Bentham offers around 200 types of diffraction gratings. The following table lists the most popular types likely to suit the majority of applications.


Grooves per
Type Recommended
2400 (view) 250nm H 200nm – 675nm Optimum resolution in UV
1800 (view) 250nm H 200nm – 900nm High resolution, low scatter in UV-VIS
1800 (view) 500nm R 200nm – 900nm High resolution, high efficiency in UV-VIS
1200 (view) 500nm R 250nm – 1200nm High efficiency in UV-VIS-NIR
1200 (view) 750nm R 350nm - 1200nm Night vision compatibility testing
830 (view) 1.2µm R 500nm – 1.8µm Optimum for 1.1µm to 1.8µ
600 (view) 1.6µm R 0.8µm – 2.5µm Fibre spectral loss
300 (view) 3.0µm R 1.5µm – 5.5µm General purpose IR
150 (view) 4.0µm R 2.4µm – 8.0µm Recommended 3µm to 5µm
100 (view) 9.0µm R 4.5µm – 16.2µm General purpose IR
75 (view) 12.0µm R 6µm –21µm Recommended 8µm to 14µm
50 (view) 18.0µm R 9µm –27µm General purpose IR
Gratings for Array Detectors
150 - H 540nm Spectral range with 25mm array
300 - H 270nm Spectral range with 25mm array
600 - H 135nm Spectral range with 25mm array

Gratings for single, double and triple monochromators

Bentham supplies mounted diffraction gratings for use in all of our monochromators.
The standard range is listed above, but almost 200 types are available from our non-standard range. Please contact us with your particular requirements.

All gratings for M300/DMc150 monochromators are supplied on kinematic mounts which allow adjustment in three degrees of freedom. Once set up for a particular monochromator, the gratings can be removed and replaced without loss of calibration. A screw-on protective cover is supplied so that gratings not in use can be stored without damage or accumulation of dust. The gratings in the triple grating turret monochromators TMc300 and TM600 are supplied pre-aligned.
Key to Bentham grating part numbers:

eg. Grating no. G312R0U5 reads as follows:

G3 12 R 0U5
denotes monochromator type:

G3 = M300

G15 = DMc150, TMc150

T3 = TMc300

T6 = TM600

Ruling density (grooves/mm)/100

Leading 0 = <1000g/mm

Leading 00 = <100g/mm


R = Ruled

H = Holographic

Blaze wavelength in micrometers,
using U as decimal point, e.g.0U5=0.5µm