Research of resolution for Offner two-mirror three-reflection imaging spectrometer

The calculating equation of spectral resolution was deduced by geometry method based on eliminating aberration structure of Offner two-mirror three-reflection imaging spectrometer.The entrance slit width,convex grating resolution,system aberration and pixel size of detector have a great influence on spectral resolution,and the influence of resolution for each parameter was analyzed.The calculating method and optimization design method of aberration were proposed in spectroscopic system.The techniques and methods of improving spectral resolution were summarized,namely,when the system aberration was optimized,the spectral resolution could be enhanced by decreasing entrance slit width and pixel size of detector.This system used optimization design of eliminating aberration,as well as design method of spectral resolution,which has important practical value.It can provide the experience and reference for imaging spectrometer′s designing.