Pub Date : 2014-01-01DOI: 10.3788/CO.20140704.0559
洪国彬 Hong Kuo-bin, 杨钧杰 Yang Chun-chieh, 卢廷昌 Lu Tien-chang
We experimentally and theoretically investigate the optical properties of GaN-based photonic crystal surface emitting lasers( PCSELs). We discuss the effects of lattice constant,boundary shape,and lattice type of photonic crystal( PC) on lasing characteristics. The PCSEL structures are fabricated using the metal-organic chemical vapor deposition,the electron beam lithography,and inductively coupled plasma reactive ion etching technique. The optical properties of PCSEL which include the diffraction pattern,emission spectrum,divergence angle and so on are measured by the angular-resolved photoluminescence system. Meanwhile,the plane wave expansion and multiple scattering method( MSM) are used to calculate the band diagram and threshold gain of PCSELs,respectively. The results reveal that the lattice constant plays an important role in selection of lasing mode. Despite the lasing wavelength and linewidth of circular and hexagonal shapes PCSELs are almost the same,the threshold excitation energy density of circular shape PCSEL is 0. 3 mJ /cm2 smaller than that ofhexagonal PCSEL. The PCSEL with honeycomb lattice shows the lower excitation energy density of1. 6 mJ /cm2 and divergence angle of 1. 3°. In case of square lattice,the excitation energy density is twice as large as that of honeycomb lattice. The overall results show that the single-mode emission,low divergence angle,and so on can be produced from GaN-based PCSEL. On the other hand,the numerical results calculated using the MSM are in good agreement with experimental results. The MSM could be a fast and cost-effective approach for predicting the lasing characteristic. We believe that these contributions provide guidance for the development of GaN-based PCSEL.
{"title":"Blue-Violet GaN-based photonic crystal surface emitting lasers","authors":"洪国彬 Hong Kuo-bin, 杨钧杰 Yang Chun-chieh, 卢廷昌 Lu Tien-chang","doi":"10.3788/CO.20140704.0559","DOIUrl":"https://doi.org/10.3788/CO.20140704.0559","url":null,"abstract":"We experimentally and theoretically investigate the optical properties of GaN-based photonic crystal surface emitting lasers( PCSELs). We discuss the effects of lattice constant,boundary shape,and lattice type of photonic crystal( PC) on lasing characteristics. The PCSEL structures are fabricated using the metal-organic chemical vapor deposition,the electron beam lithography,and inductively coupled plasma reactive ion etching technique. The optical properties of PCSEL which include the diffraction pattern,emission spectrum,divergence angle and so on are measured by the angular-resolved photoluminescence system. Meanwhile,the plane wave expansion and multiple scattering method( MSM) are used to calculate the band diagram and threshold gain of PCSELs,respectively. The results reveal that the lattice constant plays an important role in selection of lasing mode. Despite the lasing wavelength and linewidth of circular and hexagonal shapes PCSELs are almost the same,the threshold excitation energy density of circular shape PCSEL is 0. 3 mJ /cm2 smaller than that ofhexagonal PCSEL. The PCSEL with honeycomb lattice shows the lower excitation energy density of1. 6 mJ /cm2 and divergence angle of 1. 3°. In case of square lattice,the excitation energy density is twice as large as that of honeycomb lattice. The overall results show that the single-mode emission,low divergence angle,and so on can be produced from GaN-based PCSEL. On the other hand,the numerical results calculated using the MSM are in good agreement with experimental results. The MSM could be a fast and cost-effective approach for predicting the lasing characteristic. We believe that these contributions provide guidance for the development of GaN-based PCSEL.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"29 1","pages":"559-571"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80312785","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140702.0320
刘. L. Lei, 马. M. Jun, 郑玉权 Zheng Yu-quan
The mirror interval and radius of curvature of optical system including three mirrors are often changed due to the impact of space microgravity,which has a greater impact on the back focal length,and causes camera defocus and imaging quality reduction.Through the equivalent Gauss optical system analysis of three-mirror system,back focal length formula can be obtained.By homogeneous coordinate transformation,the reflection mirror rigid-body displacement formula is obtained,and a mirror radius is obtained in the microgravity environment using the least squares fitting algorithm.Finally,by calculating the camera in space microgravity environment,the defocusing amount is 0.04 mm.Results provide a theoretical basis for the design of focusing mechanism.
{"title":"Defocus range of off-axis three-mirror anastigmat (TMA) camera under space microgravity","authors":"刘. L. Lei, 马. M. Jun, 郑玉权 Zheng Yu-quan","doi":"10.3788/CO.20140702.0320","DOIUrl":"https://doi.org/10.3788/CO.20140702.0320","url":null,"abstract":"The mirror interval and radius of curvature of optical system including three mirrors are often changed due to the impact of space microgravity,which has a greater impact on the back focal length,and causes camera defocus and imaging quality reduction.Through the equivalent Gauss optical system analysis of three-mirror system,back focal length formula can be obtained.By homogeneous coordinate transformation,the reflection mirror rigid-body displacement formula is obtained,and a mirror radius is obtained in the microgravity environment using the least squares fitting algorithm.Finally,by calculating the camera in space microgravity environment,the defocusing amount is 0.04 mm.Results provide a theoretical basis for the design of focusing mechanism.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"20 1","pages":"320-325"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85097199","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140705.0830
张. Z. Min, 隋永新 Sui Yongxin, 杨怀江 Yang Huai-jiang
The stitching interferometer systems with larger relative movement will show a significantly lower positioning accuracy of subapertures. As a consequence a stitching method based on detection of artificial circular mark center to find the necessary translation between two neighborly subapertures is implemented. Firstly,we take coordinates of mark centers as the marks' coordinates by which the translation is computed. Then all the subaperture data are unified into the same reference by homogeneous coordinate transformation and the full aperture phase are stitched by using mechanical system error compensation algorithm. A subaperture stitching process for a 468 mm flat mirror was carried out including surface accuracy tests during the polishing. In this process,subaperture stitching test offered the surface data precisely for polishing,which ensured the surfaceerror converged quickly to a final RMS of 35 nm. The experimental results show that the method relaxes the precision requirement for subaperture location and can get the full aperture phase for large optical element correctly.
{"title":"Subaperture stitching interferometry based on detection of marker center","authors":"张. Z. Min, 隋永新 Sui Yongxin, 杨怀江 Yang Huai-jiang","doi":"10.3788/CO.20140705.0830","DOIUrl":"https://doi.org/10.3788/CO.20140705.0830","url":null,"abstract":"The stitching interferometer systems with larger relative movement will show a significantly lower positioning accuracy of subapertures. As a consequence a stitching method based on detection of artificial circular mark center to find the necessary translation between two neighborly subapertures is implemented. Firstly,we take coordinates of mark centers as the marks' coordinates by which the translation is computed. Then all the subaperture data are unified into the same reference by homogeneous coordinate transformation and the full aperture phase are stitched by using mechanical system error compensation algorithm. A subaperture stitching process for a 468 mm flat mirror was carried out including surface accuracy tests during the polishing. In this process,subaperture stitching test offered the surface data precisely for polishing,which ensured the surfaceerror converged quickly to a final RMS of 35 nm. The experimental results show that the method relaxes the precision requirement for subaperture location and can get the full aperture phase for large optical element correctly.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"5 1","pages":"830-836"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91053611","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}
Pub Date : 2014-01-01DOI: 10.3788/co.20140706.0962
唐杰 Tang Jie, 蔡盛 Cai Sheng, 乔彦峰 Qiao Yan-feng
{"title":"Optical system design of simulator for autonomous landing on planets based on optical navigation","authors":"唐杰 Tang Jie, 蔡盛 Cai Sheng, 乔彦峰 Qiao Yan-feng","doi":"10.3788/co.20140706.0962","DOIUrl":"https://doi.org/10.3788/co.20140706.0962","url":null,"abstract":"","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"44 16","pages":"962-968"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91505385","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140706.0942
张学明 Zhang Xue-ming
{"title":"Optical design of laser receiving and color TV confocal-window","authors":"张学明 Zhang Xue-ming","doi":"10.3788/CO.20140706.0942","DOIUrl":"https://doi.org/10.3788/CO.20140706.0942","url":null,"abstract":"","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"39 1","pages":"942-948"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80054589","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140705.0712
刘怡轩 Liu Yi-xuan, 颜昌翔 Yan Chang-xiang
The principle of color measurement is introduced,and the characteristics requirements and technical difficulties of on-line color measurement are summarized. The development process and the current state of the art of on-line color measurement technology are also presented. The specifications,applications and system structures of several advanced on-line spectrophotometes abroad are presented in detail. The characteristics and advantages of every instrument are highlighted. The development trend of on-line spectrophotometer is discussed from two aspects of technical perspective and application requirements in this paper,which will provide a reference for study on the development of on-line spectrophotometer.
{"title":"Development and status of on-line spectrophotometer","authors":"刘怡轩 Liu Yi-xuan, 颜昌翔 Yan Chang-xiang","doi":"10.3788/CO.20140705.0712","DOIUrl":"https://doi.org/10.3788/CO.20140705.0712","url":null,"abstract":"The principle of color measurement is introduced,and the characteristics requirements and technical difficulties of on-line color measurement are summarized. The development process and the current state of the art of on-line color measurement technology are also presented. The specifications,applications and system structures of several advanced on-line spectrophotometes abroad are presented in detail. The characteristics and advantages of every instrument are highlighted. The development trend of on-line spectrophotometer is discussed from two aspects of technical perspective and application requirements in this paper,which will provide a reference for study on the development of on-line spectrophotometer.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"39 5 1","pages":"712-722"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78392636","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140701.0156
杨. Y. Fei, 安其昌 An Qi-chang, 张景旭 Zhang Jing-xu
Firstly,Power Spectral Density( PSD) is proposed for mirror surface figure evaluation in the large aperture telescope system as for some difficulties for Root Mean Square( RMS) in the evaluation of large scale variety and disadvantage of robust for rigid body displacement. Then,the decomposition arithmetic of PSD is analyzed with Zernike polynomial,and Zernike polynomial spectrum energy distribution is analyzed in some order. The algorithm has been used in the surface figure evaluation of a Φ 500 mm mirror,and energy distribution in the frequency domain of the actual mirror surface has been obtained. The experimental results indicate that the evaluation of PSD is more practical when used in large aperture mirror for their manufacture and testing and for the error budget allocation in telescope system. Finally,a kind of noncorrelative sub-aperture stitching method for evaluation of reflective mirror shape based on PSD is proposed which can be used in the large aperture telescope.
{"title":"Mirror surface figure evaluation based on power spectral density","authors":"杨. Y. Fei, 安其昌 An Qi-chang, 张景旭 Zhang Jing-xu","doi":"10.3788/CO.20140701.0156","DOIUrl":"https://doi.org/10.3788/CO.20140701.0156","url":null,"abstract":"Firstly,Power Spectral Density( PSD) is proposed for mirror surface figure evaluation in the large aperture telescope system as for some difficulties for Root Mean Square( RMS) in the evaluation of large scale variety and disadvantage of robust for rigid body displacement. Then,the decomposition arithmetic of PSD is analyzed with Zernike polynomial,and Zernike polynomial spectrum energy distribution is analyzed in some order. The algorithm has been used in the surface figure evaluation of a Φ 500 mm mirror,and energy distribution in the frequency domain of the actual mirror surface has been obtained. The experimental results indicate that the evaluation of PSD is more practical when used in large aperture mirror for their manufacture and testing and for the error budget allocation in telescope system. Finally,a kind of noncorrelative sub-aperture stitching method for evaluation of reflective mirror shape based on PSD is proposed which can be used in the large aperture telescope.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"69 1","pages":"156-162"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86441862","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140701.0131
陈. C. Yun, 李艳茹 Li Yan-ru, 张红胜 Zhang Hong-sheng
In order to fabricate metallic meshes based on ZnS which can shield electromagnetic wave,a new type of photolithography copy technology process is adopted,in which photoresist is coated firstly and then plated in vacuum machine. But the color of polycrystalline ZnS resembles that of photo-resist,it is hard to estimate the developing degree of meshes during the process of making metallic meshes,which affects the preparation of metallic meshes film in the process of vacuum plating. A new method by plating a transition film is proposed,in which the processes including vacuum coating,spin-coating,developing,etching,vacuum coating,removing,etching are adopted combining the fabrication technology of metallic meshes. The testing results indicate that the metallic meshes with the line width of 8 μm and the line period of 400 μm are fabricated successfully. With this technology,the yield of metallic meshes is improved up to 90%.
{"title":"Improvement on fabrication technology of metallic mesh based on ZnS","authors":"陈. C. Yun, 李艳茹 Li Yan-ru, 张红胜 Zhang Hong-sheng","doi":"10.3788/CO.20140701.0131","DOIUrl":"https://doi.org/10.3788/CO.20140701.0131","url":null,"abstract":"In order to fabricate metallic meshes based on ZnS which can shield electromagnetic wave,a new type of photolithography copy technology process is adopted,in which photoresist is coated firstly and then plated in vacuum machine. But the color of polycrystalline ZnS resembles that of photo-resist,it is hard to estimate the developing degree of meshes during the process of making metallic meshes,which affects the preparation of metallic meshes film in the process of vacuum plating. A new method by plating a transition film is proposed,in which the processes including vacuum coating,spin-coating,developing,etching,vacuum coating,removing,etching are adopted combining the fabrication technology of metallic meshes. The testing results indicate that the metallic meshes with the line width of 8 μm and the line period of 400 μm are fabricated successfully. With this technology,the yield of metallic meshes is improved up to 90%.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"1 1","pages":"131-136"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89705666","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140703.0456
李. L. Hang, 颜昌翔 Yan Chang-xiang
In order to meet the requirement of mobile phone market on the wide-angle and high-pixel mobile phone lens,a wide-angle and 8 mega-pixel mobile phone lens is designed. The mobile phone lens are composed of 4 plastic aspheric lens and an IR filter,and the F-number is 2. 45 and FOV is 80. The sensor OV8850 made by Omnivision with 8 mega pixels,maximum resolution of 3 280 pixel × 2 464 pixel,pixel size of 1. 1 μm,and Nyquist sampling frequency of 454 lp / mm. The design result shows that the MTF value is larger than 0. 48 at 1 /2 Nyquist sampling frequency in the 0. 7 fields of view( FOV),and the MTF of FOV is larger than 0. 38. The MTF value in 0. 7 FOV is larger than 0. 15 at Nyquist sampling frequency and the distortion is less than 2%.
{"title":"Design of wide-angle lens for 8 mega-pixel mobile phone camera","authors":"李. L. Hang, 颜昌翔 Yan Chang-xiang","doi":"10.3788/CO.20140703.0456","DOIUrl":"https://doi.org/10.3788/CO.20140703.0456","url":null,"abstract":"In order to meet the requirement of mobile phone market on the wide-angle and high-pixel mobile phone lens,a wide-angle and 8 mega-pixel mobile phone lens is designed. The mobile phone lens are composed of 4 plastic aspheric lens and an IR filter,and the F-number is 2. 45 and FOV is 80. The sensor OV8850 made by Omnivision with 8 mega pixels,maximum resolution of 3 280 pixel × 2 464 pixel,pixel size of 1. 1 μm,and Nyquist sampling frequency of 454 lp / mm. The design result shows that the MTF value is larger than 0. 48 at 1 /2 Nyquist sampling frequency in the 0. 7 fields of view( FOV),and the MTF of FOV is larger than 0. 38. The MTF value in 0. 7 FOV is larger than 0. 15 at Nyquist sampling frequency and the distortion is less than 2%.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"15 1","pages":"456-461"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86288146","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}
Pub Date : 2014-01-01DOI: 10.3788/CO.20140703.0483
施建华 Shi Jian-hua, 伏思华 Fu Si-hua, 谢文科 Xie Wen-ke
Aiming at the big measuring error from grating spectrometer caused by the devices' spectral characterics,an error correction method is brought forward and validated. Firstly,the grating spectrometer's principle is analyzed deeply and the theoretical model of error correction is built. Then,the spectral characteristics of key devices,such as grating,detector,mirror etc.,are studied and the algorithm of numerical extraction is brought forward to acquire the value of each point on the spectral curve. Finally,the theoretical model and the method of numerical algorithm are used to correct the bromine-tungsten lamp's spectrum which is obtained by the grating spectrometer. The result of the experiment shows that the mean error of the numerical extraction algorithm is only 0. 39%,and the corrected spectrum is very close to the standard spectrum,which certifies that the correction method brought forward in this paper can eliminate the errors brought by the devices' spectral characteristics.
{"title":"Error correction of spectral response characteristic of grating spectrometer","authors":"施建华 Shi Jian-hua, 伏思华 Fu Si-hua, 谢文科 Xie Wen-ke","doi":"10.3788/CO.20140703.0483","DOIUrl":"https://doi.org/10.3788/CO.20140703.0483","url":null,"abstract":"Aiming at the big measuring error from grating spectrometer caused by the devices' spectral characterics,an error correction method is brought forward and validated. Firstly,the grating spectrometer's principle is analyzed deeply and the theoretical model of error correction is built. Then,the spectral characteristics of key devices,such as grating,detector,mirror etc.,are studied and the algorithm of numerical extraction is brought forward to acquire the value of each point on the spectral curve. Finally,the theoretical model and the method of numerical algorithm are used to correct the bromine-tungsten lamp's spectrum which is obtained by the grating spectrometer. The result of the experiment shows that the mean error of the numerical extraction algorithm is only 0. 39%,and the corrected spectrum is very close to the standard spectrum,which certifies that the correction method brought forward in this paper can eliminate the errors brought by the devices' spectral characteristics.","PeriodicalId":10133,"journal":{"name":"Chinese Journal of Optics and Applied Optics","volume":"1 1","pages":"483-490"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88788605","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：