Diffraction grating monochromator

June 30, 2013
USAGE EXAMPLES

TMc150
150mm focal length monochromator with dual grating turret

DMc150
300mm focal length compact double monochromator

TMc300
300mm focal length monochromator with triple grating turret

DTMc300
600mm focal length double monochromator with triple grating turret

TMS300
300mm focal length monochromator with internal motorised slits and triple grating turret

DTMS300
600mm focal length double monochromator with internal motorised slits and triple grating turrets

TMS305
300mm focal length high throughput monochromator with internal motorised slits and triple grating turret

M300
300mm focal length monochromator, manual/external drive, single grating

Bentham manufacture a range of monochromators with associated accessories to cover a very considerable range of measurements.

In selecting the most appropriate monochromator model and accessories for a given application, the following 3 principal (but by no means sole) considerations should broadly be taken into account :

  • spectral range of operation
  • required spectral resolution
  • consideration of the application with regards to stray light performance of the monochromator

Several models are available as spectroradiometers, with integrated detection electronics, to provide a complete measurement solution.

Spectral Range

Diffraction gratings are specified by a line density in grooves per millimetre. The higher the density, the greater light is dispersed resulting in a relatively limited spectral extent. Furthermore, in general, the higher line density gratings are optimised for short wavelength use and vice versa. One must take into account the available grating(s) and the operation range of such before deciding how many gratings are required to cover a given range. Where multiple gratings are required, one can opt for a multiple-grating monochromator which would allow performing a spectral measurement over a great range, or whether a single (interchangeable) grating monochromator is used and the measurement performed in two or more parts.

For measurements performed over a very wide spectral range, interchangeable turrets can be purchased for multiple grating monochromators.

See also:
Source: www.bentham.co.uk
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