MS750 series Monochromator-spectrograph, perfect imaging

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Monochromator-spectrograph MS750 series are devices with with a large flat focal field, combined with a high-intensity, accuracy and spectral resolution. They are completely automated spectral devices with focal length of 750 mm and F-number of 1/8.9, which can be used both as monochromators and spectrographs.

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).


M750 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 MS7501i and model MS7504i have the astigmatism-corrected optics what makes these devices applicable in multi-channel spectroscopy.

Automated four-grating turret (model MS7504 and model MS7504i) provides a fast switching of gratings with high repeatability of the set wavelength and the vertical image.


In MS7501 and MS7501i models a single-position holder is used for easy manual switching of gratings.

A wide choice of changeable gratings gives the best combination of high energetic efficiency and maximal spectral resolution for different spectrum areas.


Monochromators–spectrographs of MS750 series have one input port and two output ports. Selection of an output port is realized with an automated mirror. Either output spectral slits or multi-channel detectors can be installed on each of the output ports.

Extremely high spectral resolution – better than 0.02 nm for grating 1200 grooves/mm,makeS monochromators-spectrographs of MS750 series ideal devices for high resolution spectroscopy: Raman spectroscopy, laser-induced breakdown spectroscopy and also for multi-channel spectroscopy – models MS7501i and MS7504i, which provides extremely high spatial resolution along the slit heigh.



3MS7501 site

MS benefits


SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. fig2 MS 7501 optical shem


SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. fig3 MS 7504 optical shem


SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. book-2

Theory & Instructions
1. Spectral Instrument. Basic Concepts and Characteristics.
2. Spectral Devices. A Spectral Device Selection.
3. Spectra Detection. Detector Selection.


 Monochromator-spectrograph MS750 series, models

  MS7501 MS7501i MS7504 MS7504i
Diffraction unit Single-position holder for manually changeable gratings Single-position holder for manually changeable gratings Four–grating turret Four–grating turret
Optics  Standard Imaging Standard Imaging


In the devices with the standard optics (model MS7501 and model MS7504) a flat entrance deflecting mirror is used, and in the astigmatism–compensated devices (model MS7501i and model MS7504i) a cylindrical mirror is used as an entrance deflecting.

As well as in all Czerny–Turner design spectral devices, in the MS750 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 MS7504 and MS7504i the gratings rotation axes are arranged perpendicular to the spectrum scanning axis, providing a high repeatability of wavelength setting at replacing of gratings.