一种提高天文光谱仪光效率的有效方法

The Effective Method of Increasing Efficiency for Astronomical Spectrograph

本文指出改变光谱仪传统设计方法，加大准直镜口径使准直光束在光栅边缘略有溢出，在保证光谱分辨率不变的前提下，光效率显著提高，最高可达６％左右。

Abstract In this paper, one method to higher light efficiency is given for astron-mical spe ctrograph. It is different from conventional design. The collimated beam is largerthan grating size. The light efficiency increases with increasing collimator diameter at samespectral resolution. According to our calculations the increase in efficiency is 6%。 Advan-tages and disadvangtages are also noted.