Optical Engineering + Applications最新文献_第8页

Zernike polynomials vs circular Bessel functions to represent aberrated wavefronts 泽尼克多项式与圆形贝塞尔函数表示像差波前

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2676551

Cristian M. Medina Coca, Brandon D. Sánchez Valencia, Emerson A. González Díaz, José L. Magaña-Chávez, Joel Cervantes Lozano, S. Balderas-Mata

引用次数: 0

Melting and crystallization peculiarities of Cd0.50Mn0.50Te solid solutions Cd0.50Mn0.50Te固溶体的熔融结晶特性

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2676357

O. Kopach, V. Kopach, P. Fochuk, A. Bolotnikov, R. James

引用次数: 0

Ground-based testbed design for evaluation of point, acquisition, and tracking control systems in optical inter-satellite links between two 6U nanosatellites 用于评估两颗6U纳米卫星间光学卫星间链路中的点、采集和跟踪控制系统的地基试验台设计

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2676191

Ohgan Kim, Yonghwan Kim, J. Choi, Seongick Cho, Seonghui Kim, S. Seong, Sang-Young Park

{"title":"Ground-based testbed design for evaluation of point, acquisition, and tracking control systems in optical inter-satellite links between two 6U nanosatellites","authors":"Ohgan Kim, Yonghwan Kim, J. Choi, Seongick Cho, Seonghui Kim, S. Seong, Sang-Young Park","doi":"10.1117/12.2676191","DOIUrl":"https://doi.org/10.1117/12.2676191","url":null,"abstract":"This paper discusses a testbed that implements a beam acquisition and tracking system essential for inter-satellite optical communication. It summarizes the results of optical and control system design. Recent research on free-space optical communication has been thriving due to the increasing demand for data transmission in clustered operations of small satellites. However, since the distances between satellites are often hundreds of kilometers, a beam acquisition and tracking system is necessary to establish communication by accurately detecting and tracking the position of the target satellite. The optical system of the testbed, developed by Telepix, shows the attenuated output and flatness of wavefront propagated over long distances. The control system applies an adaptive control method to manage disturbances, resulting in the successful reduction of beam pointing errors to the desired level, as demonstrated by simulation results. In the future, this technology holds potential for various applications, including clustered operations of small satellites using free-space optical communication, as well as communication between ground stations and deep-space optical communication.","PeriodicalId":434863,"journal":{"name":"Optical Engineering + Applications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114718087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the metal nature on the I-V characteristics of CdTe diodes for ionizing radiation detectors 金属性质对电离辐射探测器用CdTe二极管I-V特性的影响

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2676538

V. Sklyarchuk, V. Gnatyuk, T. Aoki

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Preparing for cost-effective soft x-ray metrology for 3D chip architecture 为3D芯片架构的低成本软x射线测量做准备

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.3004518

hen-Kuan Chou, Don McDaniel, Debbie Gustafson, Chris Lee, D. Reisman

引用次数: 0

Concept and demonstration for a method of integrating depolarization in a slit homogenizer for spectrometry applications 用于光谱应用的狭缝均质器积分去极化方法的概念和演示

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2675827

Gabrielle Beach, D. Sabatke, M. Cowell, J. Leitch, B. Farris, P. Oakley, Robyn M. O’Connor

{"title":"Concept and demonstration for a method of integrating depolarization in a slit homogenizer for spectrometry applications","authors":"Gabrielle Beach, D. Sabatke, M. Cowell, J. Leitch, B. Farris, P. Oakley, Robyn M. O’Connor","doi":"10.1117/12.2675827","DOIUrl":"https://doi.org/10.1117/12.2675827","url":null,"abstract":"The accuracy of satellite remote sensing of trace gases by imaging spectrometers depends highly on the uniformity of the instrument spectral response function. Studies have shown that scene inhomogeneity across the spectrometer’s slit width (spectral direction) can cause errors in the measured spectral radiances, leading to trace gas retrieval inaccuracy. One mitigation approach recent imaging spectrometers use is a slit homogenizer to redistribute scene radiance within the slit. This on-board hardware device functions like a slab waveguide, with rays making multiple bounces between narrowly spaced, highly reflective, plane-parallel mirrors. This presents a challenge as any difference in s- and p-polarization reflectance for the mirror surfaces tends to multiply with each bounce, producing a net linear polarization sensitivity (LPS) in the system’s throughput which also results in retrieval error. Our solution is a slit homogenizer design that mitigates for LPS by employing total internal reflection (TIR) and a birefringent internal medium. TIR ensures high and equal reflectance while a birefringent material such as sapphire, with an appropriately oriented optic axis, provides high-order retardance between bounces. This introduces polarization scrambling in the manner of a Lyot-depolarizer. We provide a basic analysis of the device’s geometrical optics, detailing the crystalline optic axis orientation for the device cut from a sapphire boule and readily-available R-cut material. Preliminary lab testing was performed on three mirror-pair and two sapphire plate homogenizers at multiple visible wavelengths. The results show that our sapphire plate slit homogenizers decrease LPS by at least an order of magnitude compared to the mirror-based ones.","PeriodicalId":434863,"journal":{"name":"Optical Engineering + Applications","volume":"639 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122952896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sequential reset method of phase shifter in beam phase control 波束相位控制中移相器的顺序复位方法

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2676243

Yuxin Jiang, Jianfeng Sun, Peipei Hou, Weijie Ren, Lingling Xu, Chaoyang Li, Longkun Zhang, Hanrui Pan, Wendi Gao

{"title":"Sequential reset method of phase shifter in beam phase control","authors":"Yuxin Jiang, Jianfeng Sun, Peipei Hou, Weijie Ren, Lingling Xu, Chaoyang Li, Longkun Zhang, Hanrui Pan, Wendi Gao","doi":"10.1117/12.2676243","DOIUrl":"https://doi.org/10.1117/12.2676243","url":null,"abstract":"In the phase control of multiple beams, when multiple phase shifters reach the boundary at the same time, the traditional method is to reset multiple phase shifters at the same time. However, this approach leads to a significant drop in the combined beam optical power. To address this issue, we propose a new reset method. This method resets the phase shifters that reach the boundary at the same time in sequence. It helps to avoid the problems that cause large phase fluctuations and dramatic decreases in optical power. This paper presents the principle of coherent multibeam beam combining and compares the power fluctuations resulting from two different resetting methods. Theoretical derivations and numerical simulations are employed to analyze the effects. The results demonstrate that the sequential reset method yields smaller power jitter compared to the traditional reset method. Furthermore, the suppression of power jitter becomes more pronounced as the number of beams reaching the boundary simultaneously increases. To validate the feasibility of the sequential reset method, an experimental system is constructed. The experimental results reveal a remarkable 36.78% improvement in power stability when compared to the traditional reset method.","PeriodicalId":434863,"journal":{"name":"Optical Engineering + Applications","volume":"12691 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130831078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automatic bias control technology of IQ modulator for optical QPSK transmitter based on envelope detection 基于包络检测的QPSK光发射机IQ调制器自动偏置控制技术

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2675692

Weijie Ren, Jianfeng Sun, Hongshun Ye

{"title":"Automatic bias control technology of IQ modulator for optical QPSK transmitter based on envelope detection","authors":"Weijie Ren, Jianfeng Sun, Hongshun Ye","doi":"10.1117/12.2675692","DOIUrl":"https://doi.org/10.1117/12.2675692","url":null,"abstract":"The optical in-phase and quadrature (IQ) modulator is a crucial component in coherent optical communication transmitter. An automatic bias control technology of optical IQ modulator for optical quadrature phase-shift keying (QPSK) transmitter based on envelope detection is proposed in this paper. The implementation basis of this method is provided and the feasibility of this method has been demonstrated through experiments. This method applies dither signals to the three direct current (DC) arms of optical IQ modulator in time sharing, and provides envelope detection to the feedback optical-to-electrical signal, and controls the real-time DC bias of the three arms according to the spectrum of the signal that completes envelope detection calculated by Fast Fourier transform (FFT). The described dither signals are all sine single frequency signals and the specific basis refers to the amplitude value of the point corresponding to the frequency of the dither signal on the spectrum. This method has simple judgment basis, and is easy to implement in practice, and does not have high requirements for the feedback photodetectors. The local optimal algorithm can serve this method well. By using this ABC method based on envelope detection, QPSK modulation was completed with an error vector amplitude (EVM) of 8.89%.","PeriodicalId":434863,"journal":{"name":"Optical Engineering + Applications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121323483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deep learning approach to vehicle pose estimation from polarimetric image data 基于偏振图像数据的车辆姿态估计的深度学习方法

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2677123

Matthew D. Siefring, B. Ratliff, Brett S. Ballard

{"title":"Deep learning approach to vehicle pose estimation from polarimetric image data","authors":"Matthew D. Siefring, B. Ratliff, Brett S. Ballard","doi":"10.1117/12.2677123","DOIUrl":"https://doi.org/10.1117/12.2677123","url":null,"abstract":"Object pose estimation is an important problem in the field of remote sensing that provides valuable information for target identification tasks. Polarization is a fundamental property of light that contains useful information about the physical properties of an object, such as shape and surface material properties. Polarization imaging has been shown to have advantages over conventional imaging techniques for object detection and feature extraction in a variety of challenging scenarios, including low light, high background clutter, and low visibility conditions. In this work, we investigate using polarimetric imaging to improve the performance of deep learning approaches to object pose estimation on a range of model target vehicles. We collect polarimetric imaging data and labeled ground truth pose data on the target vehicles in a controlled solar simulation laboratory environment under precise sensor, object, and solar source geometries. We first establish baseline performance of our approach by training our network using conventional visible RGB s0 images under favorable lighting conditions. We then make use of the full linear Stokes images for each color channel in various configurations, retrain our network, and compare performance. We furthermore propose an ensemble method to combine features obtained from convolutional neural networks trained on both conventional RGB and Stokes-vector images. These obtained ensemble features are then used to train a multi-layer perceptron. Experimental results demonstrate that combining polarization imaging with conventional imaging can improve feature extraction and the accuracy of deep learning-based approaches to pose estimation.","PeriodicalId":434863,"journal":{"name":"Optical Engineering + Applications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125734892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental characterization of entanglement characteristics in free-space quantum communication links 自由空间量子通信链路纠缠特性的实验表征

Optical Engineering + Applications Pub Date : 2023-10-03 DOI: 10.1117/12.2682030

Vladimir V. Nikulin, Vijit Bedi, Ka. Soderberg, Paul Alsing, L. Wessing, P. Ricci, John W. Heinig, William F. Lipe

{"title":"Experimental characterization of entanglement characteristics in free-space quantum communication links","authors":"Vladimir V. Nikulin, Vijit Bedi, Ka. Soderberg, Paul Alsing, L. Wessing, P. Ricci, John W. Heinig, William F. Lipe","doi":"10.1117/12.2682030","DOIUrl":"https://doi.org/10.1117/12.2682030","url":null,"abstract":"The primary focus of this paper is high-performance quantum communication systems that facilitate secure data transfer via free-space links. We consider an approach that uses correlated photon pairs generated in such a way that their polarizations are entangled and can be used to support quantum encryption protocols. However, when deployed in free space, these links can be affected by channel distortion, primarily via the spatial and temporal fields of the refractive index along the propagation path. In classical links, these fields alter the optical wave front characteristics; however, this mechanism does not directly apply to the quantum states utilized in single-photon or entangled photon protocols. Transmitting signals with quantum-based encryption creates a realm of problems, not related to wave front distortions, but rather to integrity of the quantum states after the signals propagate over free-space channels. We study these phenomena by implementing a laboratory testbed capable of creating a turbulent environment using atmospheric chambers developed by the AFRL. It is then used for experimental investigation of quantum entanglement after photon pairs are propagated both collinearly and via separate paths.","PeriodicalId":434863,"journal":{"name":"Optical Engineering + Applications","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133822373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0