Design of visible-ultraviolet cylinder mirror imaging spectrometer

By adjusting the difference of spectrometer focal power in tangential plane and sagittal plane with cylinder mirror, the astigmatism of the spectrometer is corrected. The sphere aberration and the coma of Czerny-Turner spectrometer is also analyzed. The sphere aberration is controlled by the F number of the optical system. The coma is corrected by adjusting off-axis angles of the collimation mirror and the focus mirror. A prototype of wide band cylinder mirror imaging spectrometer is developed using imaging spectrometer tolerance analysis method based on Monto-Carlo simulation. The prototype works in 200-700 nm, and its aberrations are also corrected in such wide band. The spatial resolution in slit direction is 320 pixel. The focal length of the prototype f′=100 mm and its F number is 5.2. The spectral resolution in whole band is smaller than 2 nm.