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Computational modeling of Chlamydomonas reinhardtii cellular radiation properties with synergistic consideration of complex structures and compositions Opt. Express (IF 3.8) Pub Date : 2024-03-14 Li Lin, Miao Jiang, Xingcan Li, and Jia-Yue Yang
The radiation characteristics of microalgae are of great significance for the design of photobioreactors and ocean optical remote sensing. Yet the complex structure of microalgae makes it difficult to theoretically predict its radiation characteristics based on traditional Mie theory. In this work, taking Chlamydomonas reinhardtii as an example, a multi-component cell model with a complex structure
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Research on distributed strain monitoring of a bridge based on a strained optical cable with weak fiber Bragg grating array Opt. Express (IF 3.8) Pub Date : 2024-03-14 Lina Yue, Qing Wang, Fang Liu, Qiuming Nan, Guanghui He, and Sheng Li
The foundation of an intelligent highway network is the construction of a high-density distributed strain monitoring system, which is based on sensing elements that can sensitively capture external information. In this research, the development and application for the structure of a novel strained optical fiber cable based on the weak fiber Bragg grating (wFBG) arrays are discussed. A modulation and
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Compact and low-insertion-loss polarization beam-splitting multimode filter using pixelated waveguides Opt. Express (IF 3.8) Pub Date : 2024-03-15 Lingxiao Ma, Tao Jin, Runkui Yao, Pengjun Wang, Qiang Fu, Weiwei Chen, Shixun Dai, Dejun Kong, Jian Lin, Haoqi Chen, Jun Li, Tingge Dai, and Jianyi Yang
A polarization beam-splitting multimode filter using pixelated waveguides has been presented and experimentally demonstrated in this paper. Finite difference time domain method and direct binary search optimization algorithm are employed to optimize pixelated waveguides to realize compact size, broad bandwidth, large extinction ratio, low insertion loss, and good polarization extinction ratio. Measurement
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Buildup and synchronization regimes of a vector pure-quartic soliton molecule in a fiber laser cavity Opt. Express (IF 3.8) Pub Date : 2024-03-15 Chaojian He, Zhiwei Zhu, Song Yang, Nan Wang, Yingying Yang, and Xuechun Lin
Pure-quartic solitons (PQSs) have recently received increasing attention due to their energy-width scaling over the traditional soliton, which has expanded our understanding of soliton dynamics with high-order dispersion in nonlinear systems. Here, we numerically reveal the asynchronization and synchronization processes of the sub-pulse within the vector PQS molecule in a mode-locked fiber laser by
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Staring X-ray backscatter imaging based on ultra-high aspect ratio lobster eye lens Opt. Express (IF 3.8) Pub Date : 2024-03-14 Yuxiang Yang, Mingzhao Ouyang, Longhui Li, Yingjun Zhang, Shizhang Ma, and Yuegang Fu
In contrast to conventional X-ray imaging systems, the lobster eye lens, serving as a pivotal component for X-ray focusing, presents the potential for downsizing X-ray backscatter imaging systems. This study reports the successful implementation of a pioneering non-contact staring X-ray backscatter imaging experiment, with the target positioned 1.5 meters away from the system and employing a tube voltage
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Pulsed Ho:YLF laser intra-cavity pumped by a diode-pumped Q-switched Tm:YAP laser Opt. Express (IF 3.8) Pub Date : 2024-03-13 Jingjing Liu, Qianqian Peng, Cheng Zhang, Jiahao Dong, and Jie Liu
We reported an intra-cavity pumped Q-switched laser with dual-wavelength synchronous output at 2066.7 nm and 1940nm. Ho:YLF crystal was pumped by a self-Q-switched Tm:YAP laser, which was served as both a gain medium and a saturable absorber simultaneously. For Ho:YLF laser, under 11.4-W incident pump power, a stable pulse laser was achieved at 2066.7 nm with the highest peak power of 69.65 W and the
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Rapid calculation of the efficiency of self-terminating four-level Q-switched lasers Opt. Express (IF 3.8) Pub Date : 2024-03-15 Larry Merkle, Ei Ei Brown, Zackery Fleischman, Jason McKay, and Mark Dubinskii
We have developed a simple approach to deriving the efficiency of Q-switched four-level lasers, valid even for arbitrarily long lower laser level lifetimes. By eliminating time dependence from the calculation, numerical solutions can be obtained very rapidly. Its threshold and limiting slope efficiency values provide useful estimates for free-running pulsed four-level lasers as well as Q-switched.
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3D parallel pulsed chaos LiDAR system Opt. Express (IF 3.8) Pub Date : 2024-03-15 Wei Xiong, Qingsong Bai, Yuqi Hu, Xing Zhang, Yilu Wu, Guangqiong Xia, Heng Zhou, Jiagui Wu, and Zhengmao Wu
We propose and experimentally demonstrate a parallel pulsed chaos light detection and ranging (LiDAR) system with a high peak power, parallelism, and anti-interference. The system generates chaotic microcombs based on a chip-scale Si3N4 microresonator. After passing through an acousto-optic modulator, the continuous-wave chaotic microcomb can be transformed into a pulsed chaotic microcomb, in which
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Highly sensitive mid-infrared methane remote sensor using a deep neural network filter Opt. Express (IF 3.8) Pub Date : 2024-03-15 Senyuan Wang, Shicheng Yang, Shouzheng Zhu, Shijie Liu, Xin He, Guoliang Tang, Chunlai Li, and Jianyu Wang
A novel mid-infrared methane remote sensor integrated on a movable platform based on a 3.291-µm interband cascade laser (ICL) and wavelength modulation spectroscopy (WMS) is proposed. A transmitting-receiving coaxial, visualized optical layout is employed to minimize laser energy loss. Using a hollow retro-reflector remotely deployed as a cooperative target, the atmospheric average methane concentration
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Polarization smoothing based on full Poincaré beams modulated by stress-engineered optics Opt. Express (IF 3.8) Pub Date : 2024-03-13 Bowu Liu, Xibo Sun, Hui Wang, Qiang Yuan, Menjiya Tian, Dongya Chu, and Yuanchao Geng
In laser-driven inertial confinement fusion (ICF) facilities, nonuniform laser irradiation can cause significant challenges, such as hydrodynamics instability and laser plasma instability, which hinder the success of fusion. This article presents a new idea for improving the uniformity of far-field laser irradiation through a method of single-beam polarization smoothing. The method involves modulating
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Temporally optimized and spectrally shaped hyperspectral coherent anti-Stokes Raman scattering microscopy Opt. Express (IF 3.8) Pub Date : 2024-03-13 Lingxiao Yang, Rishyashring R. Iyer, Janet E. Sorrells, Carlos A. Renteria, and Stephen A. Boppart
Coherent anti-Stokes Raman scattering (CARS) microscopy offers label-free chemical contrasts based on molecular vibrations. Hyperspectral CARS (HS-CARS) microscopy enables comprehensive microscale chemical characterization of biological samples. Various HS-CARS methods have been developed with individual advantages and disadvantages. We present what we believe to be a new temporally optimized and spectrally
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Overlap correction function based on multi-angle measurements for an airborne direct-detection lidar for atmospheric sensing Opt. Express (IF 3.8) Pub Date : 2024-03-12 Mariana Adam and Franco Marenco
We estimate the overlap function (accounting for near-field effects) for an airborne nadir-mounted lidar, based on multi-angle measurements of an atmospheric scene obtained during two flights. For each atmospheric layer, a regression on the logarithm of the range-corrected signal versus the secant of the off-nadir angle allowed evaluation of the optical depth and the backscattering coefficient multiplied
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MI-MZI based distributed optical fiber sensor for location and pattern recognition Opt. Express (IF 3.8) Pub Date : 2024-03-12 Shu Zhang, Yixiao Ma, Xin Lai, Qian Xiao, Bo Jia, and Hongyan Wu
This research addressed the drawbacks of the conventional hybrid structure and processing technique by presenting a novel distributed fiber optic sensor based on a hybrid Michelson and Mach-Zehnder interferometer. The sensor can achieve blind spot free positioning and has a wide response frequency, additionally its structure is not complex. It can obtain two phase signals from each of the two interferometers
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Dynamic three-dimensional deformation measurement by polarization-multiplexing of full complex amplitude Opt. Express (IF 3.8) Pub Date : 2024-03-15 Yijun Du, Junxiang Li, Chen Fan, Xingyu Yang, Zixin Zhao, and Hong Zhao
This paper provides an extensive discussion of a complex amplitude-based dynamic three-dimensional deformation measurement method, in which the phase and amplitude of the speckle field are used for out-of-plane and in-plane deformation calculation respectively. By determining the optimal polarization states of the speckle field and reference field from the comprehensive analysis of measurement mathematical
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Coherent detection of the rotational Doppler effect measurement based on triple Fourier transform Opt. Express (IF 3.8) Pub Date : 2024-03-15 Hongyu Yan, Yaohui Fan, Ziyan Huang, Ruoyu Tang, Shuyu Ma, Yu Lei, You Ding, Xiangyang Zhu, Tong Liu, Zhengliang Liu, and Yuan Ren
In recent years, the rotational Doppler effect (RDE) has been widely used in rotational motion measurement. However, the performance of existing detection systems based on the RDE are generally limited by the drastic reduction of signal-to-noise ratio (SNR) due to the influence of atmospheric turbulence, partial obscuration of the vortex beam (VB) during propagation, and misalignment between the optical
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Monolithic beam combined quantum cascade laser arrays with integrated arrayed waveguide gratings Opt. Express (IF 3.8) Pub Date : 2024-03-14 Tushar Sanjay Karnik, Laurent Diehl, Khoi Phuong Dao, Qingyang Du, Christian Pflügl, Daryoosh Vakhshoori, and Juejun Hu
Quantum cascade lasers (QCLs) are ubiquitous mid-infrared sources owing to their flexible designs and compact footprints. Manufacturing multiwavelength QCL chips with high power levels and good beam quality is highly desirable for many applications. In this study, we demonstrate an λ ∼ 4.9 µm monolithic, wavelength beam-combined (WBC) infrared laser source by integrating on a single chip array of five
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Surface damage induced by micropores in transparent ceramics under nanosecond laser irradiation Opt. Express (IF 3.8) Pub Date : 2024-03-14 Yue Chen, Tao Feng, Yuan-an Zhao, Ben-xue Jiang, and Long Zhang
The increasing use of transparent ceramics in laser systems presents a challenge; their low damage threshold has become a significant impediment to the development of powerful laser systems. Consequently, it is imperative to undertake research into the damage sustained by these materials. Micropores, the most common structural defects in transparent ceramics, inevitably remain within the material during
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Effects of laser pulse duration on the formation dynamics of laser-induced periodic nanostructures Opt. Express (IF 3.8) Pub Date : 2024-03-15 Reina Miyagawa, Tetsuyuki Ohgai, Shusuke Yoshikawa, Hwan Hong Lim, SeyedAli Rezvani, Takunori Taira, and Osamu Eryu
Formation dynamics of laser-induced periodic surface structures (LIPSSs) on the SiC substrates were described with varying pulse numbers and pulse duration. As the number of laser pulses increases, two significant transformations become evident in the progression of structural formations. First from surface roughening with nanoparticles to LIPSS with the period that is slightly shorter than the laser
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28.02 W LD side-pumped CW laser operated at 2.8 µm in YSGG/Er:YSGG/YSGG crystal Opt. Express (IF 3.8) Pub Date : 2024-03-14 Huili Zhang, Dunlu Sun, Jianqiao Luo, Cong Quan, Peixiong Zhang, Yang Qiao, Kunpeng Dong, Yuwei Chen, Zhentao Wang, Hongyuan Li, and Maojie Cheng
We demonstrated a 978 nm laser diode (LD) side-pumped YSGG/Er:YSGG/YSGG composite crystal with a size of Ф 3 mm × 65 mm and continuous-wave (CW) mode. By optimizing resonator length and output mirror transmittance, a maximum output power of 28.02 W is generated, corresponding to slope efficiency of 17.55% and optical-optical efficiency of 12.29%, respectively. The thermal focal lengths are obtained
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Demonstration of stable, long-term operation of a nanosecond pulsed DPSSL at 10 J, 100 Hz Opt. Express (IF 3.8) Pub Date : 2024-03-15 Mariastefania De Vido, Gary Quinn, Danielle Clarke, Luke McHugh, Paul Mason, Jacob Spear, Jodie M. Smith, Martin Divoky, Jan Pilar, Ondrej Denk, Thomas J. Butcher, Chris Edwards, Tomas Mocek, and John L. Collier
We report on stable, long-term operation of a diode-pumped solid-state laser (DPSSL) amplifying 15 ns pulses at 1029.5 nm wavelength to 10 J energy at 100 Hz pulse rate, corresponding to 1 kW average power, with 25.4% optical-to-optical efficiency. The laser was operated at this level for over 45 minutes (∼3 · 105 shots) in two separate runs with a rms energy stability of 1%. The laser was also operated
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Surface exciton polariton enhanced Goos-Hänchen and Imbert-Fedorov shifts and their applications in refractive index sensing Opt. Express (IF 3.8) Pub Date : 2024-03-12 Yi Xu, Lin Wu, and L. K. Ang
The spatial and angular Goos-Hänchen shifts (GHSs) and Imbert-Fedorov shifts (IFSs) are theoretically investigated in a modified Kretschmann-Raether configuration consisting of glass prism, J-aggregate cyanine dye, and air. With the excitation of surface excitation polaritons (SEPs), the spatial and angular GHSs and IFSs for the transverse magnetic polarized light are strongly enhanced around the resonant
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Nonlinear asymmetric imaging with AlGaAs metasurface Opt. Express (IF 3.8) Pub Date : 2024-03-14 Davide Rocco, Andrea Locatelli, Luca Carletti, Maria Antonietta Vincenti, and Costantino De Angelis
Nowadays, dielectric metasurfaces are a promising platform in many different research fields such as sensing, lasing, all-optical modulation and nonlinear optics. Among all the different kinds of such thin structures, asymmetric geometries are recently attracting increasing interest. In particular, nonlinear light-matter interaction in metasurfaces constitutes a valid approach for achieving miniaturized
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OSNR enhancement of Rayleigh-assisted Brillouin-Raman fiber laser via double pass configuration Opt. Express (IF 3.8) Pub Date : 2024-03-15 G. Mamdoohi and M. R. K. Soltanian
We propose and demonstrate a 10 GHz spacing multi-wavelength Brillouin-Raman fiber laser (MBRFL) with wide bandwidth and an outstanding optical signal-to-noise ratio (OSNR). This is achieved by utilizing loop mirror at one end of the laser cavity through a symmetrical bi-directional Raman pumping scheme. The setup is arranged in a double pass configuration by employing different lengths of dispersion
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Time-varying propagation model and dynamic-feedback-phase correction for multiplexed orbital angular momentum beams in atmospheric turbulence Opt. Express (IF 3.8) Pub Date : 2024-03-12 Jin Hou, Siqi Zhang, Zhipeng Xia, Jingyu Wang, Dingshan Gao, D. S. Citrin, Wengui Rao, Zhenzhou Cao, Chunyong Yang, and Shaoping Chen
Freespace optical (FSO) communication in an outdoor setting is complicated by atmospheric turbulence (AT). A time-varying (TV) multiplexed orbital angular momentum (OAM) propagation model to consider AT under transverse-wind conditions is formulated for the first time, and optimized dynamic correction periods for various TV AT situations are found to improve the transmission efficiency. The TV nature
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Turbulence-resistant free space optical communication via chaotic block-matching and 3D filtering Opt. Express (IF 3.8) Pub Date : 2024-03-13 Tingwei Wu, Hanxiang Mou, Yutong He, Yejun Liu, Song Song, Lun Zhao, and Lei Guo
In this paper, we propose a chaotic block-matching and three-dimensional (C-BM3D) filtering algorithm to remove the noise and enhance the security in the turbulent channel of free space optical (FSO) communication. We experimentally demonstrate the performance of C-BM3D by comparing it with chaotic non-local means filtering (C-NLM), chaotic Gaussian filtering and chaotic Median filtering based on Log-normal
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Conditional convolutional GAN-based adaptive demodulator for OAM-SK-FSO communication Opt. Express (IF 3.8) Pub Date : 2024-03-14 Zheng Han, Xiao Chen, Yiquan Wang, and Yuanyuan Cai
The perturbation of atmosphere turbulence is a significant challenge in orbital angular momentum shift keying-based free space optical communication (OAM-SK-FSO). In this study, we propose an adaptive optical demodulation system based on deep learning techniques. A conditional convolutional GAN (ccGAN) network is applied to recover the distorted intensity pattern and assign it to its specified class
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Design method for eliminating spectral line tilt in a multiple sub-pupil ultra-spectral imager (MSPUI) Opt. Express (IF 3.8) Pub Date : 2024-03-14 Xv Zhang, Xin Fang, Tao Li, Xiao Xv Wang, Guo Chao Gu, Han Shuang Li, Guan Yu Lin, and Bo Li
A multiple sub-pupil ultra-spectral imaging system designed with a single spectrometer and detector can simultaneously detect multiple-channel spectra with ultra-high spectral resolution. However, due to using a prism in the system's front end, the nonlinear dispersion introduces spectral line tilt in the imaging spectra. This phenomenon can lead to bias in the final spectral data. To eliminate this
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Global optimization of multilayer dielectric coatings for precision measurements Opt. Express (IF 3.8) Pub Date : 2024-03-15 Gautam Venugopalan, Francisco Salces-Cárcoba, Koji Arai, and Rana X. Adhikari
We describe the design of optimized multilayer dielectric coatings for precision laser interferometry. By setting up an appropriate cost function and then using a global optimizer to find a minimum in the parameter space, we were able to realize coating designs that meet the design requirements for spectral reflectivity, thermal noise, absorption, and tolerances to coating fabrication errors. We also
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Distributed optical fiber magnetic field sensor based on polarization-sensitive OFDR Opt. Express (IF 3.8) Pub Date : 2024-03-15 Yi Tang, Mengshi Zhu, Fufei Pang, Heming Wei, Liang Zhang, Wei Chen, and Tingyun Wang
A distributed optical fiber magnetic field sensor based on a polarization-sensitive optical frequency domain reflectometer (POFDR) is proposed. It extracts the accumulated Faraday rotation by combining the Stokes vectors and the backward Mueller matrices from the measured states of polarization (SOPs) and obtains the magnetic field component. This method avoids adjusting the input polarization during
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Time-varying optical spin-orbit Hall effect in tightly focused femtosecond optical field Opt. Express (IF 3.8) Pub Date : 2024-03-14 Mingchao Zhu, Shenggui Fu, and Zhongsheng Man
The spin-orbit Hall effect (HE) is dominated by the law of conservation of angular momentum of a beam and is highly significant in light–matter interactions. The electromagnetic field, phase, topological structure, and spin-orbit HE of an azimuthally polarized vortex pulse beam in a tightly focused system are studied theoretically here. Calculations show that the focal field has ultrafast bright-dark
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Super amplification enabled by orbital angular momentum in weak measurement Opt. Express (IF 3.8) Pub Date : 2024-03-15 Shiwei Xie, Junfan Zhu, An Wang, Yue Wang, Yongping Huang, and Zhiyou Zhang
Weak measurement, which can amplify a weak signal, has shown great significance in precision measurements. The amplification is usually realized through the weak value and the propagation factor. We show that the orbital angular momentum (OAM) can provide another dimension for amplification that is linearly proportional to the OAM number. We employ OAM to measure the spin Hall effect of light and demonstrate
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Demonstration of a low loss, highly stable and re-useable edge coupler for high heralding efficiency and low g(2)(0) SOI correlated photon pair sources Opt. Express (IF 3.8) Pub Date : 2024-03-13 Jinyi Du, George F. R. Chen, Hongwei Gao, James A. Grieve, Dawn T. H. Tan, and Alexander Ling
We report a stable, low loss method for coupling light from silicon-on-insulator (SOI) photonic chips into optical fibers. The technique is realized using an on-chip tapered waveguide and a cleaved small core optical fiber. The on-chip taper is monolithic and does not require a patterned cladding, thus simplifying the chip fabrication process. The optical fiber segment is composed of a centimeter-long
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Quantum nonlinear effect in a dissipatively coupled optomechanical system Opt. Express (IF 3.8) Pub Date : 2024-03-15 Wen-Quan Yang, Wei Niu, Yong-Hong Ma, and Wen-Zhao Zhang
A full-quantum approach is used to study the quantum nonlinear properties of a compound Michelson-Sagnac interferometer optomechanical system. By deriving the effective Hamiltonian, we find that the reduced system exhibits a Kerr nonlinear term with a complex coefficient, entirely induced by the dissipative and dispersive couplings. Unexpectedly, the nonlinearities resulting from the dissipative coupling
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Analysis of the impact of temperature on the spectral shift in ultraviolet hyperspectral imaging spectrometers Opt. Express (IF 3.8) Pub Date : 2024-03-15 Guotao Pan, Bo Li, Guochao Gu, Xiangyang Yu, Hanshuang Li, Xiaoxu Wang, Zhanfeng Li, Xiaohu Yang, Junqing Zhu, Diansheng Cao, Bingqiang Li, Qingjun Ma, Heng Wu, Limin He, and Guanyu Lin
The imaging spectrometer's high performance in practical applications may be compromised by environmental factors, particularly temperature variations, posing a challenge to its stability. Temperature fluctuations can induce spectral shift, directly impacting the accuracy of spectral measurements, subsequently influencing the precision of radiometric measurements. To address this issue, this study
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Terahertz spectroscopy of thick and diluted water solutions Opt. Express (IF 3.8) Pub Date : 2024-03-12 Fabio Novelli
While bright terahertz sources are used to perform nonlinear experiments, they can be advantageous for high-precision linear measurements of opaque samples. By placing the sample away from the focus, nonlinearities can be suppressed, and sizeable amounts of transmitted radiation detected. Here, this approach is demonstrated for a 0.5 mm thick layer of liquid water in a static sample holder. Variations
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Tunable terahertz absorption of ion gel-graphene hybrids based on the Salisbury effect Opt. Express (IF 3.8) Pub Date : 2024-03-15 Qiannan Li, Linyu Mei, Kaixi Bi, Liuyu Hou, Shuai Zhang, Shuqi Han, Miaoli Guo, Shengguo Zhang, Dianyu Wu, Jiliang Mu, and Xiujian Chou
The gate-tunable absorption properties of graphene make it suitable for terahertz (THz) absorbers. However, the realization of a graphene-based THz absorber faces challenges between the difficulty of patterning graphene for processing and the intrinsically low absorbance of graphene with the high electric field needed to change the conductivity of graphene. This report presents an electrically tunable
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Method of generating speckle patterns for digital image correlation based on modified Conway’s Game of Life Opt. Express (IF 3.8) Pub Date : 2024-03-14 Yuxin Wen, Jianli Wang, Le Zheng, Song Chen, Haoming An, Long Li, and Yu Long
The measurement accuracy of digital image correlation (DIC) is influenced by the quality of the speckle pattern. Although various models for generating random speckle patterns have been well discussed, obtaining appropriate speckle images with isotropic quality and performance could be a challenging issue in DIC. In this paper, we propose a novel (to our knowledge) method for generating speckle patterns
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Broadband mirrors for thermophotovoltaics Opt. Express (IF 3.8) Pub Date : 2024-03-12 Zunaid Omair, Sean Hooten, Varun Menon, Patrick Oduor, Kwong-Kit Choi, and Achyut K. Dutta
We present an innovative solution to improve the efficiency of thermophotovoltaic (TPV) devices by tackling the problem of sub-bandgap photon losses. We propose an optimized design for thin-film mirrors using inverse electromagnetic design principles, thereby enhancing the average reflectivity and photon re-use. Our method surpasses the traditional Bragg mirror by employing a gradient-descent based
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Extended depth of field for Fresnel zone aperture camera via fast passive depth estimation Opt. Express (IF 3.8) Pub Date : 2024-03-12 Chen Yang, Cong Ni, Xinye Zhang, Yusen Li, Yusheng Zhai, Weiji He, Wenwen Zhang, and Qian Chen
The lensless camera with incoherent illumination has gained significant research interest for its thin and flexible structure. However, it faces challenges in resolving scenes with a wide depth of field (DoF) due to its depth-dependent point spread function (PSF). In this paper, we present a single-shot method for extending the DoF in Fresnel zone aperture (FZA) cameras at visible wavelengths through
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Modeling and optimizing through plenoptic function for the dual lenticular lens-based directional autostereoscopic display system Opt. Express (IF 3.8) Pub Date : 2024-03-11 Xueling Li, Shengzhi Qiang, Yuanqing Wang, and Xicai Li
We propose an autostereoscopic display system that ensures full resolution for multiple users by directional backlight and eye tracking technology. The steerable beam formed by directional backlight can be regarded as the result of sparsely sampling the light field in space. Therefore, we intuitively propose an optimization algorithm based on the characterization for the state of the steerable beams
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HoloSR: deep learning-based super-resolution for real-time high-resolution computer-generated holograms Opt. Express (IF 3.8) Pub Date : 2024-03-12 Siwoo Lee, Seung-Woo Nam, Juhyun Lee, Yoonchan Jeong, and Byoungho Lee
This study presents HoloSR, a novel deep learning-based super-resolution approach designed to produce high-resolution computer-generated holograms from low-resolution RGBD images, enabling the real-time production of realistic three-dimensional images. The HoloSR combines the enhanced deep super-resolution network with resize and convolution layers, facilitating the direct generation of high-resolution
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Vertically spliced tabletop light field cave display with extended depth content and separately optimized compound lens array Opt. Express (IF 3.8) Pub Date : 2024-03-12 Xunbo Yu, Haoxiang Dong, Xin Gao, Hanyu Li, Zhaohe Zhang, Bangshao Fu, Xiangyu Pei, Xudong Wen, Siming Zhao, Binbin Yan, and Xinzhu Sang
Tabletop three-dimensional light field display is a kind of compelling display technology that can simultaneously provide stereoscopic vision for multiple viewers surrounding the lateral side of the device. However, if the flat panel light field display device is simply placed horizontally and displayed directly above, the visual frustum will be tilted and the 3D content outside the display panel will
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See farther and more: a master-slave UAVs based synthetic optical aperture imaging system with wide and dynamic baseline Opt. Express (IF 3.8) Pub Date : 2024-03-12 Yijie Zhang, Pei An, Zhilong Li, Qiong Liu, and You Yang
An open challenge remained in designing an optical system to capture the aerial image with a wide field of view (FoV) and high resolution. The optical system of one camera from a single unmanned aerial vehicle (UAV) can hardly promise the FoV and resolution. The conventional swarm UAVs can form the camera array with a short or fixed baseline. They can capture the images with a wide FoV and high resolution
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Transformed pupil-function misalignment calibration strategy for Fourier ptychographic microscopy Opt. Express (IF 3.8) Pub Date : 2024-03-13 Hongnian Liu, Tingfa Xu, Yiwen Chen, Yuncheng Wang, and Jianan Li
Fourier ptychographic microscopy (FPM) is an enabling quantitative phase imaging technique with both high-resolution (HR) and wide field-of-view (FOV), which can surpass the diffraction limit of the objective lens by employing an LED array to provide angular-varying illumination. The precise illumination angles are critical to ensure exact reconstruction, while it’s difficult to separate actual positional
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Quantitative characterization of micro-scanning imaging aliasing and optical parameter optimization Opt. Express (IF 3.8) Pub Date : 2024-03-13 Chao Zhang, Fafa Ren, Xiaorui Wang, Yangyang Li, Zhenshun Zhao, and Yue Li
Imaging aliasing is a common problem in the imaging domain. The aliasing of micro-scanning imaging is difficult to characterize accurately, and the matching relationship between the optical system and micro-scanning sampling is unclear. In this paper, a micro-scanning aliasing analysis model is proposed based on the property of sampling squeeze, in which the transfer functions of the optical system
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Photonic time-delayed reservoir computing based on series-coupled microring resonators with high memory capacity Opt. Express (IF 3.8) Pub Date : 2024-03-12 Hongliang Ren, Yijia Li, Ming Li, Mingyi Gao, Jin Lu, Chang-Ling Zou, Chun-Hua Dong, Peiqiong Yu, Xiaoniu Yang, and Qi Xuan
On-chip microring resonators (MRRs) have been proposed to construct time-delayed reservoir computing (RC) systems, which offer promising configurations available for computation with high scalability, high-density computing, and easy fabrication. A single MRR, however, is inadequate to provide enough memory for the computation task with diverse memory requirements. Large memory requirements are satisfied
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Wavelength division multiplexing based on the coupling effect of helical edge states in two-dimensional dielectric photonic crystals Opt. Express (IF 3.8) Pub Date : 2024-03-12 Liu He, Zhihao Lan, Yuting Yang, Qun Ren, Jian Wei You, Wei E. I. Sha, Wu Liang, and Jianquan Yao
Photonic topological insulators with topologically protected edge states featuring one-way, robustness and backscattering-immunity possess extraordinary abilities to steer and manipulate light. In this work, we construct a topological heterostructure (TH) consisting of a domain of nontrivial pseudospin-type topological photonic crystals (PCs) sandwiched between two domains of trivial PCs based on two-dimensional
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Interband cascade lasers grown simultaneously on GaSb, GaAs and Si substrates Opt. Express (IF 3.8) Pub Date : 2024-03-12 Maeva Fagot, Daniel A. Díaz-Thomas, Audrey Gilbert, Gad Kombila, Michel Ramonda, Yves Rouillard, Alexei N. Baranov, Jean-Baptiste Rodriguez, Eric Tournié, and Laurent Cerutti
We report on Sb-based interband cascade lasers simultaneously grown on GaSb, GaAs and Si substrates. 8 µm x 2 mm devices exhibited similar threshold currents around 40 mA at 20°C and achieved continuous-wave (CW) operation up to 65°C on GaSb, GaAs and Si substrates despite a dislocation density of ∼ 4.108 cm-2 for both mismatched substrates. In the CW regime the output power of the devices emitting
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Low repetition rate 915 nm figure-9 ultrafast laser with all-fiber structure Opt. Express (IF 3.8) Pub Date : 2024-03-12 Xin Li, Sha Li, Xuan Li, Yafei Wang, Zhi Cheng, Yatan Xiong, Xinru Cao, Yan Feng, and Jiaqi Zhou
The advent of optical metrology applications has necessitated the development of compact, reliable, and cost-effective picosecond lasers operating around 900 nm, specifically catering to the requirements of precise ranging. In response to this demand, our work introduces an innovative solution—an all-fiber, all-polarization-maintaining (PM) figure-9 mode-locked laser operating at 915 nm. The proposed
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10 W super-wideband ultra-low-intensity-noise single-frequency fiber laser at 1 µm Opt. Express (IF 3.8) Pub Date : 2024-03-13 Yunxin Sun, Changhe Wang, Qilai Zhao, Changsheng Yang, Chun Zeng, Wei Lin, Zhouming Feng, Zhongmin Yang, and Shanhui Xu
A 10 W super-wideband ultra-low-intensity-noise single-frequency fiber laser (SFFL) at 1 µm is experimentally demonstrated, based on dual gain saturation effects from semiconductors and optical fibers, together with an analog-digital hybrid optoelectronic feedback loop. Three intensity-noise-inhibited units synergistically work, which actualizes a connection of effective bandwidth and enhancement of
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Demonstration of 651 nm InGaN-based red light-emitting diode with an external quantum efficiency over 6% by InGaN/AlN strain release interlayer Opt. Express (IF 3.8) Pub Date : 2024-03-12 Kun Xing, Junwei Hu, Zhengwei Pan, Zhihu Xia, Zhengxian Jin, Liancheng Wang, Xiaolong Jiang, Haifeng Wang, Hong Zeng, and Xiujuan Wang
This work reports a high-performance InGaN-based red-emitting LED with a strain-release interlayer (SRI) consisting of an InGaN stress-release layer (SRL) and an AlN dislocation confinement layer (DCL) in unintentionally doped GaN (u-GaN). The SRL introduces a tensile strain which could decrease the in-plane compressive stress of the u-GaN layer, while the DCL could reduce the dislocation density and
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Compatible camouflage for dual-band guided-laser radar and infrared via a metamaterial perfect absorber Opt. Express (IF 3.8) Pub Date : 2024-03-12 Mingyu Luo, Tong Xie, Xin Li, Lin Zheng, Te Du, Zhenrong Zhang, and Junbo Yang
Laser-guided detector and infrared detection have attracted increasing attention in a wide range of research fields, including multispectral detection, radiative cooling, and thermal management. Previously reported absorbers presented shortcomings of lacking either tunability or compatibility. In this study, a metamaterial perfect absorber based on a Helmholtz resonator and fractal structure is proposed
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Multi-band reprogrammable phase-change metasurface spectral filters for on-chip spectrometers Opt. Express (IF 3.8) Pub Date : 2024-03-13 Qilin Zheng, Li Liang, Yunan Quan, Xianghong Nan, Dongqin Sun, Yongsheng Tan, Xin Hu, Qing Yu, and Zebo Fang
Active optical metasurfaces provide a platform for dynamic and real-time manipulation of light at subwavelength scales. However, most active metasurfaces are unable to simultaneously possess a wide wavelength tuning range and narrow resonance peaks, thereby limiting further advancements in the field of high-precision sensing or detection. In the paper, we proposed a reprogrammable active metasurface
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Versatile polarization-converted non-diffractive Bessel beams based on fully phase-modulated metasurfaces Opt. Express (IF 3.8) Pub Date : 2024-03-13 Jiahao Zhi, Zhifang Qiu, Xiaogang Wang, Kaikai Huang, and Bijun Xu
The Bessel beam has become significant in optical research due to its properties such as a long focal depth, self-healing, and non-diffraction. However, conventional methods for generating Bessel beams have drawbacks such as limited flexibility and tunability and the use of bulky optics. These factors lead to the complexity of the optical systems. This paper presents what we believe is a novel approach
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Degenerate spontaneous parametric down-conversion in nonlinear metasurfaces Opt. Express (IF 3.8) Pub Date : 2024-03-12 Tetsuyuki Ochiai
We propose a simple scheme of degenerate spontaneous parametric down-conversion (SPDC) in nonlinear metasurfaces or photonic crystal slabs with quasi-guided modes. It employs a band crossing between even- and odd-parity quasi-guided mode bands inside the light cone (above the light line) and a selection rule in the conversion efficiency of the SPDC. The efficiency can be evaluated fully classically
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Energetic picosecond 10.2-μm pulses generated in a BGGSe crystal for nonlinear seeding of terawatt-class CO2 amplifiers Opt. Express (IF 3.8) Pub Date : 2024-03-12 Ya-Po Yang, Jheng-Yu Lee, and Jyhpyng Wang
We demonstrate what we believe to be a new approach to energetic picosecond 10.2-µm pulse generation based on nonlinear mixing of subnanosecond single-frequency 1338-nm pulses and broadband 1540-nm chirped pulses in a BGGSe crystal followed by a grating compressor for the purpose of seeding high-power CO2 amplifiers. The energy of the 10.2-µm pulses exceeding 60 µJ with 3.4%-rms fluctuation can be
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Consideration of non-phase-matched nonlinear effects in the design of quasi-phase-matching crystals for optical parametric oscillators Opt. Express (IF 3.8) Pub Date : 2024-03-13 Zihua Zheng, Ziwen Tang, Zhiyi Wei, and Jinghua Sun
Femtosecond optical parametric oscillators (OPOs) are widely used in ultrafast nonlinear frequency conversion and quantum information. However, conventional OPOs based on quasi-phase-matching (QPM) crystals have many parasitic non-phase-matched processes which decrease the conversion efficiency. Here, we propose nine-wave coupled equations (NWCEs) to simulate all phase-matched and non-phase-matched
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SC and OFDM hybrid coherent optical transmission scheme based on 1-bit bandpass delta-sigma modulation Opt. Express (IF 3.8) Pub Date : 2024-03-12 Tangyao Xie, Xiangjun Xin, Liye Fang, Hengxin Yan, Xiaolong Pan, and Xinying Li
High-order quadrature amplitude modulation (QAM) can effectively improve the capacity and spectral efficiency of coherent optical transmission systems. However, as the modulation order increases, the signal becomes less tolerant to noise and nonlinear effects during transmission, and the implementation cost also increases. We propose a single carrier (SC) and orthogonal frequency division multiplexing
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Tool mark prediction on the surface of large-aperture mirrors via magnetorheological finishing Opt. Express (IF 3.8) Pub Date : 2024-03-12 Ximing Liu, Longxiang Li, Xingchang Li, Feng Zhang, and Xuejun Zhang
The magnetorheological finishing (MRF) of surfaces often results in tool mark errors. A prediction model can effectively guide subsequent processing, necessitating thorough research. To address this issue, this paper introduces an enhanced continuous tool influence function method. This method involves sub dwell time convolution with varying tool influence functions, enabling tool mark prediction.
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Evolution mechanism of scratch removal based on the implementation of magnetorheological finishing Opt. Express (IF 3.8) Pub Date : 2024-03-12 Yongjie Li, Longxiang Li, Xingchang Li, Runmu Cheng, Hongda Wei, Ximing Liu, Yiren Wang, and Xuejun Zhang
Scratches on optical components induce laser damage and limit the increase in laser power. Magnetorheological finishing (MRF) is a highly deterministic optical manufacturing technology that can improve the surface roughness of optical components. Although MRF has exhibited significant potential for reducing subsurface damage and removing scratches, the principle and mechanism behind the scratch removal