The radiation source is an illuminating source of light source that can radiate a large amount of ultraviolet spectrum (1 to 380 nm) and infrared spectrum (780 to 1 × 106 nm) for illumination purposes. It includes ultraviolet light source, infrared light source and non-illumination. Visible light source. The above two types of light sources are all incoherent light sources. In addition, there is a kind of coherent light source, which emits light under the action of excited radiation by excited state particles, and the output light wave wavelength is from short-wave ultraviolet to far-infrared. This kind of light source is called laser light source.
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