光纤离轴抛物面反射准直器的准直误差特性分析  

Analysis of Collimation Errors in Off-axis Parabolic Reflective Fiber Collimators

作　　者：唐靓[1,2] 叶慧琪[1,2] 郝志博 肖东[1,2,3] TANG Liang;YE Huiqi;HAO Zhibo;XIAO Dong(National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,南京210042 [2]中国科学院天文光学技术重点实验室,南京天文光学技术研究所,南京210042 [3]中国科学院大学,北京100049

出　　处：《光子学报》2023年第5期212-230,共19页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11903060);国科学院青年创新促进会(No.2023068);中国博士后科学基金资助项目(No.2020M671638);江苏省博士后科研资助计划项目;中国科学院天文台站设备更新及重大仪器设备运行专项经费;中国科学院重大科研仪器研制项目(No.ZDKYYQ20220009)。

摘　　要：为明确输入光纤及其定位误差对光纤离轴抛物面反射准直器出射光准直特性的影响,采用光线追迹法,针对不同光纤的实测输出,进行仿真研究。结果表明,同样的准直器参数下,输入光纤纤径越粗,对旋转定位误差越敏感,输入光纤纤径越细,对位移定位误差越敏感。相同的反射焦距下,大离轴角、短母焦距准直器下出射光束指向更稳定;小离轴角、长母焦距准直器下出射光束的角度能量分布更稳定。研究结果为高精度法布里-珀罗定标源等角度能量分布敏感光学系统中的准直器参数设计和光机结构稳定性要求提供了参考。In this paper,the influence of mirror parameters,fiber type and positioning error on the collimation quality of an off-axis parabolic reflective fiber collimator is simulated and analyzed.Compact off-axis parabolic reflective collimators with achromatic performance are widely deployed in optical systems requiring polychromatic illumination.For optical systems demanding a high level of long-term stability,fiber feeding allows for rigidification of the optical pathway,repeatable plug-in performance,and tight environmental control of the optomechanical assembly.However,light launched from the fiber end surface cannot be viewed as a perfect idealistic point source when high collimation quality is required.Different fiber core sizes,changes in far and near field energy distributions,and varying positioning errors may all affect the quality of the exit beam.From a geometric point of view,compared with axially symmetric transmissive fiber collimators,the response characteristics of the reflective off-axis parabolic collimator are more complex.Certain applications,with Fabry-Perot calibration sources for high-precision radial velocity observation and astronomical spectral calibration as a good example,are highly sensitive to changes within the angular energy distribution of the illumination condition.The radial velocity method is an important method for exoplanet detection.It measures the wavelength position changes over time of characteristic spectral lines in the star spectrum,possibly due to gravitational motions from accompany bodies.To enable detection of exoplanets residing in the habitable zone,it is necessary to achieve radial velocity measurement precision at m/s level or higher by means of simultaneous comparison with a high-precision calibration source.Fabry-Perot calibration sources have the advantages of broadband spectral coverage,uniform spectral line distribution,and robust performance for long-term continuous operation.When used in cooperation with traditional calibration sources such as thorium-argon ho

关 键 词：光纤组件 准直 光谱仪 天文光学 天文光子学 

分 类 号：O439[机械工程—光学工程]