MSDD1000 series monochromator-spectrograph serves for obtaining high spectral resolution with small size of the device, thus there are certain limitations when choosing gratings, connected with a specific optical schematic of this type of the device.
The MSDD1000 series is a double dispersion monochromator-spectrographs with the two-level arrangement of optical components to allow dispersion doubling.
In order to avoid downfall of two adjacent orders of the same decomposed in a spectrum wavelength from one grating to another, the spectral range of MSDD1000 series has limitations in a short-wave region for the gratings with low lines density.
The minimal operating wavelength values in nm for diffraction gratings with line density from 24 to 600 lines per mm are given in the table beside.
For gratings with high groove density, there is no limitation in a short-wave region.