高分辨率光谱仪与极大望远镜耦合问题分析  

Technique challenges in coupling of high resolution spectrograph with extremely large telescope

作　　者：张弛[1,2,3] 朱永田[1,2] 张凯[1,2] 

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,江苏南京210042 [2]中国科学院天文光学技术重点实验室,江苏南京210042 [3]中国科学院大学,北京100049

出　　处：《应用光学》2014年第5期868-872,共5页Journal of Applied Optics

基　　金：国家自然科学基金国际合作重大项目(10373015)

摘　　要：介绍国际上地面极大光学/红外望远镜的研制概况,分析高分辨率光谱仪与极大口径望远镜耦合中的难题,结果表明极大口径望远镜需要超大面积阶梯光栅和超快焦比相机。根据光谱仪与望远镜的匹配关系,30m级极大口径望远镜的高分辨率光谱仪的准直光束将大于70cm,主色散阶梯光栅的面积大于2m2,照相机的焦比F/0.5,按照目前的制造技术无法提供上述光栅和相机,因此,提出高分辨率光谱仪与极大望远镜进行耦合的技术。针对耦合问题给出了相应解决方案,即采用像切分器、拼接光栅以及白瞳设计等技术将是极大口径望远镜与高分辨率光谱仪耦合的主要解决方案。We reviewed the designing of several international ground-based extremely large optical/infrared telescopes and introduced the problems faced in the coupling of high resolution spectrograph with telescopes of extremely large aperture.It is proposed that large area of echelle and ultrafast focal ratio camera can serve as a solution.According to the coupling rule of the spectrogragh and the telescope,the diameter of collimated beam for a 30 mtelescope would be over 70 cm,and the size of the main dispersion echelle grating would be larger than 2m2.To build such huge and costly equipment would be difficult with current techniques.And large aperture camera with focal ratio F/0.5is also hard to design and manufacture.Image slicer,mosaic gratings and white pupil optic become major solutions in designing the high resolution spectrograph for an extremely large aperture telescope.

关 键 词：天文望远镜 高分辨率光谱仪 阶梯光栅 光谱 

分 类 号：TN205[电子电信—物理电子学] TH744.1[机械工程—光学工程]