Xianzhi Wu, Lingjie Zhang, Zhiyao Zhang, Shang-jian Zhang, Yong Liu
Performance improvement of microwave photonic frequency down-conversion link is investigated both in simulation and experiment. To achieve maximum signal-to-noise ratio, a dual-drive Mach-Zehnder modulator (DDMZM) biased at the minimum transmission point and an erbium-doped fiber amplifier (EDFA) are employed to boost the power of the first-order modulation sidebands. The power spectrum density of the output noise is limited by the thermal noise and relative intensity noise (RIN) with low and high gain of EDFA, respectively. Correspondingly, the output noise figure (NF) decreases rapidly in the case of a thermal-noise-dominant noise floor and remains stable in RIN-dominant noise floor situations. When the local oscillation (LO) and the radio frequency (RF) signal powers are set to be 10 dBm and the input optical power before photodetector (PD) is amplified to be 20 dBm, an intermediate frequency signal with a high power of 10.8 dBm is obtained. When LO/RF power is set to be 0 dBm and the amplified optical power entering the PD is 16 dBm, the NF of the proposed link is measured as 31.5 dB, which is 14 dB lower than the link without EDFA, while the conversion gain has improved to 12 dB with an increase of 57.2 dB. Finally, the spurious-free dynamic range of the link is measured as 113.3 dB·Hz 2/3 when the power of the LO signal is 0 dBm and the gain of EDFA is 18 dB.
{"title":"Research on the performance improvement of microwave photonic frequency down-conversion link","authors":"Xianzhi Wu, Lingjie Zhang, Zhiyao Zhang, Shang-jian Zhang, Yong Liu","doi":"10.1117/12.3006437","DOIUrl":"https://doi.org/10.1117/12.3006437","url":null,"abstract":"Performance improvement of microwave photonic frequency down-conversion link is investigated both in simulation and experiment. To achieve maximum signal-to-noise ratio, a dual-drive Mach-Zehnder modulator (DDMZM) biased at the minimum transmission point and an erbium-doped fiber amplifier (EDFA) are employed to boost the power of the first-order modulation sidebands. The power spectrum density of the output noise is limited by the thermal noise and relative intensity noise (RIN) with low and high gain of EDFA, respectively. Correspondingly, the output noise figure (NF) decreases rapidly in the case of a thermal-noise-dominant noise floor and remains stable in RIN-dominant noise floor situations. When the local oscillation (LO) and the radio frequency (RF) signal powers are set to be 10 dBm and the input optical power before photodetector (PD) is amplified to be 20 dBm, an intermediate frequency signal with a high power of 10.8 dBm is obtained. When LO/RF power is set to be 0 dBm and the amplified optical power entering the PD is 16 dBm, the NF of the proposed link is measured as 31.5 dB, which is 14 dB lower than the link without EDFA, while the conversion gain has improved to 12 dB with an increase of 57.2 dB. Finally, the spurious-free dynamic range of the link is measured as 113.3 dB·Hz 2/3 when the power of the LO signal is 0 dBm and the gain of EDFA is 18 dB.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963662","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}
Microchannel plate (MCP) is an advanced charged particle multiplier consisted of an arrayed microchannels glass-based material, widely used in the fields of night vision intensification, time of flight mass spectrometer, and electron microscopy. For the detection of high-energy ions, inadequate resistance of ion bombardment became the main bottleneck of microchannel plate. The cladding glass was the inner-wall of microchannels and determined the foundation of the microchannel plate. In this paper, the microchannel plate with (SrO, ZrO2) doped lead-silicate cladding glass was explored in the ion bombardment-resistant properties. Cesium ion gun, laser confocal microscope, and Vacuum Photoelectron Imaging Test Facility (VPIT) were applied to investigate the ion etching, surface morphology and the lifetime of the lead-silicate glass microchannel plate, respectively. The test results are as follows: the accumulative output charge of microchannel plate with the (SrO, ZrO2) doped lead-silicate glass and the traditional lead-silicate glass was ≥19.25 C and 3.21 C, respectively. It impacted that (SrO, ZrO2) doped lead-silicate glass certainly benefited the working life of the MCP.
微通道板（MCP）是一种先进的带电粒子倍增器，由阵列式微通道玻璃基材料组成，广泛应用于夜视增强、飞行时间质谱仪和电子显微镜等领域。对于高能离子的检测，离子轰击阻力不足成为微通道板的主要瓶颈。包层玻璃是微通道的内壁，决定了微通道板的基础。本文探讨了掺杂（SrO、ZrO2）硅酸铅包层玻璃的微通道板的抗离子轰击性能。应用铯离子枪、激光共聚焦显微镜和真空光电子成像测试设备（VPIT）分别对铅硅酸盐玻璃微通道板的离子刻蚀、表面形貌和寿命进行了研究。测试结果如下：掺杂（SrO、ZrO2）的硅酸铅玻璃和传统硅酸铅玻璃微通道板的累积输出电荷分别≥19.25 C 和 3.21 C。这表明掺杂（SrO，ZrO2）的硅酸铅玻璃肯定会延长 MCP 的工作寿命。
{"title":"Lifetime properties of microchannel plate based on the (SrO, ZrO2) doped lead-silicate glass","authors":"Hua Cai, Shangtong Li, Hui Liu, Yifei Wang, Jing Ma, Tiezhu Bo, Jinsheng Jia, Chang Liu","doi":"10.1117/12.3008052","DOIUrl":"https://doi.org/10.1117/12.3008052","url":null,"abstract":"Microchannel plate (MCP) is an advanced charged particle multiplier consisted of an arrayed microchannels glass-based material, widely used in the fields of night vision intensification, time of flight mass spectrometer, and electron microscopy. For the detection of high-energy ions, inadequate resistance of ion bombardment became the main bottleneck of microchannel plate. The cladding glass was the inner-wall of microchannels and determined the foundation of the microchannel plate. In this paper, the microchannel plate with (SrO, ZrO2) doped lead-silicate cladding glass was explored in the ion bombardment-resistant properties. Cesium ion gun, laser confocal microscope, and Vacuum Photoelectron Imaging Test Facility (VPIT) were applied to investigate the ion etching, surface morphology and the lifetime of the lead-silicate glass microchannel plate, respectively. The test results are as follows: the accumulative output charge of microchannel plate with the (SrO, ZrO2) doped lead-silicate glass and the traditional lead-silicate glass was ≥19.25 C and 3.21 C, respectively. It impacted that (SrO, ZrO2) doped lead-silicate glass certainly benefited the working life of the MCP.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963679","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}
Photonic RF direct sampling with multiple electronic analog-to-digital converters (ADCs) for time-interleaved quantization is an effective technique for digitally receiving RF signals. Since band-pass sampling is inevitable for RF direct sampling, the required total sampling rate of a photonic ADC system could be remarkably higher than the low-pass Nyquist sampling rate given by twice the bandwidth of input signal. In order to reduce the sampling rate and thus boost the efficiency of the photonic ADC hardware, we propose a method of introducing time errors between time-interleaved channels with post correcting algorithm in frequency domain. Simulation is performed based on a photonic ADC consisting of multiple 2-GSa/s sub-ADCs. A wideband signal covering the frequency band from ~4 GHz to ~9 GHz is employed as the input RF signal for direct sampling in the simulation. Reduction of the total sampling rate from the band-pass Nyquist rate of 18 GSa/s to the low-pass Nyquist rate of 10 GSa/s is achieved, through which the advantage of the proposed method is verified.
{"title":"Reduction of sampling rate in a time-interleaved photonic ADC for RF direct sampling","authors":"Xingwei Ye, Shen Dong, Jiquan Zhai, Yuhao Yang","doi":"10.1117/12.3007661","DOIUrl":"https://doi.org/10.1117/12.3007661","url":null,"abstract":"Photonic RF direct sampling with multiple electronic analog-to-digital converters (ADCs) for time-interleaved quantization is an effective technique for digitally receiving RF signals. Since band-pass sampling is inevitable for RF direct sampling, the required total sampling rate of a photonic ADC system could be remarkably higher than the low-pass Nyquist sampling rate given by twice the bandwidth of input signal. In order to reduce the sampling rate and thus boost the efficiency of the photonic ADC hardware, we propose a method of introducing time errors between time-interleaved channels with post correcting algorithm in frequency domain. Simulation is performed based on a photonic ADC consisting of multiple 2-GSa/s sub-ADCs. A wideband signal covering the frequency band from ~4 GHz to ~9 GHz is employed as the input RF signal for direct sampling in the simulation. Reduction of the total sampling rate from the band-pass Nyquist rate of 18 GSa/s to the low-pass Nyquist rate of 10 GSa/s is achieved, through which the advantage of the proposed method is verified.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138965145","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}
Dual wavelength lasers have wide applications in optical communication equipment, lidar, and other fields. The measurement and control of dual wavelength laser power ratio affect the application value of dual wavelength lasers in these fields directly. The dual wavelength dye laser used in the experiment has a wavelength difference of only several picometers. Based on this demand, our paper innovatively proposes a measurement method that using a scanning FP interferometer to characterize the power ratio. The linear correlation between spectral response and incident light power was verified through the establishment of theoretical models and experimental verification. On this basis, the optimization of optical layout design and the design of automatic recognition software can be carried out separately to achieve online monitoring of power ratio. Finally, the device was used for long-term experimental assessment, and the results showed that the comprehensive error of dual wavelength power ratio measurement based on scanning FP interferometer was less than ± 3%, which met the experimental requirements.
{"title":"Power ratio measurement of dual wavelength dye laser with picometer-level wavelength difference","authors":"Yancheng Guo, Qiunan Yang, Yuanyuan Zhang","doi":"10.1117/12.2692864","DOIUrl":"https://doi.org/10.1117/12.2692864","url":null,"abstract":"Dual wavelength lasers have wide applications in optical communication equipment, lidar, and other fields. The measurement and control of dual wavelength laser power ratio affect the application value of dual wavelength lasers in these fields directly. The dual wavelength dye laser used in the experiment has a wavelength difference of only several picometers. Based on this demand, our paper innovatively proposes a measurement method that using a scanning FP interferometer to characterize the power ratio. The linear correlation between spectral response and incident light power was verified through the establishment of theoretical models and experimental verification. On this basis, the optimization of optical layout design and the design of automatic recognition software can be carried out separately to achieve online monitoring of power ratio. Finally, the device was used for long-term experimental assessment, and the results showed that the comprehensive error of dual wavelength power ratio measurement based on scanning FP interferometer was less than ± 3%, which met the experimental requirements.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994657","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}
Shuncheng Sun, Xinrong Chen, Chao-ming Li, Gaoxiang Xu, Tao Wu, Jiayao Pan, Lei Sun
The diffraction characteristics of amplitude and phase-type soft-edge apertures with super-Gaussian transmittance at the gap of mosaic grating are investigated in this article. A well-designed soft-edge apertures can effectively suppress the Fresnel straight-edge diffraction intensity distribution at a certain transmission distance and consequently homogenize the overall light intensity on the image plane. We use the PV value, which is the difference between the maximum intensity of Fresnel diffraction and the initial incident intensity, as the evaluation index of diffraction intensity homogenization. Compared with use of the hard-edge aperture, the PV value reduces from 0.6 to 0.009 and 0.051 at the distance of 0.5m and 1m respectively with use of the super-Gaussian amplitude type soft-edge apertures designed by us. While using the super-Gaussian phase type soft-edge apertures designed by us, the PV value reduces from 0.6 to 0.053 and 0.06 at the distance of 0.5m and 1m respectively.
{"title":"Research on suppression method of straight edge diffraction effect of mosaic grating","authors":"Shuncheng Sun, Xinrong Chen, Chao-ming Li, Gaoxiang Xu, Tao Wu, Jiayao Pan, Lei Sun","doi":"10.1117/12.3005771","DOIUrl":"https://doi.org/10.1117/12.3005771","url":null,"abstract":"The diffraction characteristics of amplitude and phase-type soft-edge apertures with super-Gaussian transmittance at the gap of mosaic grating are investigated in this article. A well-designed soft-edge apertures can effectively suppress the Fresnel straight-edge diffraction intensity distribution at a certain transmission distance and consequently homogenize the overall light intensity on the image plane. We use the PV value, which is the difference between the maximum intensity of Fresnel diffraction and the initial incident intensity, as the evaluation index of diffraction intensity homogenization. Compared with use of the hard-edge aperture, the PV value reduces from 0.6 to 0.009 and 0.051 at the distance of 0.5m and 1m respectively with use of the super-Gaussian amplitude type soft-edge apertures designed by us. While using the super-Gaussian phase type soft-edge apertures designed by us, the PV value reduces from 0.6 to 0.053 and 0.06 at the distance of 0.5m and 1m respectively.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994670","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}
To improve the performance of differential transmissivity & reflectivity measurer (DFTRM) for coated mirrors with extremely low transmission or reflection loss, a novel scheme based on Fresnel formula and optical balance is demonstrated. Benefit from the characteristic of Fresnel formula, i.e., the specular reflectivity of the reference optical surface varies slowly with the incident angle near Brewster’s angle, so the precision measurement of transmissivity or reflectivity is then converted to the precision measurement of the incident angle in our two-optical-path scheme. An experimental system is set up to verify the feasibility of precision measurement, and the preliminary measurement results for high-reflectivity coated mirrors with low transmission loss prove its ability to measure transmissivity and distinguish the transmissivity difference of 10 parts per million (ppm) magnitude. Various potential error sources, including the responsivity of photodiodes, the scale factor, the polarization of the incident laser, the refractive index of the reference medium and the spatial relationship of components, are discussed qualitatively or quantitatively to provide guidance for the subsequent optimization of transmissivity & reflectivity measurer at ppm level in the future.
{"title":"A novel scheme of homologous differential transmissivity and reflectivity measurer","authors":"Deng Liu, Shirong Chen, Dingbo Chen, Zhongqi Tan","doi":"10.1117/12.3004230","DOIUrl":"https://doi.org/10.1117/12.3004230","url":null,"abstract":"To improve the performance of differential transmissivity & reflectivity measurer (DFTRM) for coated mirrors with extremely low transmission or reflection loss, a novel scheme based on Fresnel formula and optical balance is demonstrated. Benefit from the characteristic of Fresnel formula, i.e., the specular reflectivity of the reference optical surface varies slowly with the incident angle near Brewster’s angle, so the precision measurement of transmissivity or reflectivity is then converted to the precision measurement of the incident angle in our two-optical-path scheme. An experimental system is set up to verify the feasibility of precision measurement, and the preliminary measurement results for high-reflectivity coated mirrors with low transmission loss prove its ability to measure transmissivity and distinguish the transmissivity difference of 10 parts per million (ppm) magnitude. Various potential error sources, including the responsivity of photodiodes, the scale factor, the polarization of the incident laser, the refractive index of the reference medium and the spatial relationship of components, are discussed qualitatively or quantitatively to provide guidance for the subsequent optimization of transmissivity & reflectivity measurer at ppm level in the future.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994727","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}
Yue Zhang, Xinwei Wang, Pingshun Lei, Yan Zhou, Yuliang Liu
With the increasing demand for navigation, obstacle avoidance and exploration, optical cameras are increasingly installed on unmanned underwater vehicles(UUVs). In order to meet the hydrodynamic performance requirements of UUVs, optical camera needs to be equipped inside optical fairing. However, traditional optical fairing can make optical cameras defocus and distortion, due to the difference in refractive index inside and outside the optical fairing. One of the common solutions is to replace the fairing with optical flat panel, but it will increase water resistance of UUV and affect the hydrodynamic performance. Another solution is to choose an optical camera that matches the additional focal length brought by the curvature of optical fairing, so that the optical fairing becomes a part of the camera lens. But the position of optical camera and optical fairing must be set strictly and precisely. Therefore, it is impossible to flexibly change camera, lens, optical fairing, and their positions. In this paper, a novel underwater low-resistance optical fairing is proposed. The shape of optical fairing is designed streamlined to reduce water resistance, and the water-filled structure eliminates the defocus and distortion effects caused by refractive index difference. Numerical simulations are performed to analyze the aberration and distortion caused by optical fairing. Comparison experiments of the proposed optical fairing and traditional optical fairing are performed. It is shown that the proposed fairing is simple in structure and flexible in implementation, which can enable clear imaging of optical cameras, and can be easily installed to achieve better hydrodynamic performance of UUVs.
{"title":"Water-filled low-resistance optical fairing for unmanned underwater vehicles","authors":"Yue Zhang, Xinwei Wang, Pingshun Lei, Yan Zhou, Yuliang Liu","doi":"10.1117/12.3007751","DOIUrl":"https://doi.org/10.1117/12.3007751","url":null,"abstract":"With the increasing demand for navigation, obstacle avoidance and exploration, optical cameras are increasingly installed on unmanned underwater vehicles(UUVs). In order to meet the hydrodynamic performance requirements of UUVs, optical camera needs to be equipped inside optical fairing. However, traditional optical fairing can make optical cameras defocus and distortion, due to the difference in refractive index inside and outside the optical fairing. One of the common solutions is to replace the fairing with optical flat panel, but it will increase water resistance of UUV and affect the hydrodynamic performance. Another solution is to choose an optical camera that matches the additional focal length brought by the curvature of optical fairing, so that the optical fairing becomes a part of the camera lens. But the position of optical camera and optical fairing must be set strictly and precisely. Therefore, it is impossible to flexibly change camera, lens, optical fairing, and their positions. In this paper, a novel underwater low-resistance optical fairing is proposed. The shape of optical fairing is designed streamlined to reduce water resistance, and the water-filled structure eliminates the defocus and distortion effects caused by refractive index difference. Numerical simulations are performed to analyze the aberration and distortion caused by optical fairing. Comparison experiments of the proposed optical fairing and traditional optical fairing are performed. It is shown that the proposed fairing is simple in structure and flexible in implementation, which can enable clear imaging of optical cameras, and can be easily installed to achieve better hydrodynamic performance of UUVs.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994838","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}
To enhance the spatial resolution capability of transmission-mode NEA GaAs photocathodes, this study employed a white-light interferometer to measure the surface configurations of photocathode components post thermal compression bonding. Precise fitting of the surface configurations was achieved using Zernike polynomials, successfully deriving the Zernike polynomial coefficients. Further, these calculated results were integrated into optical design software for modeling, aiming to elucidate the relationship between the photocathode's transfer function and surface configurations. The findings clearly indicate that the MTF value corresponding to 60lp/mm remains stable within the 0° and 5° field angles. However, as the field angle extends to 20°, there is a significant decline in the MTF value. Among them, the transfer performance of the plano-concave photocathode decreases most prominently, followed by the flat structure, while the plano-convex structure exhibits the least decline. Overall, this research provides invaluable references for the further advancement of photocathode technology.
{"title":"Influence of deformed window glass for GaAs photocathode on light transmission","authors":"Xin Guo, Feng Shi, Tiantian Jia, Ruoyu Zhang, Hongchang Cheng, Yijun Zhang","doi":"10.1117/12.3007947","DOIUrl":"https://doi.org/10.1117/12.3007947","url":null,"abstract":"To enhance the spatial resolution capability of transmission-mode NEA GaAs photocathodes, this study employed a white-light interferometer to measure the surface configurations of photocathode components post thermal compression bonding. Precise fitting of the surface configurations was achieved using Zernike polynomials, successfully deriving the Zernike polynomial coefficients. Further, these calculated results were integrated into optical design software for modeling, aiming to elucidate the relationship between the photocathode's transfer function and surface configurations. The findings clearly indicate that the MTF value corresponding to 60lp/mm remains stable within the 0° and 5° field angles. However, as the field angle extends to 20°, there is a significant decline in the MTF value. Among them, the transfer performance of the plano-concave photocathode decreases most prominently, followed by the flat structure, while the plano-convex structure exhibits the least decline. Overall, this research provides invaluable references for the further advancement of photocathode technology.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995063","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}
The extraction of polarization features is the key to the further application of remote sensors. For conventional remote sensing, the evaluation method of polarization characteristics is polarization sensitivity, which needs to be obtained through polarization testing. For polarization remote sensing, it is necessary to obtain the polarization characteristics of the instrument through polarization calibration. Polarization correction requires not only the measurement of the polarization characteristics of the target, but also the calibration of the polarization characteristics of the instrument, and the ultimate goal is to eliminate the polarization response of the instrument. Therefore, it is necessary to carry out research on polarization feature extraction and correction technology. This paper mainly discusses the difficulties and technical approaches of current polarization feature extraction and correction, analyzes the key technologies and related progress, and provides important reference value for further improving the quantitative acquisition of target information.
{"title":"Analysis of the key techniques in polarization feature extraction and correction","authors":"Chengguang Cui, Xiaohong Zhang, Xiaolin Liu, Mengxu Li, Shengjie Zhang","doi":"10.1117/12.3005397","DOIUrl":"https://doi.org/10.1117/12.3005397","url":null,"abstract":"The extraction of polarization features is the key to the further application of remote sensors. For conventional remote sensing, the evaluation method of polarization characteristics is polarization sensitivity, which needs to be obtained through polarization testing. For polarization remote sensing, it is necessary to obtain the polarization characteristics of the instrument through polarization calibration. Polarization correction requires not only the measurement of the polarization characteristics of the target, but also the calibration of the polarization characteristics of the instrument, and the ultimate goal is to eliminate the polarization response of the instrument. Therefore, it is necessary to carry out research on polarization feature extraction and correction technology. This paper mainly discusses the difficulties and technical approaches of current polarization feature extraction and correction, analyzes the key technologies and related progress, and provides important reference value for further improving the quantitative acquisition of target information.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995105","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}
Tianxuan Feng, Tong Wu, Shuyuan Zhang, Zhiying Song, Lijing Li
With the continuous development of optical quantum sensor technology, the importance of quantum entanglement sources is growing. As an essential component of optical quantum systems, entanglement sources have broad applications in quantum communication, imaging, computing, and other fields. However, the high-power consumption and preparation costs associated with these sources hinder their integration and expansion. To address these issues, we conducted experiments using a 40mW laser diode and a typical type-II barium metaborate (BBO) crystal to prepare a low-power and low-cost quantum entanglement source. Our results show an average count of over 15,000 entangled photons per second and over 7,500 entangled photon pairs per second, which are in good agreement with theoretical analysis. We have made significant progress towards achieving the goal of low-power and low-cost entanglement sources, which will facilitate the practical application of quantum entanglement lighting and promote the wider adoption of optical quantum systems in the future.
随着光量子传感器技术的不断发展，量子纠缠源的重要性与日俱增。作为光量子系统的重要组成部分，纠缠源在量子通信、成像、计算等领域有着广泛的应用。然而，与这些源相关的高功率消耗和准备成本阻碍了它们的集成和扩展。为了解决这些问题，我们使用 40mW 激光二极管和典型的 II 型偏硼酸钡（BBO）晶体进行了实验，制备了一种低功耗、低成本的量子纠缠源。我们的研究结果表明，纠缠光子的平均计数超过了每秒 15,000 个，纠缠光子对的平均计数超过了每秒 7,500 对，这与理论分析结果非常吻合。我们在实现低功耗、低成本纠缠源的目标方面取得了重大进展，这将促进量子纠缠照明的实际应用，推动光量子系统在未来的广泛应用。
{"title":"Source of entangled photon pairs generated by low-power pump laser","authors":"Tianxuan Feng, Tong Wu, Shuyuan Zhang, Zhiying Song, Lijing Li","doi":"10.1117/12.3006764","DOIUrl":"https://doi.org/10.1117/12.3006764","url":null,"abstract":"With the continuous development of optical quantum sensor technology, the importance of quantum entanglement sources is growing. As an essential component of optical quantum systems, entanglement sources have broad applications in quantum communication, imaging, computing, and other fields. However, the high-power consumption and preparation costs associated with these sources hinder their integration and expansion. To address these issues, we conducted experiments using a 40mW laser diode and a typical type-II barium metaborate (BBO) crystal to prepare a low-power and low-cost quantum entanglement source. Our results show an average count of over 15,000 entangled photons per second and over 7,500 entangled photon pairs per second, which are in good agreement with theoretical analysis. We have made significant progress towards achieving the goal of low-power and low-cost entanglement sources, which will facilitate the practical application of quantum entanglement lighting and promote the wider adoption of optical quantum systems in the future.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995170","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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