Low stray light, excellent throughput and wide wavelength range highlight the features of Gamma Scientific's NM-3DH and 5DH monochromator systems. Each system uses an astigmatic holographic grating as the monochromatic selector.

With the addition of either a Gamma Scientific detector assembly or light source, these systems can be quickly configured to measure sources or detectors respectively. In either configuration they are computer controlled using our Model GS-4100A or GS-3100 intelligent radiometer and Light Touch software.

The NM-3DH and NM-5DH are identical except for optical specifications. Each includes an electric shutter for dark-current subtraction via computer control.

In both systems, careful optical design eliminates any optical element between slits except for the concave grating. There are no mirrors or lenses between slits. This approach minimizes scattered light in this, the most critical optical part of the monochromator.