摘要
分析了空间干涉光谱仪对空间分光特性的要求,即两干涉光束的光程差应该是某空间变量的线性函数,同时为了提高仪器的分辨率,最大光程差应该有尽可能大的值。为了得到满足上述条件的光学元件,对双折射棱镜中光波的传播特性进行了分析。并在不同的棱镜切割角条件下,当入射光束取不同入射点和不同入射角时,所形成的两光之间的光程差进行了计算机模拟,给出了相应的函数曲线。模拟结果表明在切割角不太大的条件下,光程差与入射点和入射角的关系具有较好的线性,只要相关的元件参数和空间变量选取的合适,也可以得到较大的最大光程差。
The demands of Fourier transform spectroscopy for properties of spatially split beams were discussed. That is, the optical path difference (opd) should be linear function of a spatial variable, and the maximum of opd should be as larger as possible in the sake of high resolving power. In order to get some optical elements which assure above mentioned demands, transmission characteristics of ordinary ray and extraordinary ray in Wollaston prism were analyzed in detail. The opd between o ray and e ray with different incident positions .T and different incident angles i were calculated accurately and completely under different cut - angles, and relative curves of opd were given. The results show that the opd versus x and i has nice linearity in the case of cut - angle being not too big, and larger maximum of opd could be gotten with suitable element parameters and spatial variables being used.
出处
《抚顺石油学院学报》
2003年第4期81-83,86,共4页
Journal of Fushun Petroleum Institute
关键词
应用光学
干涉光谱仪
光程差
双折射棱镜
Applied optics
Interferential spectroscopy
Optical path difference
Birefringence prism
