====== Infrared light ======

Infrared (IR) light is a type of electromagnetic radiation that lies between the visible end of the light spectrum, and the microwave spectrum (Vollmer and Mollmann, 2010). Its wavelength ranges from about 800 nm to 1 mm and it is emitted particularly by heated objects.
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An Er: [[YAG laser]] ([[erbium]]-doped [[yttrium aluminium garnet]] [[laser]], [[erbium]] [[YAG laser]]) is a [[solid-state laser]] whose active laser medium is erbium-doped yttrium aluminium garnet (Er:Y3Al5O12). Er: YAG lasers typically emit [[light]] with a [[wavelength]] of 2940 nm, which is [[infrared light]].