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 mm	Blaze Wavelength	Type	Recommended Wavelength Range	Comments
2400	250nm	H	200nm – 675nm	Optimum resolution in UV
1800	250nm	H	200nm – 900nm	High resolution, low scatter in UV-VIS
1800	500nm	R	200nm – 900nm	High resolution, high efficiency in UV-VIS
1200	500nm	R	250nm – 1200nm	High efficiency in UV-VIS-NIR
1200	750nm	R	350nm – 1200nm	Night vision compatibility testing
830	1.2µm	R	500nm – 1.8µm	Optimum for 1.1µm to 1.8µm
600	1.6µm	R	0.8µm – 2.5µm	Fibre spectral loss
300	3.0µm	R	1.5µm – 5.5µm	General purpose IR
150	4.0µm	R	2.4µm – 8.0µm	Recommended 3µm to 5µm
100	9.0µm	R	4.5µm – 16.2µm	General purpose IR
75	12.0µm	R	6µm - 21µm	Recommended 8µm to 14µm
50	18.0µm	R	9µm - 27µm	General purpose IR
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

We suppliy 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.