用于高分辨率光谱仪的离轴三反射镜光学系统的设计

面对空间遥感，尤其在目标特性的精细化识别中，要求成像光谱仪具有高灵敏度、高光谱分辨率与高能量通过力等优点．在同轴三反射光学系统的基础上，采用视场离轴方式，设计了一个三镜无遮拦全反射光学系统．次镜和光阑重合，无中间像，实现了高分辨率、大视场、长焦距的要求．光学系统的基本参数为：焦距f’=1600mm，视场角为2w=18°×0．148°，相对孔径为1／10，3个反射面均为二次曲面．设计结果表明，成像质量接近衍射极限，用此方法设计的光学系统在航天遥感领域具有很好的应用前景．

Design of Uncoaxial Three-reflective Optical System Used in Imaging Spectrometer with High Spectrum Resolution

With regard to the remote sensing, especially the subtle discriminating of the target, the imaging spectrometer with high delicacy, high spectrum resolution and super throughput are required. Based on the coaxial three-reflective optical system, an off-axial three-reflective optical system with no obstructing between three mirrors was designed by means of field of view off-axis form. The aperture stop of the system was on the secondary mirror, and with no middle image the requirement of high resolution, wide field of view, long focal length was satisfied. The capital parameters of the optical system are f＇ = 1 600mm,2w= 18° × 0. 148° F/num- ber= F/10, and all surfaces are conicoid. The results indicate that the quality of imaging has arrived at the diffraction-limitation, and the optical system designed by this method has good application prospect on space sensing.