光波导输入的双通道同步定标虚拟成像相位阵列光谱仪  

Dual-channel Synchronous Calibration VIPA Spectrometer with Optical Waveguide Input

作　　者：张中楠 林栋 朱小明[1,2] 王宇韬 冯吉军 何晋平 ZHANG Zhongnan;LIN Dong;ZHU Xiaoming;WANG Yutao;FENG Jijun;HE Jinping(Laboratory of Solar and Space Instruments,Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing 210042,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Shanghai for Science and Technology,School of Optical-electrical and Computer Engineering,Shanghai 200093,China;University of Chinese Academy of Sciences,Nanjing 211135,China)

机构地区：[1]中国科学院南京天文光学技术研究所太阳与空间仪器研究室,南京210042 [2]中国科学院天文光学技术重点实验室,南京210042 [3]中国科学院大学,北京100049 [4]上海理工大学光电信息与计算机工程学院,上海200093 [5]中国科学院大学南京学院,南京211135

出　　处：《光子学报》2024年第4期1-10,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11973009,11933005);江苏省重点研发计划(No.BE2023080);中国科学院基金(No.KGFZD-145-23-04-03)。

摘　　要：激光频率梳定标的虚拟成像相位阵列光谱仪有潜力同时实现超高光谱分辨率与波长定标精度,对于天文光谱探测有重要意义。然而,现有的研究工作中,虚拟成像相位阵列光谱仪采用常规的双通道光纤输入模式,在受环境干扰时,两个通道的同步性较差,相对漂移严重,从而降低了光谱仪的重复性定标精度。为解决该问题,提出一种以光波导作为输入器件的双通道虚拟成像相位阵列光谱仪,利用波导通道之间相对稳定的特性,实现更高水平的同步定标精度。通过对不同环境下光谱仪的稳定性进行研究得出,在相似的测试条件下,波导输入的虚拟成像相位阵列光谱仪的重复性定标精度明显优于光纤输入时的定标表现。In the realm of observational astronomy,achieving high-precision spectral detection has become a crucial necessity,particularly for scientific endeavors such as studying terrestrial planets via radial velocity methods,probing cosmological variations in fundamental constants,and measuring the universe's expansion rate.This demand drives the advancement of spectrometers with high spectral resolution and high wavelength calibration accuracy.Over the past two decades,several high-resolution astronomical spectrometers tailored for high-precision radial velocity measurements have been developed worldwide.These spectrometers typically employ echelle gratings as the primary dispersion components,characterized by complex structures,large dimensions,stringent mechanical and thermal stability requirements,and considerable manufacturing and maintenance costs.Compared with the gratings,the Virtually Imaged Phased Array(VIPA),employing the side-entrance Fabry-Perot etalon geometry,features a simple and compact structure,ultra-high angular dispersion,minimal sensitivity to slit width variations,and ease of calibration when combined with laser frequency combs.These characteristics render it highly promising in astronomical spectrum detection.Consequently,research endeavors focused on VIPA spectrometers for astronomical applications have been initiated.A kind of VIPA spectrometer equipped with dual-channel optical fiber input and calibrated using a laser frequency comb was developed,and its long-term stability was investigated.However,significant relative shifts and poor synchronization of parallel optical fiber channels under environmental disturbances limit the calibration repeatability of this spectrometer.A substantial disparity persists between the dual-channel synchronous calibration accuracy and the photon noise limit.To mitigate the significant impact of relative shift between channels on synchronous calibration accuracy,this paper adopts a novel dual-channel optical waveguide input mode.Compared to the side-by-side optic

关 键 词：天文光谱探测 虚拟成像相位阵列 双通道光谱仪 光波导 同步定标 激光频率梳 

分 类 号：P141.5[天文地球—天体物理]