MS520 series Monochromator-spectrograph, perfect imaging
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Monochromator-spectrograph MS520 series, models
In the devices with the standard optics (model MS5201 and model MS5204) a flat entrance deflecting mirror is used, and in the astigmatism–compensated devices (model MS5201i and model MS5204i) a cylindrical mirror is used as an entrance deflecting. As well as in all Czerny–Turner design spectral devices, in the MS520 series an axis of the diffraction gratings rotation goes through the center of grating operating surface and coincides with the direction of grooves. This fact provides the stability of the geometry of the beams for formation of a flat and fixed focal field. The image quality in the whole flat focal field is optimized due to the use of an asymmetric scheme and use of a focusing large-size mirror allows one to use the whole focal field width without vignetting. Besides, Cherny–Turner asymmetric scheme provides a low level stray light and light re-entrance from the optical elements and detectors can be avoided.
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