laser frequency combs
Quantum cascade lasers (QCLs) facilitate compact optical frequency comb sources that operate in the mid-infrared and terahertz spectral ... (Source: Optics Letters)
Source: Optics Letters - July 14, 2021 Category: Physics Authors: Maximilian Beiser Nikola Opa č ak Johannes Hillbrand Gottfried Strasser Benedikt Schwarz Source Type: research

Imaging spectrometer with single component of freeform concave grating
In this Letter, an imaging spectrometer in which a freeform concave grating is the only optical component in the system is introduced. The ... (Source: Optics Letters)
Source: Optics Letters - July 12, 2021 Category: Physics Authors: Benqi Zhang Yilin Tan Guofan Jin Jun Zhu Source Type: research

Ultra-thin Si-padded Si_3N_4 waveguides for low-loss photonics
We proposed an ultra-thin Si-padded Si_3N_4 waveguide consisting of a very thin Si slab underneath a Si_3N_4 strip separated by a SiO_2 ... (Source: Optics Letters)
Source: Optics Letters - July 12, 2021 Category: Physics Authors: The Anh Nguyen Ming-Chang M. Lee Source Type: research

Extremely enhanced N_2^+ lasing in a filamentary plasma grating in ambient air
Cavity-free air lasing offers a promising route towards the realization of atmospheric lasers for various applications such as remote ... (Source: Optics Letters)
Source: Optics Letters - July 12, 2021 Category: Physics Authors: Yao Fu Jincheng Cao Siqi Wang Shanming Chen Hongwei Zang Helong Li Erik L ö tstedt Toshiaki Ando Atsushi Iwasaki Kaoru Yamanouchi Huailiang Xu Source Type: research

Frequency-scanned microresonator soliton comb with tracking of the frequency of all comb modes
Rapid and large scanning of a dissipative Kerr-microresonator soliton comb with characterization of all comb modes along with the ... (Source: Optics Letters)
Source: Optics Letters - July 12, 2021 Category: Physics Authors: Naoya Kuse Gabriele Navickaite Michael Geiselmann Takeshi Yasui Kaoru Minoshima Source Type: research

Terahertz anisotropic response of additively manufactured one-dimensional photonic crystals
A polymer-based, one-dimensional photonic crystal exhibiting anisotropic responses was demonstrated in the terahertz frequency range. The ... (Source: Optics Letters)
Source: Optics Letters - July 9, 2021 Category: Physics Authors: Serang Park V. Paige Stinson Glenn D. Boreman Tino Hofmann Source Type: research

In vivo measurement of the lineal density of red blood cells in human retinal capillaries using high-speed adaptive optics ophthalmoscopy
We present an automated method for measuring the lineal density of red blood cells (RBCs) in human retinal capillaries using adaptive ... (Source: Optics Letters)
Source: Optics Letters - July 9, 2021 Category: Physics Authors: Boyu Gu David Sarraf Michael Ip Srinivas R. Sadda Yuhua Zhang Source Type: research

Multiple-view D^2NNs array: realizing robust 3D object recognition
As an optical-based classifier of the physical neural network, the independent diffractive deep neural network (D^2NN) can be utilized to ... (Source: Optics Letters)
Source: Optics Letters - July 9, 2021 Category: Physics Authors: Jiashuo Shi Liang Zhou Taige Liu Chai Hu Kewei Liu Jun Luo Haiwei Wang Changsheng Xie Xinyu Zhang Source Type: research

High-entropy chaos generation using semiconductor lasers subject to intensity-modulated optical injection for certified physical random number generation
This study investigates high-entropy chaos generation using a semiconductor laser subject to intensity-modulated optical injection for ... (Source: Optics Letters)
Source: Optics Letters - July 9, 2021 Category: Physics Authors: Chin-Hao Tseng Ryo Funabashi Kazutaka Kanno Atsushi Uchida Chia-Chien Wei Sheng-Kwang Hwang Source Type: research

Raman wavelength conversion in a multipass cell
Positively chirped femtosecond pulses at 1030 nm are wavelength-converted using spontaneous and stimulated Raman scattering in a potassium ... (Source: Optics Letters)
Source: Optics Letters - July 9, 2021 Category: Physics Authors: Nour Daher Xavier D é len Florent Guichard Marc Hanna Patrick Georges Source Type: research

Liquid crystal microlenses based on binary surface alignment controlled by focused ion beam treatment
We report the formation of high optical power microlenses in the near-surface region of the liquid crystal layer. Such microlenses, ... (Source: Optics Letters)
Source: Optics Letters - July 8, 2021 Category: Physics Authors: Serguei P. Palto Artur R. Geivandov Irina V. Kasyanova Ivan V. Simdyankin Vladimir V. Artemov Maxim V. Gorkunov Source Type: research

Real-time ultrasound sensing with a mode-optimized photonic crystal slab
Integrated photonic sensors can provide large scale, flexible detection schemes. Photonic crystal slabs (PCSs) offer a miniaturized ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: Eric Y. Zhu Maria Charles-Herrera Cory Rewcastle Raanan Gad Li Qian Ofer Levi Source Type: research

Geometric shaping optimization of 64-APSK constellation in discrete nonlinear frequency division multiplexing systems
We experimentally demonstrated a geometric shaped (GS) 64-ary amplitude phase shift keying (64-APSK) eigenvalue transmission. The signal is ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: Junda Chen Yizhao Chen Yuxiang Duan Xuefeng Wang Li Wang Tianhao Tong Yating Xiang Can Zhao Deming Liu Ming Tang Source Type: research

Magneto-optical Kerr effect measurement in ultrafast Sagnac interferometry using the Jones matrix approach
We report the Jones matrix formalism of the magneto-optic Kerr effect (MOKE) for ferromagnets using an ultrafast Sagnac interferometer. ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: Yooleemi Shin Ji-Wan Kim Source Type: research

Efficient optical-to-terahertz conversion in large-area InGaAs photo-Dember emitters with increased indium content
In this Letter, optical-to-terahertz (THz) conversion of 800 nm femtosecond laser pulses in large-area bias-free InGaAs emitters based on ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: I. E. Ilyakov B. V. Shishkin V. L. Malevich D. S. Ponomarev R. R. Galiev A. Yu. Pavlov A. E. Yachmenev S. P. Kovalev M. Chen R. A. Akhmedzhanov R. A. Khabibullin Source Type: research

Avoidance of four-wave mixing in optical fiber bundle for coherent anti-Stokes Raman scattering endomicroscopy
We propose and demonstrate a method of suppressing four-wave mixing (FWM) in an optical fiber bundle to realize coherent anti-Stokes Raman ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: Hiroki Ogawa Mamoru Hashimoto Source Type: research

Three-dimensional nanothermometry below the diffraction limit
Lanthanide-doped nanothermometers are used to measure temperature through changes in their emission characteristic with sensitivities of up ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: J. Thiem S. Spelthann J. Neumann A. Ruehl D. Ristau Source Type: research

Non-line-of-sight optical camera communication aided by a pilot
Currently, optical camera communication (OCC), as an emerging network access mode for the fifth-generation (5G), is valued for its ... (Source: Optics Letters)
Source: Optics Letters - July 6, 2021 Category: Physics Authors: Shao-Qi Chen Xue-Fen Chi Te-Yu Li Source Type: research

Nonlinear fiber system for shot-noise limited intensity noise suppression and amplification
We propose a nonlinear fiber system for shot-noise limited, all-optical intensity noise reduction and signal amplification. The mechanism ... (Source: Optics Letters)
Source: Optics Letters - July 2, 2021 Category: Physics Authors: Marvin Edelmann Yi Hua Kemal Ş afak Franz X. K ä rtner Source Type: research

Mode converter with C+L band coverage based on the femtosecond laser inscribed long period fiber grating
The mode converter (MC) is one of the key components for mode division multiplexing (MDM). Here, we experimentally demonstrate an all-fiber ... (Source: Optics Letters)
Source: Optics Letters - July 2, 2021 Category: Physics Authors: Cailong Yang Cong Zhang Songnian Fu Lei Shen Yuncai Wang Yuwen Qin Source Type: research

Self-starting triple-wavelength vector dark soliton with a bismuth-doped fiber saturable absorber
We report on the generation of a triple-wavelength vector dark soliton in an all-fiber ring cavity of erbium-doped fiber laser mode-locked ... (Source: Optics Letters)
Source: Optics Letters - July 2, 2021 Category: Physics Authors: Pei Zhang Bilal Nizamani Mustafa Mohammed Najm Kaharudin Dimyati Moh Yasin Sulaiman Wadi Harun Source Type: research

Fractional orbital angular momentum conversion in second-harmonic generation with an asymmetric perfect vortex beam
This Letter demonstrates the nonlinear conversion of asymmetric perfect vortex (APV) beams with fractional orbital angular momentum (OAM). ... (Source: Optics Letters)
Source: Optics Letters - July 2, 2021 Category: Physics Authors: Kunjian Dai J. Keith Miller Wenzhe Li Richard J. Watkins Eric G. Johnson Source Type: research

Compact, self-aligned focusing schlieren system
A novel, to the best of our knowledge, compact, self-aligned focusing schlieren system is presented that eliminates the need for a separate ... (Source: Optics Letters)
Source: Optics Letters - July 2, 2021 Category: Physics Authors: Brett F. Bathel Joshua M. Weisberger Source Type: research

Temperature-compensated optical fiber sensor for volatile organic compound gas detection based on cholesteric liquid crystal
External temperature variations inevitably affect the accuracy of a liquid crystal sensor. Therefore, we propose a novel ... (Source: Optics Letters)
Source: Optics Letters - July 2, 2021 Category: Physics Authors: Jianyang Hu Yuzhou Chen Zhenyu Ma Li Zeng Dong Zhou Zenghui Peng Weimin Sun Yongjun Liu Source Type: research

High-spectral-resolution lidar for measuring tropospheric temperature profiles by means of Rayleigh – Brillouin scattering
A novel high-spectral-resolution lidar receiver based on a Fizeau interferometer and a photomultiplier tube array for tropospheric ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Jiaqi Xu Benjamin Witschas Pau Gomez Kabelka Kun Liang Source Type: research

Planar GeSn lateral p-i-n resonant-cavity-enhanced photodetectors for short-wave infrared integrated photonics
We report normal-incidence planar GeSn resonant-cavity-enhanced photodetectors (RCE-PDs) with a lateral p-i-n homojunction configuration on ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Chen-Yang Chang Radhika Bansal Kuo-Chih Lee Greg Sun Richard Soref H. H. Cheng Guo-En Chang Source Type: research

Weak beam self-cleaning of femtosecond pulses in the anomalous dispersion regime
Kerr beam cleaning in graded-index multimode fiber has been investigated in experiments with sub-nanosecond pulses and in experiments with ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Yuhang Wu Hamed Pourbeyram Demetrios N. Christodoulides Frank W. Wise Source Type: research

High-efficiency dual-band-multiplexing three-port grating coupler on 220-nm silicon-on-insulator with 248-nm deep-UV lithography
We experimentally demonstrate a novel, to the best of our knowledge, three-port grating coupler (TPGC) for dual-wavelength-band operation. ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Lirong Cheng Simei Mao Zhi Li Xin Tu H. Y. Fu Source Type: research

Ratiometric photon reassignment based on fluorescence lifetime to improve resolution in pulse STED microscopy
Depletion beams with long pulse durations ( ∼ 600ps) have recently been applied in stimulated emission depletion (STED) microscopy to ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Shaocong Liu Zhimin Zhang Yubing Han Lu Yang Cuifang Kuang Xu Liu Source Type: research

Sub-bandgap absorption and photo-response of molybdenum heavily doped black silicon fabricated by a femtosecond laser
Molybdenum (Mo)-doped black silicon (Si) is obtained by using femtosecond laser irradiation. The concentration of Mo atoms at the depth ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Yang Yang Ji-Hong Zhao Chao Li Qi-Dai Chen Zhan-Guo Chen Hong-Bo Sun Source Type: research

Highly sensitive detecting system to precisely evaluate the emission spectra and quantum efficiency of organic crystal light-emitting transistors
The lack of a reliable and sensitive measure system has strongly hindered the progress of organic single-crystal light-emitting ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Jian Deng Yan Wang Cheng Gu Yuguang Ma Source Type: research

Photonic lantern tip/tilt detector for adaptive optics systems
In this work, we demonstrate a four-core multicore fiber photonic lantern tip/tilt wavefront sensor. To diagnose the low-order Zernike ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Daniel Cruz-Delgado Juan Carlos Alvarado-Zacarias Matthew A. Cooper Steffen Wittek Caleb Dobias Julian Martinez-Mercado Jose E. Antonio-Lopez Nicolas K. Fontaine Rodrigo Amezcua-Correa Source Type: research

High-speed visible supercontinuum laser absorption spectroscopy of metal oxides
Supercontinuum laser absorption spectroscopy is applied to energetic material combustion fireball environments using the visible spectrum ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Anthony C. LoCurto Michael A. Welch Travis R. Sippel James B. Michael Source Type: research

Twin lossy mode resonance on a single D-shaped optical fiber
This Letter presents the fabrication of dual lossy mode resonance (LMR) refractometers based on titanium dioxide (TiO_2) and tin oxide ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: J. J. Imas C. R. Zamarre ñ o P. Zubiate I. Del Villar J. M. P é rez-Escudero I. R. Mat í as Source Type: research

Acoustic-resolution photoacoustic microscopy based on an optically transparent focused transducer with a high numerical aperture
This Letter reports acoustic-resolution-photoacoustic microscopy (AR-PAM) based on a new optically transparent focused polyvinylidene ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Cheng Fang Jun Zou Source Type: research

Material platform for realization of a “ fiber-like ” lossy mode resonance response in a simple Kretschmann – Raether geometry: publisher ’ s note
This publisher ’ s note contains corrections to Opt. Lett.46, 3065 (2021).OPLEDP0146-959210.1364/OL.431787 (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Sumit Goswami Ashwini Kumar Sharma Source Type: research

On-chip erbium-doped lithium niobate microring lasers
Lithium niobate on insulator (LNOI), regarded as an important candidate platform for optical integration due to its excellent nonlinear, ... (Source: Optics Letters)
Source: Optics Letters - July 1, 2021 Category: Physics Authors: Qiang Luo Chen Yang Ru Zhang Zhenzhong Hao Dahuai Zheng Hongde Liu Xuanyi Yu Feng Gao Fang Bo Yongfa Kong Guoquan Zhang Jingjun Xu Source Type: research

AlGaN-based deep ultraviolet micro-LED emitting at 275 nm
The investigation of electrical and optical properties of micro-scale AlGaN deep ultraviolet (DUV) light-emitting diodes (LEDs) emitting at ... (Source: Optics Letters)
Source: Optics Letters - June 29, 2021 Category: Physics Authors: Huabin Yu Muhammad Hunain Memon Danhao Wang Zhongjie Ren Haochen Zhang Chen Huang Meng Tian Haiding Sun Shibing Long Source Type: research

Symmetry-breaking bifurcations and ghost states in the fractional nonlinear Schr ö dinger equation with a PT-symmetric potential
We report symmetry-breaking and restoring bifurcations of solitons in a fractional Schr ö dinger equation with cubic or ... (Source: Optics Letters)
Source: Optics Letters - June 29, 2021 Category: Physics Authors: Pengfei Li Boris A. Malomed Dumitru Mihalache Source Type: research

Learning-based self-calibration for correcting lateral and axial field distortions in 3D surface topography measurement
A learning-based self-calibration method is demonstrated to achieve simultaneous corrections for both lateral and axial field distortions ... (Source: Optics Letters)
Source: Optics Letters - June 29, 2021 Category: Physics Authors: Xiaoyu You Yuhang Wang Yifei Li Jian Liu Kang Gu Source Type: research

Polarization-selective absorption in an off-centered core-shell square quantum wire
Core-shell nanostructures are highly attractive; their electrical and optical properties can be tuned by engineering their shapes and types ... (Source: Optics Letters)
Source: Optics Letters - June 29, 2021 Category: Physics Authors: Verasak Thongnak Jirarut Joonhuay Attapon Amthong Source Type: research

Cross-phase modulation aberrations in time lenses
We study the aberrations of four-wave mixing based time lenses resulting from the cross-phase modulations of the pump wave. These temporal ... (Source: Optics Letters)
Source: Optics Letters - June 29, 2021 Category: Physics Authors: Hamootal Duadi Avi Klein Inbar Sibony Sara Meir Moti Fridman Source Type: research

Modulation bandwidth enhanced self-injection locking laser with an external high-Q microring reflector
We propose and demonstrate a hybrid modulation bandwidth enhanced self-injection locking laser by butt coupling a commercial distributed ... (Source: Optics Letters)
Source: Optics Letters - June 29, 2021 Category: Physics Authors: Shuai Shao Jiachen Li Yunhao Wu Sigang Yang Hongwei Chen Minghua Chen Source Type: research