TMc300 Triple Grating Monochromator

The TMc300 single monochromator remains one of our most popular, thanks to its flexibility of configuration and its ability to cover a wide spectral range in a single scan.

Compatible with the full range of sources, detectors and accessories of the Bentham portfolio, the TMc300 monochromator is at the heart of many of our light measurement solutions throughout the UV, visible and IR.

Key features include:


Configuration Czerny-Turner symmetrical
Focal length 300mm
Grating mount Triple grating turret
Number of gratings 1-3
Grating size 68 x 84 mm
Aperture ratio f/4.1 (at all grating angles)
Number of entrance/exit ports 1/2 or 2/1
Mechanical resolution grating drive 0.000072°/ step
Slit type Fixed, micrometer or motorised variable
Slit width & height 10µm-8mm (W) x 20mm (H)
Filter size 25mm diameter
OPTICAL PERFORMANCE (quoted for 1200g/mm gratings)
Spectral range Within range 200nm-50µm
Linear dispersion 2.7nm/mm
Wavelength accuracy ± 0.2nm
Wavelength reproducibility ± 0.05nm
Resolution full/ reduced slit height 0.3/0.1nm
Stray light rejection at 2.5x FWHM 10-5
Wavelength acquisition speed 1000nm/s
Computer interface USB
Software control BenWin+ / SDK
Overall dimensions 316w x 354d x 209h mm
Optical height 178mm
Weight 14 kg
Power supply Mains input 110/220V 50/60Hz
Diffraction gratings See separate Gratings page
Order sorting filters See separate Order Sorting Filters page
Filter wheel 252-6 (6-position filter wheel, includes shutter)


ATMc300 configuration AA with SAM TMc300 configuration A with swing away mirror

BTMc300 configuration B C TMc300 configuration C

C with SAMTMc300 configuration C with swing away mirror DTMc300 configuration D

Dimensions - side view

TMc300 dimensions side view

Dimensions -top view

TMc300 dimensions top view