Aolong Sun, Sizhe Xing, An Yan, Xuyu Deng, Zhongya Li, Guoqiang Li, Penghao Luo, Nan Chi, Junwen Zhang
We demonstrated the inverse design of a multifunctional silicon photonic device named wavelength demultiplexing power splitter (WDPS) which can realize dual-band (1310/1550 nm) demultiplexing and 1:1 power splitting simultaneously. We proposed a novel two-step hybrid binary-analog optimization (TH-BAO) method that combines two distinct optimization techniques: direct binary search (DBS) for binary pixel-state optimization and particle swarm optimization (PSO) for analog pixel-position optimization. Compared with the traditional DBS method, the TH-BAO method achieves comparable optimization performance with a reduction of the total simulation runs by 29.2%. The inverse-designed WDPS achieves insertion losses of 0.76 dB and 1.19 dB, as well as channel crosstalks of -17.96 dB and -11.20 dB at 1310 nm and 1550 nm, respectively. Furthermore, the dual-band functionality of our device can efficiently support the development of next-generation passive optical networks.
{"title":"Inverse design of a dual-band wavelength demultiplexing power splitter based on two-step hybrid binary-analog optimization","authors":"Aolong Sun, Sizhe Xing, An Yan, Xuyu Deng, Zhongya Li, Guoqiang Li, Penghao Luo, Nan Chi, Junwen Zhang","doi":"10.1117/12.3003635","DOIUrl":"https://doi.org/10.1117/12.3003635","url":null,"abstract":"We demonstrated the inverse design of a multifunctional silicon photonic device named wavelength demultiplexing power splitter (WDPS) which can realize dual-band (1310/1550 nm) demultiplexing and 1:1 power splitting simultaneously. We proposed a novel two-step hybrid binary-analog optimization (TH-BAO) method that combines two distinct optimization techniques: direct binary search (DBS) for binary pixel-state optimization and particle swarm optimization (PSO) for analog pixel-position optimization. Compared with the traditional DBS method, the TH-BAO method achieves comparable optimization performance with a reduction of the total simulation runs by 29.2%. The inverse-designed WDPS achieves insertion losses of 0.76 dB and 1.19 dB, as well as channel crosstalks of -17.96 dB and -11.20 dB at 1310 nm and 1550 nm, respectively. Furthermore, the dual-band functionality of our device can efficiently support the development of next-generation passive optical networks.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"53 1","pages":"1296605 - 1296605-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173810","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}
Horizontal atmosphere will obviously distort the light spot notably and attenuate the transmission efficiency of a laser eavesdropping. However, the contributions of ambient parameters to the transmission efficiency of laser eavesdropping are still unknown. Therefore, the influence of horizontal atmospheric fluctuation on the transmission efficiency of laser eavesdropping is investigated by carrying out theoretical analysis and validation. The mean and standard deviation of the fluctuation of the ambient variables are adopted to analyze the influence on the transmission efficiency and the statistical conclusions are attained, which can be used to predict the mean transmission efficiency. To improve the transmission efficiency, a new method based on Gerchberg-Saxton (GS) phase retrieval algorithm is proposed by integrating a Nicol grating into the optical system, hence the configuration is simple and the size is compact. The experimental results reveal that the transmission efficiency is notably improved after GS correction. The proposed method is proved to be feasible.
{"title":"The influence of the horizontal atmosphere on transmission efficiency of the laser eavesdropping","authors":"Lianhui Zheng, Xiaofu Xu, Xiaoyan Wang, Zhongjian Gao, Bingyang Liu, Huixian Lan, Yangyi Liu","doi":"10.1117/12.3000208","DOIUrl":"https://doi.org/10.1117/12.3000208","url":null,"abstract":"Horizontal atmosphere will obviously distort the light spot notably and attenuate the transmission efficiency of a laser eavesdropping. However, the contributions of ambient parameters to the transmission efficiency of laser eavesdropping are still unknown. Therefore, the influence of horizontal atmospheric fluctuation on the transmission efficiency of laser eavesdropping is investigated by carrying out theoretical analysis and validation. The mean and standard deviation of the fluctuation of the ambient variables are adopted to analyze the influence on the transmission efficiency and the statistical conclusions are attained, which can be used to predict the mean transmission efficiency. To improve the transmission efficiency, a new method based on Gerchberg-Saxton (GS) phase retrieval algorithm is proposed by integrating a Nicol grating into the optical system, hence the configuration is simple and the size is compact. The experimental results reveal that the transmission efficiency is notably improved after GS correction. The proposed method is proved to be feasible.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"197 ","pages":"1296504 - 1296504-12"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173844","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}
Jin Cheng, Jiaqing Jiao, Pang Li, Xinyan Zheng, Haoyang Zhang, Yibo Zhao, Weiguo Liu
Laser measurement system has the advantages of fast speed, high precision, and cost-effective. But the laser itself coherently produces speckles, the presence of laser speckle can seriously degrade image quality, leading to decrease in image recognition accuracy, thus reducing the accuracy of measurement. In this paper, we propose a multi-beam superposition method to reduce laser speckle. We use four lasers with equal optical power as the incident light source, then build the entire system light path by beam shaping and polarized beams superimposing, which achieves the line structured light required for the laser measurement system. According to the theoretical analysis and simulation optimization, the speckle contrast was reduced to 50% of the original value in this way. After beam shaping, we can obtain the linear laser beam with a line width of less than 1mm, a field of view angle of 66.8°, a light energy loss of less than 10% and an energy uniformity of 97.25% at a projection distance of 1000mm.The above results highlight a viable approach to decrease speckle contrast and measurement errors. This system can achieve high power and low speckle contrast light sources in the field of measurement, with outstanding result in practicability and convenience. On the other hand, this system can effectively solve the problems of serious error and low efficiency in measurement.
{"title":"Optical design of speckle suppression in laser measurement system","authors":"Jin Cheng, Jiaqing Jiao, Pang Li, Xinyan Zheng, Haoyang Zhang, Yibo Zhao, Weiguo Liu","doi":"10.1117/12.3005402","DOIUrl":"https://doi.org/10.1117/12.3005402","url":null,"abstract":"Laser measurement system has the advantages of fast speed, high precision, and cost-effective. But the laser itself coherently produces speckles, the presence of laser speckle can seriously degrade image quality, leading to decrease in image recognition accuracy, thus reducing the accuracy of measurement. In this paper, we propose a multi-beam superposition method to reduce laser speckle. We use four lasers with equal optical power as the incident light source, then build the entire system light path by beam shaping and polarized beams superimposing, which achieves the line structured light required for the laser measurement system. According to the theoretical analysis and simulation optimization, the speckle contrast was reduced to 50% of the original value in this way. After beam shaping, we can obtain the linear laser beam with a line width of less than 1mm, a field of view angle of 66.8°, a light energy loss of less than 10% and an energy uniformity of 97.25% at a projection distance of 1000mm.The above results highlight a viable approach to decrease speckle contrast and measurement errors. This system can achieve high power and low speckle contrast light sources in the field of measurement, with outstanding result in practicability and convenience. On the other hand, this system can effectively solve the problems of serious error and low efficiency in measurement.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"32 1","pages":"129590K - 129590K-8"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174100","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}
Haidong Xue, Xin Shi, Xuanqing Bai, Jian Wang, Chuanwei Luo, Lei Song, Danqun Zhang, hongbo yin, Xiaojuan Lin, Lu Zhang, Qi Wu, ruogang wang
Visible light communication has advantages such as high speed, broadband, green, safety, and low cost. Moreover, visible light communication is not subject to electromagnetic interference, so it is useful in a wide range of application scenarios such as aviation, hospitals, and mines. However, due to the limited spectrum and coverage provided by a single LED, multiple LED coverage is adopted in the indoor layout to provide seamless connection, which also brings spectrum interference in overlapping areas. This paper proposes an indoor visible light interference suppression method based on the backward forward markup (BFM) algorithm. This method not only solves the problem of spectral interference, but also improves throughput while ensuring user fairness. The simulation results show that the BFM algorithm has brought significantly improvements in various aspects, with system throughput increased by 75% and fairness factor increased by 0.3.
可见光通信具有高速、宽带、绿色、安全和低成本等优点。此外，可见光通信不受电磁干扰，因此在航空、医院、矿山等应用场景中具有广泛的实用性。然而，由于单个 LED 提供的频谱和覆盖范围有限，在室内布局中采用多个 LED 覆盖以提供无缝连接，这也带来了重叠区域的频谱干扰。本文提出了一种基于后向前移标记（BFM）算法的室内可见光干扰抑制方法。该方法不仅解决了频谱干扰问题，还在确保用户公平性的同时提高了吞吐量。仿真结果表明，BFM 算法在各方面都有明显改善，系统吞吐量提高了 75%，公平系数提高了 0.3。
{"title":"Research on interference suppression methods for indoor visible light communication","authors":"Haidong Xue, Xin Shi, Xuanqing Bai, Jian Wang, Chuanwei Luo, Lei Song, Danqun Zhang, hongbo yin, Xiaojuan Lin, Lu Zhang, Qi Wu, ruogang wang","doi":"10.1117/12.3000458","DOIUrl":"https://doi.org/10.1117/12.3000458","url":null,"abstract":"Visible light communication has advantages such as high speed, broadband, green, safety, and low cost. Moreover, visible light communication is not subject to electromagnetic interference, so it is useful in a wide range of application scenarios such as aviation, hospitals, and mines. However, due to the limited spectrum and coverage provided by a single LED, multiple LED coverage is adopted in the indoor layout to provide seamless connection, which also brings spectrum interference in overlapping areas. This paper proposes an indoor visible light interference suppression method based on the backward forward markup (BFM) algorithm. This method not only solves the problem of spectral interference, but also improves throughput while ensuring user fairness. The simulation results show that the BFM algorithm has brought significantly improvements in various aspects, with system throughput increased by 75% and fairness factor increased by 0.3.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"68 ","pages":"129620I - 129620I-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174339","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}
Convolutional neural network (CNN) has attracted widespread attention in image feature extraction and speech recognition owing to greatly reducing the complexity of model parameters and the number of weights, but it cannot be separated from the support of hardware accelerator. The limitations of electronic devices in terms of power, speed, and size make it difficult for current electron accelerators to meet the computational power requirements of future large-scale convolution operations. Here, we proposed a photonic vector architecture. This structure combines time, space and wavelength, and the non-volatile phase change material and the integrated microcomb form an optical matrix multiplier to realize memory calculation, thus reducing the energy consumption of reading weight data. The tooth spacing of the integrated microcomb is more than 100 GHz, and the microcomb coverage is from 1510 nm to 1610 nm. Finally, we replace the weight values in the CNN with the optimal weight values that the optics can achieve. The final recognition accuracy reached 97.04%, which is comparable to the efficiency of the first electronic equipment. Our results could be helpful for the development of non-volatile and ultra-fast optical neural network (ONN) with feathers of low energy consumption and high integration.
{"title":"Non-volatile and ultra-fast photonic vector accelerator with optical phase change materials and integrated microcomb","authors":"Yuanyun Wang, Lehan Zhao, Qingsong Bai, Jin Deng, Zihan Shen, Haitang Li, Zhengmao Wu, Jiagui Wu, Guangqiong Xia","doi":"10.1117/12.3007875","DOIUrl":"https://doi.org/10.1117/12.3007875","url":null,"abstract":"Convolutional neural network (CNN) has attracted widespread attention in image feature extraction and speech recognition owing to greatly reducing the complexity of model parameters and the number of weights, but it cannot be separated from the support of hardware accelerator. The limitations of electronic devices in terms of power, speed, and size make it difficult for current electron accelerators to meet the computational power requirements of future large-scale convolution operations. Here, we proposed a photonic vector architecture. This structure combines time, space and wavelength, and the non-volatile phase change material and the integrated microcomb form an optical matrix multiplier to realize memory calculation, thus reducing the energy consumption of reading weight data. The tooth spacing of the integrated microcomb is more than 100 GHz, and the microcomb coverage is from 1510 nm to 1610 nm. Finally, we replace the weight values in the CNN with the optimal weight values that the optics can achieve. The final recognition accuracy reached 97.04%, which is comparable to the efficiency of the first electronic equipment. Our results could be helpful for the development of non-volatile and ultra-fast optical neural network (ONN) with feathers of low energy consumption and high integration.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"138 1","pages":"1296623 - 1296623-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175059","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}
Zhengquan Qian, Chuanyi Tao, Jingke Li, Fuxiang Peng, Tao Guo, Cheng Feng, Jianjun Xiao, Ping Su
Two-wave mixing interferometry based on photorefractive crystals stands out among many techniques for monitoring dynamic strain because it can provide multiple dynamic sensing and does not require electronic feedback to actively compensate for any quasi-static drift. However, the traditional optical signal sensing processing system has shortcomings such as large, occupied space, various types of optical components, and complex optical path structure, which is not conducive to practical applications. Thanks to the development of photonic integrated circuits, photonic integrated can effectively solve these shortcomings. In this paper, based on the experimental study of two-wave mixing interferometry in InP:Fe spatial optics configuration, a photonic integrated two-wave mixing photorefractive interferometer is designed, which consists of curved waveguide, directional couple, unbalanced Mach-Zehnder interferometer structure, crossed waveguide, electrodes, etc. To minimize the loss of light in transmission and achieve the best demodulation performance for a two-wave mixing photorefractive interferometer, each structure is optimized by finite element method simulations. The feasibility of the optimized structure is verified in theory and the demodulation curve of transmitted signal light varying with time is obtained.
{"title":"Photonic circuit design of adaptive two-wave mixing photorefractive interferometer","authors":"Zhengquan Qian, Chuanyi Tao, Jingke Li, Fuxiang Peng, Tao Guo, Cheng Feng, Jianjun Xiao, Ping Su","doi":"10.1117/12.3006026","DOIUrl":"https://doi.org/10.1117/12.3006026","url":null,"abstract":"Two-wave mixing interferometry based on photorefractive crystals stands out among many techniques for monitoring dynamic strain because it can provide multiple dynamic sensing and does not require electronic feedback to actively compensate for any quasi-static drift. However, the traditional optical signal sensing processing system has shortcomings such as large, occupied space, various types of optical components, and complex optical path structure, which is not conducive to practical applications. Thanks to the development of photonic integrated circuits, photonic integrated can effectively solve these shortcomings. In this paper, based on the experimental study of two-wave mixing interferometry in InP:Fe spatial optics configuration, a photonic integrated two-wave mixing photorefractive interferometer is designed, which consists of curved waveguide, directional couple, unbalanced Mach-Zehnder interferometer structure, crossed waveguide, electrodes, etc. To minimize the loss of light in transmission and achieve the best demodulation performance for a two-wave mixing photorefractive interferometer, each structure is optimized by finite element method simulations. The feasibility of the optimized structure is verified in theory and the demodulation curve of transmitted signal light varying with time is obtained.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"95 4","pages":"129591O - 129591O-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175062","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}
Zibo Jiang, Xinnan Li, Bo Li, Zhe Chen, Kunxin Chen, Fengpu Wang
The splicing sub mirrors of the Thirty Meter Telescope(TMT) primary mirror are off-axis aspheric shapes with large aspheric value. In order to reduce the time of stressed mirror annular polishing(SMAP), the mirror surface will be fine grinding using computer numerical control (CNC) processing device based on a six axis robotic arm before SMAP process, and the segment mirror will be lapping quickly benefit by high removal efficiency of fine grinding compared to polishing. In this article the principles of CNC processing, robotic arm motion controlling, and the experiment of fine grinding removal function are introduced. Finally, the segment mirror of TMT at the out edge is processed, and the fabrication convergence curve and final surface residual distribution are obtained. The optimized machining experience can further shorten the processing time and be used for early aspheric process of segments.
{"title":"Small tool grinding of the large aperture segment mirror based on six axis robotic arm","authors":"Zibo Jiang, Xinnan Li, Bo Li, Zhe Chen, Kunxin Chen, Fengpu Wang","doi":"10.1117/12.3007785","DOIUrl":"https://doi.org/10.1117/12.3007785","url":null,"abstract":"The splicing sub mirrors of the Thirty Meter Telescope(TMT) primary mirror are off-axis aspheric shapes with large aspheric value. In order to reduce the time of stressed mirror annular polishing(SMAP), the mirror surface will be fine grinding using computer numerical control (CNC) processing device based on a six axis robotic arm before SMAP process, and the segment mirror will be lapping quickly benefit by high removal efficiency of fine grinding compared to polishing. In this article the principles of CNC processing, robotic arm motion controlling, and the experiment of fine grinding removal function are introduced. Finally, the segment mirror of TMT at the out edge is processed, and the fabrication convergence curve and final surface residual distribution are obtained. The optimized machining experience can further shorten the processing time and be used for early aspheric process of segments.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"85 ","pages":"129640L - 129640L-11"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175295","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}
Anna Zhao, Tianhe Wang, Lina Zhao, Hongyu Zhang, Hongyan Jiang, Chuo Li, Feng Gao
Steel structure has been widely used in modern buildings due to their excellent building performance, but their poor fire resistance requires special coating which can resistant fire for protection. With the increasing demand for fire-resistant coatings for steel structure, fire-resistant coatings with different fire-retardant mechanisms have emerged one after another. The market complexity has increased, and there is a significant difference in fire resistance performance among products, requiring real-time and effective supervision by the relevant department. However, due to the wide variety of fire-resistant coatings and the complexity of standard detecting methods, it brings difficulties for fire supervision and on-site inspection of fire-resistant coatings. The research proposed an efficient method based spectral analysis to detect the fire-resistant coatings with different fire resistive mechanisms, including both intumescent coatings and non-intumescent coating. Principal component analysis is used to quickly identify the spectral consistency of different coatings. The experiment selected samples of fire-resistant coatings with excellent performance verified by standard detection methods and ordinary one for visible to shortwave infrared 400-2500nm spectral collection and spectral feature analysis. The experimental result indicates that samples of high-performance fireproof coatings have high consistency in spectral feature. Through intelligent recognition algorithms, coating samples with unsatisfactory performance can be quickly and accurately detected. The research has shown that the intelligent spectral imaging technology is expected to provide a reliable basis for rapid on-site identification of fire resistive coatings for steel structure.
{"title":"Research on consistency discrimination method of fire resistive coating for steel structure based spectral imaging technology","authors":"Anna Zhao, Tianhe Wang, Lina Zhao, Hongyu Zhang, Hongyan Jiang, Chuo Li, Feng Gao","doi":"10.1117/12.3007822","DOIUrl":"https://doi.org/10.1117/12.3007822","url":null,"abstract":"Steel structure has been widely used in modern buildings due to their excellent building performance, but their poor fire resistance requires special coating which can resistant fire for protection. With the increasing demand for fire-resistant coatings for steel structure, fire-resistant coatings with different fire-retardant mechanisms have emerged one after another. The market complexity has increased, and there is a significant difference in fire resistance performance among products, requiring real-time and effective supervision by the relevant department. However, due to the wide variety of fire-resistant coatings and the complexity of standard detecting methods, it brings difficulties for fire supervision and on-site inspection of fire-resistant coatings. The research proposed an efficient method based spectral analysis to detect the fire-resistant coatings with different fire resistive mechanisms, including both intumescent coatings and non-intumescent coating. Principal component analysis is used to quickly identify the spectral consistency of different coatings. The experiment selected samples of fire-resistant coatings with excellent performance verified by standard detection methods and ordinary one for visible to shortwave infrared 400-2500nm spectral collection and spectral feature analysis. The experimental result indicates that samples of high-performance fireproof coatings have high consistency in spectral feature. Through intelligent recognition algorithms, coating samples with unsatisfactory performance can be quickly and accurately detected. The research has shown that the intelligent spectral imaging technology is expected to provide a reliable basis for rapid on-site identification of fire resistive coatings for steel structure.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"35 4","pages":"129631C - 129631C-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175376","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}
Cylindrical vector beams(CVBs) are spatially non-uniform polarization distributions. It has been widely used in microscopic imaging, particle manipulation, beam shaping, and other fields. Accurate measurement of the CVBs polarization state distribution is one of the research problems. In order to analyze the influence of systematic errors on the CVBs polarization parameters, the measurement errors of the polarization azimuthal AOP under annular sampling are investigated in this paper. Firstly, the generation of CVBs and the measurement principle of Stokes parametric method is introduced; secondly, the radial and angular vector beam intensity images and the AOP distribution under different annular sampling are simulated; then, the variation of R=256 intensity error IΔ with the polarization azimuth error θ in the range of [-2°,2°] is analyzed. Finally, the single error and the coupling error are analyzed and discussed. The simulation results show that the intensity errors IΔ1 and IΔ2 are the same with the θ, and IΔ3 and IΔ4 are the same with the θ. Under the single error, the absolute error values of the AOPs with mutual residual angles are similar. The maximum absolute error of AOP of IΔ1 and IΔ2 is 1° (@45°) and the maximum relative error is 2.59% (@30°); the maximum absolute error of AOP of IΔ3 and IΔ4 is 1°(@0°) and the maximum relative error is 5.12% (@15°). Under the coupling error, the absolute AOP error of IΔ1 and IΔ2 increases with the increase θ, with the maximum value of 2° (@45°) and the maximum relative error of 5.25% (@30°); the absolute AOP error of IΔ3 and IΔ4 decreases with the increase of θ, with the maximum value of 2°(@0°), with a relative maximum error of 10.40% (@15°). The study provides an error data reference for CVBs polarization detection. It can provide technical support for the application of CVBs in different fields.
{"title":"Annular sampling cylindrical vector beam polarization measurement error analysis based on the Stokes parameter method","authors":"Ling-ying Chang, Liang Chi, Kui Chen, Yuehong Qiu, Jiayi Li, Youbiao Zhang","doi":"10.1117/12.3007450","DOIUrl":"https://doi.org/10.1117/12.3007450","url":null,"abstract":"Cylindrical vector beams(CVBs) are spatially non-uniform polarization distributions. It has been widely used in microscopic imaging, particle manipulation, beam shaping, and other fields. Accurate measurement of the CVBs polarization state distribution is one of the research problems. In order to analyze the influence of systematic errors on the CVBs polarization parameters, the measurement errors of the polarization azimuthal AOP under annular sampling are investigated in this paper. Firstly, the generation of CVBs and the measurement principle of Stokes parametric method is introduced; secondly, the radial and angular vector beam intensity images and the AOP distribution under different annular sampling are simulated; then, the variation of R=256 intensity error IΔ with the polarization azimuth error θ in the range of [-2°,2°] is analyzed. Finally, the single error and the coupling error are analyzed and discussed. The simulation results show that the intensity errors IΔ1 and IΔ2 are the same with the θ, and IΔ3 and IΔ4 are the same with the θ. Under the single error, the absolute error values of the AOPs with mutual residual angles are similar. The maximum absolute error of AOP of IΔ1 and IΔ2 is 1° (@45°) and the maximum relative error is 2.59% (@30°); the maximum absolute error of AOP of IΔ3 and IΔ4 is 1°(@0°) and the maximum relative error is 5.12% (@15°). Under the coupling error, the absolute AOP error of IΔ1 and IΔ2 increases with the increase θ, with the maximum value of 2° (@45°) and the maximum relative error of 5.25% (@30°); the absolute AOP error of IΔ3 and IΔ4 decreases with the increase of θ, with the maximum value of 2°(@0°), with a relative maximum error of 10.40% (@15°). The study provides an error data reference for CVBs polarization detection. It can provide technical support for the application of CVBs in different fields.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"43 ","pages":"129590R - 129590R-13"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175649","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}
Shaochun Xie, Haiyan Luo, Zhiwei Li, Yi Din, Xiong Wei
In order to improve the real-time performance of the division-of-time polarization imaging system applied in dynamic scenes, the traditional rotating polarizer imaging scheme is improved and a fast-rotating polarization imaging system is designed. The scheme of the camera exposing during the uniform rotating of the polarizer is applied in the system, and the intensity images of different polarization angles are collected when a designed hollow turntable drive the polarizer to rotate rapidly. Based on the brief introduction of the principle of the polarization imaging system of fast rotating polarizer, the optical-mechanical structure design and core components of the system are introduced in detail, and the polarization imaging experiment of the system is carried out. The pipeline calculation method and the least square method are used to solve 5 adjacent intensity images of the target scene every time to calculate the degree of linear polarization (DoLP) and the angle of polarization (AoP). The test results show that the system can get polarization images at a frame rate of 80 frames per second (FPS) or with the pixels of 1280×1180. It is shown that when the imaging frame rate is 51 FPS, the polarization images obtained by solving 5 consecutive frames of intensity images have better detail recognition ability than those obtained by solving 3 consecutive frames of intensity images. Compared with the division-of-time polarization imaging system of the start-stop rotating polarizer, this division-of-time polarization imaging system with fast rotating polarizer increases the polarization imaging frame rate, improves the real-time performance, and enhances the detection ability to dynamic scenes.
{"title":"Design and verification of fast-rotating polarization imaging system in dynamic scenes","authors":"Shaochun Xie, Haiyan Luo, Zhiwei Li, Yi Din, Xiong Wei","doi":"10.1117/12.3007653","DOIUrl":"https://doi.org/10.1117/12.3007653","url":null,"abstract":"In order to improve the real-time performance of the division-of-time polarization imaging system applied in dynamic scenes, the traditional rotating polarizer imaging scheme is improved and a fast-rotating polarization imaging system is designed. The scheme of the camera exposing during the uniform rotating of the polarizer is applied in the system, and the intensity images of different polarization angles are collected when a designed hollow turntable drive the polarizer to rotate rapidly. Based on the brief introduction of the principle of the polarization imaging system of fast rotating polarizer, the optical-mechanical structure design and core components of the system are introduced in detail, and the polarization imaging experiment of the system is carried out. The pipeline calculation method and the least square method are used to solve 5 adjacent intensity images of the target scene every time to calculate the degree of linear polarization (DoLP) and the angle of polarization (AoP). The test results show that the system can get polarization images at a frame rate of 80 frames per second (FPS) or with the pixels of 1280×1180. It is shown that when the imaging frame rate is 51 FPS, the polarization images obtained by solving 5 consecutive frames of intensity images have better detail recognition ability than those obtained by solving 3 consecutive frames of intensity images. Compared with the division-of-time polarization imaging system of the start-stop rotating polarizer, this division-of-time polarization imaging system with fast rotating polarizer increases the polarization imaging frame rate, improves the real-time performance, and enhances the detection ability to dynamic scenes.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"3 3","pages":"1296313 - 1296313-13"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175805","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}
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