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We intend to provide general information about monochromators, spectrometers, spectrographs, their uses and applications. We hope it is useful.

A monochromator is an optical instrument that transmits a mechanically selectable discrete band of wavelengths of light, or other electromagnetic radiation, chosen from a wider range of wavelengths available at the input. The name is from the Greek roots mono-, "single,” and chroma, "color", and the Latin suffix -ator, denoting an agent.

as seen in Photonics Buyers Guide