提出了一种基于棱镜-光栅-棱镜分光器件的短波红外成像光谱仪光学系统，该系统由离轴三反射式望远物镜、准直镜、棱镜-光栅-棱镜和会聚镜组成，光谱覆盖950~2 500 nm，空间视场达到22.5°.在实现宽视场、宽波段设计的同时，优化设计了棱镜-光栅-棱镜分光器件的各个参量.通过偏斜会聚镜光轴和棱镜-光栅-棱镜光轴在光谱维的角度，可以良好地校正色畸变keystone和谱线弯曲smile，将二者控制在5 μm以下，使得成像光谱仪获取的光谱信息更为准确.

An optical system for short wave infrared imaging spectrometer was proposed based on prism-grating-prism(PGP)component. The system is composed by off-axis TMA, collimator, PGP and re-imaging lens, and its response covers the range 950 to 2 500 nm with a 22.5°field of view. The system is able to achieve wide field and broadband. By optimizing the PGP paramters and tilting the reimaging lens along the spectral dimenstion, keystone and smile became slight and were even less than 5 micrometer. Thus the obtained spectral data were more exact.