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Scattered Light and Stray Light in Diffraction Grating

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Scattered Light and Stray Light in Diffraction Grating

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An annoying characteristic of all optical surfaces is their ability to scatter light. This undesirable light is often referred to as stray radiant energy (SRE). When this light reaches the detector of an instrument designed to measure an optical signal, the SRE contributes to the noise of the system. This Technical Note examines the causes of unwanted light from gratings and in spectrometers and describes how these forms of unwanted light are measured.The terminology of SRE is not standard, so for clarity we refer to unwanted light from the surface of the grating itself as scattered light, and unwanted light reaching the detector of a grating-based instrument as stray light.

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