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Special Section Guest Editorial: Laser Damage V Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Vitaly E. Gruzdev; Jonathan W. Arenberg
The guest editors summarizes the contributions to Special Section on Laser Damage V.
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Long-term monitoring the damage performance of multilayer dielectric grating samples residing inside the compressor chamber of the OMEGA EP laser Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Alexei A. Kozlov; Stavros G. Demos; David Canning; Brittany N. Hoffman; Brian E. Kruschwitz; Amy L. Rigatti; Nickolaos Savidis; Leon J. Waxer
Understanding of the laser-induced damage threshold and impact of air–vacuum cycling of the optical components in short-pulse laser systems is of fundamental importance. We report the results of a damage-testing campaign that monitored representative pulse compression grating samples that were positioned inside the OMEGA EP grating compressor vacuum chamber during normal operation and routinely damage
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Theoretical and experimental analysis of co-designed binary phase masks for enhancing the depth of field of panchromatic cameras Opt. Eng. (IF 1.113) Pub Date : 2021-03-01 Alice Fontbonne; Hervé Sauer; François Goudail
We investigate the depth of field (DoF) enhancing capacity of binary annular phase masks embedded in panchromatic imaging systems. We first demonstrate with numerical simulations and real-world imaging experiments that phase masks optimized for monochromatic illumination are somewhat robust to their use under wide spectrum illumination: they provide images that are slightly less sharp but less affected
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Quantitative feature extraction of turbulent premixed flames by photofragmentation laser-induced fluorescence Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Minggang Wan; Mingbo Sun; Ge Wu; Qiang Gao; Bo Li; Hongbo Wang; Yongchao Sun; Jiajian Zhu
Planar laser-induced fluorescence (PLIF) techniques have been widely used for flame structure visualization in recent years. Nevertheless, most of the studies were concerned with qualitative analysis of the obtained images and the quantitative analysis were much fewer. This work presents a quantitative feature extraction method to process the ribbon structures that are captured in images and represent
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Computer vision with deep learning for ship draft reading Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Bangping Wang; Zhiming Liu; Haoran Wang
The draft is a measurement of the vertical distance between the waterline and the bottom of the ship hull. The displacement tonnage of a ship then can be calculated by the observed draft. The current draft survey is done by surveyors, which is subject to human errors. We propose to use computer vision with deep learning for draft reading from images. First, mask R-CNN is used to segment the region
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Developing a chip-scale optical clock Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Weimin Zhou; James Cahill; Jimmy H. Ni; Andrew Deloach; Sang-Yeon Cho; Stephen Anderson; Tanvir Mahmood; Patrick Sykes; Wendy L. Sarney; Asher C. Leff
We report our in-house R&D efforts of designing and developing key integrated photonic devices and technologies for a chip-scale optical oscillator and/or clock. This would provide precision sources to RF-photonic systems. It could also be the basic building block for a photonic technology to provide positioning, navigation, and timing as well as 5G networks. Recently, optical frequency comb (OFC)-based
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Design and optimization of top-Gaussian illumination field in photolithography Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Xiaozhe Ma; Fang Zhang; Zhiyuan Niu; Huijie Huang
Top-Gaussian illumination generation technology has considerable application prospects in photolithography. We propose a detailed design and optimization method for the optical component that generates the top-Gaussian illumination field. This method can generate a field with a specific profile in the scan direction and a rectangular distribution in the nonscan direction. The energy density is reduced
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Real-time computer-generated integral image based on GPU-driven cross perspective rendering pipeline Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Yanxin Guan; Xinzhu Sang; Shujun Xing; Yuanhang Li; Yingying Chen; Peng Wang; Duo Chen; Binbin Yan
It is insufficiently powerful to compute multi-view images at a high enough frame or data rate to support high quality dynamic three-dimensional displays with the current computer software and hardware. According to the correspondence between lens position and elemental image, a real-time computer-generated content generation method for integral imaging based on cross perspective is presented. A GPU-driven
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Active hyperspectral mid-infrared imaging based on a widely tunable quantum cascade laser for early detection of plant water stress Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Chaimae El Fakir; Maroun Hjeij; Ronan Le Page; Luiz Poffo; Bastien Billiot; Pascal Besnard; Jean-Marc Goujon
Plant water stress has been extensively studied using hyperspectral visible- and near-infrared systems. Thermal imaging and the recent availability of widely tunable infrared quantum cascade laser (QCL) allow us to propose an active hyperspectral imaging system operating in the mid-infrared (MIR) band, where the system output consists of a series of narrowband subimages arranged across the reflectance
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Reliable part-based long-term tracking using multiple correlation filters Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Hongyu Chen; Haibo Luo; Bin Hui; Zheng Chang
Most visual trackers focus on short-term tracking. The target is always in the camera field of view or slight occlusion (OCC). Compared with short-term tracking, long-term tracking is a more challenging task. It requires the ability to capture the target in long-term sequences and undergo frequent disappearances and reappearances of target. Therefore, long-term tracking is much closer to a realistic
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Etendue maintained white solid-state light generation by light emitting diodes pumped green aluminate green-yellow phosphor Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Chris Price; Kang Li; Yuanlong Fan; Peter Rees; Nigel Copner
We propose a technique to generate etendue maintained white light. The proposed technique uses three high-power blue light emitting diodes (LEDs) with identical characteristics to pump green aluminate (GAL) green-yellow phosphor coated on the inner channel of a waveguide. The technique offers two methods of generation of white light. Standalone partial conversion of blue to green and yellow light by
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Structured light for ultrafast laser micro- and nanoprocessing Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Daniel Flamm; Daniel G. Grossmann; Marc Sailer; Myriam Kaiser; Felix Zimmermann; Keyou Chen; Michael Jenne; Jonas Kleiner; Julian Hellstern; Christoph Tillkorn; Dirk H. Sutter; Malte Kumkar
The industrial maturity of ultrashort pulsed lasers has triggered the development of a plethora of material processing strategies. Recently, the combination of these remarkable temporal pulse properties with advanced structured light concepts has led to breakthroughs in the development of laser application methods, which will now gradually reach industrial environments. We review the efficient generation
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Generation and anti-dispersion transmission of quadrupling-bandwidth dual-chirp microwave waveform based on a polarization-division multiplexing Mach–Zehnder modulator Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Xiaojie Fan; Sha Zhu; Ye Xiao; Ming Li; Ning Hua Zhu; Wei Li
We propose and demonstrate a photonic approach to generate and transmit a quadrupling-bandwidth dual-chirp microwave waveform with anti-dispersion transmission. Commonly, dual-chirp microwave waveforms are generated by double-sideband modulation, which brings severe chromatic-dispersion-induced power fading (CDIP) over fiber transmission. In this scheme, we perform optical carrier suppression via a
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Simple target acquisition model based on Fλ/d Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Ronald Driggers; Glenn Goranson; Steve Butrimas; Gerald Holst; Orges Furxhi
The US Army Night Vision and Electronic Sensors Directorate’s Night Vision Integrated Performance Model (NVIPM) is a robust, comprehensive, and sophisticated model that calculates the performance of an infrared imager in the task of target acquisition. The inputs are specifics about the target, atmosphere, optics, detector, electronics, and display and the outputs are probabilities of target detection
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Design and performance analysis of a triple-band metamaterial absorber with ultrathin and polarization-insensitive property Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Han Wu; Shijun Ji; Ji Zhao; Chengxin Jiang; Zhiyou Luo
A triple-band metamaterial absorber (MMA), which is ultrathin and polarization-insensitive, is designed and fabricated. The top layer of the MMAs consists of a square-shaped copper film with a cross cut out in the center. The calculation result demonstrates that there are three distinct absorption peaks, which are 5.86, 15.04, and 17.5 GHz, and their corresponding absorption rates are 99.76%, 99.11%
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Windowed region-of-interest non-uniformity correction and range walk error correction of a 3D flash LiDAR camera Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Andrew Reinhardt; Cullen Bradley; Anna Hecht; Paul McManamon
We present experimental methods and results for photo-response non-uniformity correction (PRNUC) in range for a 3D flash LiDAR camera from non-optimal static-scene calibration data. Range walk is also corrected. This method breaks up the camera’s focal plane array (FPA) into 16 × 16 windowed regions of interest that are incrementally captured and stitched together in post-processing across the entire
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Ultrafast carrier reservoir semiconductor optical amplifiers-based all-optical AND logic gate Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Amer Kotb
It has become an imperative reality to find an alternative for the conventional bulk semiconductor optical amplifier (SOA), which suffers from the slow dynamic response, in light of the increased need for higher speeds. In this research, the carrier reservoir SOA (CR-SOA) is employed as a suitable alternative to investigate the all-optical AND logic gate for the first time at an operating speed of
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Low-cost laser detection system with a 360-deg horizontal field of view Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Marie Zandi; Kate Sugden; David M. Benton
A low-cost laser detection system based on coherence detection has been developed and is able to detect weak, continuous laser sources even against bright background light. The system is composed of a Mach–Zehnder interferometer with one arm modified with a piezo-mounted mirror to modulate the path length. We introduce methods to determine the laser wavelength and to extend the horizontal field of
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Phase measuring deflectometry for obtaining 3D shape of specular surface: a review of the state-of-the-art Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Zonghua Zhang; Caixia Chang; Xiaohong Liu; Ziyu Li; Yanqing Shi; Nan Gao; Zhaozong Meng
Phase measuring deflectometry (PMD) is a superior technique to obtain three-dimensional (3D) shape information of specular surfaces because of its advantages of large dynamic range, noncontact operation, full-field measurement, fast acquisition, high precision, and automatic data processing. We review the recent advances on PMD. The basic principle of PMD is introduced following several PMD methods
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Studies on gas concentration reconstruction methods for simultaneous temperature and H2O concentration tomographic imaging in a flame based on tunable diode laser absorption spectroscopy Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Yunchu Zhai; Fei Wang
Analysis of spatial temperature and gas concentration distributions is of great importance for combustion research. Algebraic reconstruction technique (ART) and adaptive algebraic reconstruction technique (AART) based on tunable diode laser absorption spectroscopy are both widely used methods for temperature tomographic imaging in a flame. After being obtained the temperature tomography through iterative
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Influence of phase-sensitive optical time-domain reflectometer on community antenna television transmission Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Ondrej Havlis; Josef Vojtech; Radek Velc; Martin Slapak; Miloslav Filka; Edvin Skaljo
Multiple studies have been carried out to analyze the mutual interaction of a phase-sensitive optical time-domain reflectometer (Φ-OTDR) and parallel digital data traffic. However, interactions with analog transmission, e.g., community antenna television (CATV), have not been addressed. Our study examines and presents the influence of a developed sensing system Φ-OTDR when operated simultaneously on
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Optical properties and annealing effects of planar waveguides on fluoride lead silicate glass formed by proton and helium-ion implantation Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Jie Zhang; Jing-Yi Chen; Shuo-Qi Lin; Rui-Lin Zheng; Liao-Lin Zhang; Chun-Xiao Liu
The optical planar waveguides were fabricated by proton implantation with an energy of 400 keV and a dose of 8 × 1016 ions / cm2 or 400-keV helium-ion implantation with a fluence of 6 × 1016 ions / cm2 in the fluoride lead silicate glass. The morphologies were studied by a Zeiss microscope to estimate the thickness of the waveguides. The annealing effects on the fluoride lead silicate glass waveguides
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Three-dimensional pipeline Hough transform for small target detection Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Jingneng Fu; Honggang Wei; Hui Zhang; Xiaodong Gao
We propose a 3D Hough transform (3D-HT) algorithm that can overcome the disadvantages of high complexity and large data storage space of the existing 3D-HT-based small target detection algorithms. The proposed algorithm uses two coordinates at different times and coordinate errors to construct a 3D pipeline. Subsequently, it counts the number of points in the 3D pipeline and confirms the presence of
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Characterization of LEDs for visible-light communications Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Rifat Kisacik; Arda Deniz Yalcinkaya; Ali Emre Pusane; Tuncer Baykas; Murat Uysal
Recent advances in solid-state technologies have enabled the development of light-emitting diodes (LEDs) with favorable features such as long life expectancy, low-power consumption, and reduced heat dissipation. Visible-light communication (VLC) is a short-range wireless access technology that deploys LEDs as wireless transmitters in addition to their primary task of illumination. The major limitation
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Noncoaxially propagating discrete data by coding/decoding orbital angular momentum of vortex beam through multiple channels Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Xiaohui Wang; Yingxiong Song; Xinnian Guo; Liyun Zhuang; Song Yang; Yongfeng Ju; Xiaofeng He; Yudong Yang
A concept of noncoaxially propagating discrete data by coding/decoding orbital angular momentum (OAM) of vortex beam through multiple channels is proposed. Four independent channels along different directions (diffraction orders/angles) are established by a series of specially designed holograms. Sixteen vortex beams are used to code each sequence with the length of 4 bits into an OAM mode in each
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Optical design and simulation of Einstein Probe satellite follow-up x-ray telescope Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Yuxuan Zhu; Jingbin Lu; Yangji Yang; Min Cong; Lizhi Sheng; Pengfei Qiang; Weiwei Cui; Ziliang Zhang; Yusa Wang; Dawei Han; Wei Li; Juan Wang; Jia Huo; Maoshun Li; Xiaofan Zhao; Nian Yu; Zeyu Song; Jia Ma; Zhonghua Lv; Zijian Zhao; Hao Wang; Dongjie Hou; Can Chen; Tianxiang Chen; Xiongtao Yang; Laidan Luo; Bing Lu; Jingjing Xu; Yehai Chen; Yong Chen
The Follow-up X-ray Telescope (FXT), a key payload onboard the Einstein Probe sallite (EP), is equipped with a Wolter-I x-ray focusing mirror system. We introduce the principle of such a mirror system and analyze the influence of the mirror gap in the multishell nested mirror of the FXT on the effective area, stray-light ratio, and vignetting. To ensure that no occlusion occurs within adjacent shells
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Experimental investigation on the intensity-balanced dual-frequency Nd: GdVO4 microchip laser Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Miao Hu; Mengmeng Xu; Yizhi Ke; Xuefang Zhou; Yang Lu; Meihua Bi; Qiliang Li
We present an intensity-balanced dual-frequency laser (DFL) based on an Nd: GdVO4 microchip crystal. The intensity balance ratio tuning mechanism of the DFL, which is governed by the heat sink temperature Tc of the laser crystal, is experimentally studied. The experimental results indicate that keeping a balanced intensity condition, when the pumping power of the DFL increases, the heat sink temperature
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Investigation of weather effects toward convergence of wired and wireless gigabit services over hybrid free-space optical link Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Abhishek Tripathi; Shilpi Gupta; Abhilash Mandloi
We investigate hybrid free-space optical (FSO) link in converged baseband and 60-GHz radio-frequency signals under adverse climate conditions. In this approach, optical double-sideband with carrier method is utilized. The adoption of such an FSO system can be contributed to existing fiber-optic architecture. Managing the signal strength by erbium-doped fiber amplifier, deployment of the system serves
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Enhanced radiation pressure reversal on free carriers in nanoparticles and polarization dependence in the Rayleigh regime Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Christopher Jones; Brandon A. Kemp; Cheyenne J. Sheppard
The phenomenon of reversed radiation pressure on free electrons in a nanoparticle requires the necessary but insufficient condition that the real part of the particle’s permittivity be negative. It is shown that Rayeigh scattering theory is adequate for modeling the phenomenon by favorable comparison with Mie theory for single particles. A multiparticle Rayleigh scattering approach demonstrates that
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Review of pulse compression gratings for chirped pulse amplification system Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Wenfei Zhang; Weijin Kong; Guomei Wang; Fei Xing; Fang Zhang; Huanian Zhang; Shenggui Fu
The ultrashort, ultrahigh intensity pulse laser has been fully developed in past three decades. Chirped pulse amplification (CPA) system plays an important role in the generation of the ultrashort, ultrahigh intensity pulse laser. Pulse compression gratings (PCGs) are the key element of CPA system and determine the performance and lifetime of the whole system. We introduce the principle of CPA system
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Algorithm of object localization applied on high-voltage power transmission lines based on line stereo matching Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Fashuai Tang; Qi Gao; Zongzhan Du
The algorithm designing of object localization is one of the key technologies in the research field of high-voltage power transmission line inspection robot. We present an obstacle localization method based on line stereo matching to solve the problems remaining in the current obstacle localization algorithms such as the weak capacity of resisting distraction, the low localization precision, and the
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Absolute phase correction for phase-measuring profilometry based on color-coded fringes Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Lei Cui; Guoying Feng; Hongru Li; Han Yuan; Zhongyi Bao
A phase correction method that utilizes fringe color-coding in phase-measuring profilometry is proposed. Original and additional fringes are encoded into the R and B channels, respectively. The R + B channel patterns are projected onto an object, captured using a camera, where the R and B channels are extracted. Then, phase shifts obtained from the R and B channels are utilized for absolute phase calculation
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Selectively excited bimodal interferometer for highly sensitive refractive index sensing Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Keito Ebihara; Kiyoshi Asakawa; Hiroaki Suzuki
A selectively excited bimodal interferometer was developed for highly sensitive detection of refractive index changes. Numerical simulation revealed that multimode waveguides with tall, narrow cross-sections are suitable for realizing a highly sensitive bimodal (fundamental and lateral first-order modes) interferometer, owing to deeper penetration of the lateral first-order mode through its side surfaces
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Laser polishing of additive manufactured Ti6Al4V alloy: a review Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Jiejing Li; Dunwen Zuo
Additive manufactured Ti6Al4V alloy has excellent comprehensive properties and has broad application prospects in the aerospace, biomedicine, and other fields. However, the fabricated components are too rough to use directly. So, a corresponding postprocess is needed urgently. The conventional finishing process cannot meet the requirements of green and efficient processing because of its time consumption
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Digital holographic particle position detection using two views and aperture reduction techniques Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Sassia Zaidi; Larbi Bouamama; Serge Simoëns
Digital holography is a well-established technique for tracer particle studies in a flow. Unfortunately, its great depth of focus increases the uncertainty along the Z axis. This drawback becomes very significant when the concentration of seeding particles increases. This is the case in real installations such as wind or water channel flows. In such cases, observing the whole volume, and therefore
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Broadband Glan-type polarization scheme based on mercury halide crystal Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Dmitriy L. Porokhovnichenko; Evgeniy A. Dyakonov; Jaeyeol Ryu; Vladimir I. Balakshy
A broadband air gap polarization prism design based on Hg2Cl2, Hg2Br2, and Hg2I2 crystals is suggested. Spectral ranges of operation extend from visible light up to 40 μm, and strong birefringence of the materials makes it possible to optimize the crystal cut geometry. Results include a large symmetric field of view up to 20 deg wide within the entire mid- and far-infrared transparency range, as well
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Wide-range tunable, dual-band, background refractive index insensitive terahertz absorber based on graphene and Dirac semimetal Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Shuaizhao Wang; Ronghui Xu; Zujun Qin; Houquan Liu; Shijie Deng; Ming Chen; Yu Cheng; Libo Yuan
In this study, we propose a dual-band wide-range tunable terahertz absorber based on graphene and bulk Dirac semimetal (BDS), which consists of a patterned BDS array, dielectric material, continuous graphene layer, and gold mirror. Simulation results show that the absorption at 3.97 and 7.94 THz achieve almost 100%. By changing the Fermi energy of graphene and BDS, the resonance frequency can be tuned
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Implantable wirelessly powered optoelectronic device for optogenetics Opt. Eng. (IF 1.113) Pub Date : 2021-02-01 Yin Sha; Chen Lin; Hongyun Xie; Xiaoyan Yi; Teng Zhan; Xiancheng Liu; Yang Xiang; Wanrong Zhang
In vivo optogenetics provide special and powerful capabilities in regulation of neurons, research of neural circuits and even in treatment of brain diseases. However, conventional hardware for such studies tethers the experimental animals to remote light sources, power sources, or other functional modules, which imposes considerable physical constrains on natural behaviors and limits the range of the
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Energy test of an efficient random laser emission collecting system Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Ignacio Iparraguirre; Jon Azkargorta; Joaquin Fernández; Sara García-Revilla; Rolindes Balda
The problem of light collection in random lasers (RLs) is addressed. As the radiation emitted by this system is Lambertian due to its spatial incoherence, a device based on an ellipsoidal revolution mirror is designed, developed, and tested in order to optimize the harvesting of the radiation emitted by the RL. The system provides a simple injection procedure of the emitted energy at the entrance of
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Camouflaged encryption mechanism based on sparse decomposition of principal component orthogonal basis and ghost imaging Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Zhang Leihong; Wang Yang; Ye Hualong; Xu Runchu; Kang Yi; Zhang Zhisheng; Zhang Dawei; Wang Kaimin
Ghost imaging (GI) is a technology of nonlocal optical imaging, which is widely used in the field of information encryption. However, there are some inherent shortcomings in the encryption process, such as imperfect security and low imaging precision. To solve these problems, we propose a camouflaged encryption mechanism based on sparse decomposition of principal component orthogonal basis and ghost
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Phase unwrapping based on accumulation of residual maps with local denoising Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Quanbing Zhang; Sufan Wang; Yufan Yuan; Aoya Li
Phase unwrapping aims to reconstruct the absolute phase from its values mod 2π, which is a key problem in many non-contact optical metrologies and is still a challenging issue in the presence of noise. We present a robust phase unwrapping method with two steps based on local denoising and the accumulation of residual map (ARM). In the first step, based on the local polynomial approximations and intersection
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Fiber-to-chip light coupling using a graded-index lensed fiber collimator Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Siegfried Bondarenko; Marcel Hülsemann; Andreas Mai; Patrick Steglich
Fiber-to-chip light coupling using a graded-index (GRIN) fiber collimator is investigated. Our experiments with grating couplers and strip waveguides fabricated in a photonic integrated circuit technology reveal that the peak coupling efficiency of a GRIN fiber collimator is 7.8 dB lower than that of a single-mode fiber. However, the 3-dB alignment tolerance is improved by a factor of about 5.7 giving
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Super-capacitive patches and their use in low-pass filters and artificial dielectrics Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Jonathan A. Thompson; Giampaolo Pisano; Carole Tucker
The use of capacitive metal meshes consisting of square patches is well established in the design of millimeter-wave optical devices such as filters, half-wave plates, and graded-index lenses. The main property of these meshes, the capacitance, is controlled by the size of the square patch in the mesh’s unit cell up to a limit imposed by the minimum feature size of the manufacturing process. We report
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Hyperspectral phase retrieval: spectral–spatial data processing with sparsity-based complex domain cube filter Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Vladimir Katkovnik; Igor Shevkunov; Karen Egiazarian
Hyperspectral (HS) imaging retrieves information from data obtained across broadband spectral channels. Information to retrieve is a 3D cube, where two coordinates are spatial and the third one is spectral. This cube is complex-valued with varying amplitude and phase. We consider shearography optical setup, in which two phase-shifted broadband copies of the object projections are interfering at a sensor
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Development of an optical-mechanical scanning platform for terahertz wave imaging system Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Xiang Shi; Jian Chen
An optical-mechanical scanning platform for terahertz imaging is designed and studied based on the single-channel 360-GHz radiometer. The fast scanning of 360-GHz Cassegrain antenna beam is realized through the rotation of a metal mirror with the inclination of 45-deg angle. An optical-mechanical scanning platform with fast 2D beam scanning is integrated into the 360-GHz terahertz wave imaging system
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Study on microvibration effect of an optical satellite based on the imaging absence method Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Lin Yang; Yan-Song Wang; Lei Wei; Zi-Qiang Hu
High-accuracy optical satellites may be severely impacted by microvibrations. We propose a simulation and measurement method without an image criterion to evaluate microvibrations that is characterized by low cost and early intervention in a satellite project schedule. First, the relation between image shift value and image quality is identified. Second, frequency response analysis and an optical amplification
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Design of a tunable 8-channel DWDM covers all transmission windows using defect mode nonlinear photonic crystals Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Sanjeev Sharma
The effect of a defective mode layer of GaAs semiconductor material of one-dimensional nonlinear photonic crystal, which is a function of intensity as well as the wavelength, is numerically simulated using transfer matrix method. It is observed that the transmission efficiency of this defective layer increases with an increase in the wavelength of the material. At the first transmission window (820
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Thermo-optical properties and measurements of electronic polarizability coefficients of annealed tungsten bronzes without and within an oxygen plasma environment Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Zahid Hussain
WO3 thin films evaporated on unheated substrates were found to be substoichiometric and microcrystalline in nature as found by the ellipsometric studies, density, and porosity measurements. In this investigation, we measured the optical constants of WO3 thin films and of MxWO3 (M = H + , Li + , and Na + ) bronzes (with different concentrations, x) after being annealed at different temperatures over
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Microstructured surface stitching based on wavelet transform three-dimensional data matching Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Lulu Li; Hui Zhang; Xiaojin Huang; Qian Liu
We proposed a subaperture stitching method for concave–convex microstructured surfaces. The method is mainly based on wavelet transform (WT) and three-dimensional (3D) data matching. WT is applied to separate the high-frequency information from the low-frequency information, then the speeded-up robust feature-random sample consensus algorithm is used to match 3D surface data and calculate lateral displacement
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Point diffraction interferometer with tilted waves for measuring complex surfaces Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Hua Shen; Yue Sun
Recently, much attention has been paid to optical components with complex surfaces because they can significantly optimize the aberrations of optical systems. However, a complex surface introduces several difficulties for precise measurement. To address this challenge, we propose tilted-wave point diffraction interferometer (TPDI) for measurements of complex surfaces. TPDI combines the advantages of
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Calibration and region extraction of polarization sensor for navigation Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Jinkui Chu; Wenhui Tian; Chuanlong Guan; Ze Liu; Yuanyi Fan
Polarization navigation is an autonomous navigation method that relies on stable polarization patterns in the sky. The polarization sensor for navigation is composed of a CMOS image sensor (CIS) and four-direction metal nanograting. The optical conversion deviation of the CIS and the transmittance deviation of metal nanograting are the main factors affecting the angle measurement accuracy of the polarization
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Analysis of gas bubble formation on light-absorbing microinclusion in liquid during laser irradiation: experimental and theoretical investigation Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Galina Shandybina; Alexandra Shamova; Andrey Belikov; Dmitry Polyakov
A simplified theoretical model that describes the formation of a gas bubble on a light-absorbing microinclusion in liquid during laser irradiation is presented. The experimental results of irradiation of agglomerates of carbon black nanoparticles with nanosecond laser pulses in distilled water and aqueous solution of glycerol are obtained. The satisfactory correspondence between the experimental and
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2020 List of Reviewers Opt. Eng. (IF 1.113) Pub Date : 2021-01-01
This is a list of reviewers who served Optical Engineering in 2020.
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Monopole antenna integrated cavity resonator for microwave imaging Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Fatih Özkan Alkurt; Muharrem Karaaslan; Murat Furat; Emin Ünal; Oğuzhan Akgöl
We present a system that displays an image of any metal structure in a scene by the use of microwave radiation from a cavity resonator in a 10-GHz frequency band. An 80 mm × 80 mm mushroom-like electromagnetic band gap (EBG) structure was arranged, designed, analyzed, and integrated with an X band monopole antenna and the designed EBG monopole antenna has ∼2-GHz bandwidth. Meanwhile, a cubic cavity
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Range-gated active short-wave infrared imaging for rain penetration Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Adam Willitsford; David Brown; Kevin Baldwin; Randall Hanna; Lindsey Marinello
A fixed wavelength optical parametric amplifier laser was constructed to create nanosecond pulsed light at 1527 nm for eye-safe range gated active short-wave infrared (SWIR) imaging. The laser pulse is generated using a Nd:YAG operating at 1064 nm to pump a potassium titanyle arsenate crystal in a single-pass geometry, resulting in ≈85 mJ at up to 28 Hz at 1527 nm with a pulse duration of ∼8 ns. The
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DepthFuseNet: an approach for fusion of thermal and visible images using a convolutional neural network Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Heena Patel; Kishor P. Upla
We address an approach called “DepthFuseNet” for the fusion of thermal and visible images using convolutional neural networks (CNN). The thermal image acquires radiating energy of the sensed objects and hence it can easily distinguish the objects from its background. However, the visible image (i.e., the image acquired within the range of visible wavelength of electromagnetic spectrum) provides a more
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Phase-space synthesized digital holography for high space-bandwidth product imaging Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Wenhui Zhang; Hao Zhang; Guofan Jin
High resolution and wide field of view (FOV) are always the goals of imaging, which are related to the space-bandwidth product (SBP) of the system. Currently, most methods focus on either resolution enhancement or FOV extension. Few works pay attention on both. There lacks a generalized framework for the joint space-frequency SBP expansion. We propose such a holographic imaging method, termed phase-space
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Cost-optimal architecture design for adaptive multi-stage TWDM-PON with PtP WDM overlay Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Md Shahbaz Akhtar; Aneek Adhya; Jitendra Gupta; Sudhan Majhi
Toward greenfield time and wavelength division multiplexed passive optical network (TWDM-PON) deployment in access segment, optimal network planning, and resource provisioning need to be explored in the planning phase to reduce capital expenditure (CapEx) and operational expenditure (OpEx). To address the issue, we propose an integer linear programming (ILP)-based optimization framework to design cost-efficient
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Simplified quantum secure direct communication system with decoy states based on linear optical devices Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Hossam Abdel Rahman; Khaled Kirah; Ayman M. Bahaa-Eldin; Mohamed Sobh
A simplified entanglement-based quantum secured direct communication system over optical fibers is proposed. Instead of the complicated optical and electronic devices used in the transmitter of standard systems for security checks, a decoy-state generator is integrated with the encoder. This provides a simple yet efficient and easy to implement solution to reveal the presence of intruders. A significant
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Performance analysis of grating-assisted passive mode-division multiplexing device using silicon photonics for high-speed RoF/RoFSO communication Opt. Eng. (IF 1.113) Pub Date : 2021-01-01 Dhiman Kakati; Manoranjan Minz; Ramesh Kumar Sonkar
The performance of a bidirectional silicon mode-division (de)multiplexer has been analyzed in the radio over fiber passive optical network system. The device uses two grating-assisted contra-directional coupler sections to demultiplex the transmitted fundamental, first-order, and second-order quasi-transverse electric (TE) modes. A bandwidth of 791 GHz and acceptable crosstalks of −25.73 dB (TE0m)
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