声光可调谐滤波器成像光谱仪光学系统设计

为了获得工作谱段范围在400～900 nm声光可调谐滤波器(AOTF)的成像光谱仪系统的二维空间信息、一维光谱及偏振信息，设计了一种应用于AOTF成像光谱仪的光学系统。介绍了AOTF的工作原理，根据AOTF光谱成像仪总体方案，对光学系统的物镜、准直镜及成像镜进行了合理的光学参数分配。设计中采用CODE-V光学设计软件模拟AOTF的多级衍射，在晶体中心即孔径光阑共轭的位置处设置了一块透射式光栅来模拟晶体的偏转，成像镜同时收集由AOTF产生的正交偏振的正、负一级衍射图像，整个系统采用了3种光学玻璃，最终完成了一个设计质量在32 lp/mm的空间频率下，调制传递函数(MTF)均值为0.75的光学系统。

Abstract

In order to acquire space, spectrum, and polarization information, the optical system which is applied to acousto-optic tunable filter(AOTF) imaging spectrometer is designed. The work principle of AOTF is described, then on the basis of instrument and system considerations, the optical parameters of the telescope and collimating optics are distributed reasonably. The optical design software CODE-V is used for the design, optimization and analysis of the optical system, and a refractive grating halfway along the crystal is used to simulate the effects of the AOTF. The +1 and -1 orthogonally polarized orders are produced by the AOTF at the same time. The whole system is achromatized from 400～900 nm using only three types of glass and imaging resolution excelled 32 lp/mm when the modulation transfer function (MTF) reaches 0.75.

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