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Measurement of Diffraction Grating Efficiency

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Measurement of Diffraction Grating Efficiency

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Grating efficiency measurements are generally performed with a double monochromator system. The first monochromator supplies monochromatic light derived from a tungsten lamp, mercury arc, or deuterium lamp, depending on the spectral region involved. The grating being tested serves as the dispersing element in the second monochromator. In the normal mode of operation, the output is compared with that from a high-grade mirror coated with the same material as the grating. The efficiency of the grating relative to that of the mirror is reported (relative efficiency), although absolute efficiency values can also be obtained (either by direct measurement or through knowledge of the variation of mirror reflectance with wavelength).

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