Monochromator (from Greek monos – the only one, from Greek chroma – color).
A monochromator is a device that is capable of isolating a beam with a short wavelength interval from the electromagnetic radiation stream, which enters its optical device. In this device, the main elements dispersing and decomposing radiation into the spectrum are a prism or a diffraction grating. One of the integral parts of the monochromator is two narrow slits. Most often, they are no more than a millimeter wide and 1-2 centimeters long. The entrance slit cuts off a flat beam of incoming radiation that hits the dispersing element. A narrow section of the resulting spectrum, oriented parallel to the entrance slit, falls out. The narrower the spectral range of wavelengths the outgoing radiation beam has, the smaller the distance between the inlet and outlet openings.
Monochromator
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