Diffraction gratings

IMAGING monochromator-spectrographs of MSDD1000 series

MSDD1000 is a double dispersion monochromator-spectrograph with the effective focal length of 1 meter. Double scheme combines a high spectral resolution which is peculiar to long-focus instruments, extremely low stray light being the advantage of double schemes, and small sizes of single monochromator-spectrographs.

MSDD1000 is a completely automated spectral device with the focal length of 1000 mm (2х500 mm) and F\number of 1/5.9, which is applicable as both, a monochromator and a spectrograph, with a large flat field.

The MSDD1000 series is designed on the modified Cherny-Turner scheme with the two-level arrangement of optical components.

This is a double dispersion monochromator with no intermediate slit, in which upper and lower levels are the separate monochromators. These two levels are connected by means of two plane turning mirrors.

The design of the optical scheme and construction of the MSDD1000 series allows the monochromator of any level to be applied as the first one. Thus, if radiation is delivered to the entry of monochromator of one of the levels, the spectrum is formed in the flat field of the monochromator of another level, providing easy cascade of monochromators for construction of quadruple monochromator from two double ones.

High-quality optics and a wide choice of diffraction gratings provide operation of the MSDD1000 series monochromator-spectrograph in a wide spectral range from 185 nm up to 60 µm (depending on the selected grating) with the best spectral resolution.

In MSDD1002i and MSDD1004i models the astigmatism is corrected owing to special optics what makes these instruments applicable in multi-channel spectroscopy. ONLY one input port is used in these instruments.

MSDD1000 series monochromator-spectrograph has two input (only the models with no astigmatism compensation – MSDD1002 and MSDD1004) ports and two output ports. Selection of the output ports is realized with flip mirrors. Either exit spectral slits or multi-channel detectors can be established in each of the output ports.

MSDD1000 has two types of entrance and exit spectral slits: manual, operated with a micrometer screw, and automated (combined) when the slit width is operated automatically or manually (with micrometer).

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

We also propose a great choice of additional accessories for MSDD1000 series monochromator-spectrographs: filter wheel (6 and 8 filters), fast shutters with the opportunity of radiation direct delivery or via optical fiber, optical fibers with adapters, input and output condensers, integral and multi-element detectors and etc.

Extremely high spatial resolution – better than 0,004 nm for 3600 l/mm grating – in combination with high throughput (F/number is 1/5.9) makes double dispersion monochromator-spectrographs of the MSDD1000 series the ideal instruments for spectroscopy applications requiring high resolution in the limited area, where other spectral devices cannot be physically applied.

Benefits of MS series monochromator-spectrographs
Двойной IMAGING монохроматор-спектрограф MSDD1000
Оптическая схема MSDD1004 и MSDD1004i: автоматизированная турель
Automated turret for mounting of two pairs of gratings (in models MSDD1004 and MSDD1004i) provides fast switching of gratings with high repeatability of the set wavelength.
Оптическая схема MSDD1002 и MSDD1002i: однопозиционный держатель
In MSDD1002 and MSDD1002i device models a fixed holder is used for easy manual switching of diffraction gratings.

Models of monochromator-spectrographs of MSDD1000 series

Diffraction unitFixed holder for manually changeable diffraction gratingsFixed holder for manually changeable diffraction gratingsTurret for two pairs of gratingsTurret for two pairs of gratings
OpticsStandardAstigmatism-compensated (Imaging)StandardAstigmatism-compensated (Imaging)
  • Model MSDD1002:
    diffraction unit = fixed holder for manually changeable gratings; optics = standard.
  • Model MSDD1002i:
    diffraction unit = fixed holder for manually changeable gratings; optics = astigmatism-compensated (Imaging).
  • Model MSDD1004:
    diffraction unit = turret for two pairs of gratings; optics = standard.
  • Model MSDD1004i:
    diffraction unit = turret for two pairs of gratings; optics = astigmatism-compensated (Imaging).

As well as in all Cherny-Turner scheme-based spectral instruments, in MSDD1000 series monochromator-spectrographs an 00′ axis of the diffraction gratings rotation goes through the center of grating operating surface and coincides with the direction of lines. This fact provides the stability of the geometry of the beams for formation of a plane and fixed flat field. In the instrument with an automated turret, gratings rotation axes M-M1 and N-N1 are arranged perpendicular to the spectrum scanning axis, providing a high repeatability of wavelength setting at replacing of gratings.

SOL instruments methodical materials: