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MS350 Series monochromators–spectrographs a general-purpose instruments which can be used as monochromators or spectrographs with a large flat focal field. They are completely automated spectral devices with focal length of 350 mm and F-number of 1/3.8. High-quality optics and wide choice of diffraction gratings provide devices operation in a wide range from 185 nm up to 60 µm (depending on the selected grating). M350 Series monochromator-spectrographs are based on Cherny–Turner asymmetric scheme that allows to minimize of aberrations and exclude spectra re-entrance from diffraction gratings and mirrors. Model MS3501i and model MS3504i have the astigmatism-corrected optics what makes these devices applicable in multi-channel spectroscopy. Automated four-grating turret (model MS3504 and model MS3504i) provides a fast switching of gratings with high repeatability of the set wavelength and the vertical image.
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Models of monochromators–spectrographs of MS350 series
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MS3501 MS3501i MS3504 MS3504i Diffraction unit Single-position holder for manually changeable gratings Single-position holder for manually changeable gratings Four–grating turret Four–grating turret Optics Standard Astigmatism–compensated (Imaging) Standard Astigmatism–compensated (Imaging) In the devices with the standard optics (model MS3501 and model MS3504) a flat entrance deflecting mirror is used, and in the astigmatism–compensated devices (model MS3501i and model MS3504i) a cylindrical mirror is used as an entrance deflecting.
As well as in all Czerny–Turner design spectral devices, in the MS350 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.
In MS3504 and MS3504i the gratings rotation axes are arranged perpendicular to the spectrum scanning axis, providing a high repeatability of wavelength setting at replacing of gratings.