LASER is light amplification by stimulated emission of radiation. Laser light is a manmade single-photon wavelength. The process occurs when an excited atom is stimulated to emit a photon. This is followed by subsequent release of another photon and so on. Stimulated emission generates, coherent (synchronous), monochromatic (single wave length), and collimated form of light LASER light when it reaches tissues gets reflected/ absorbed/scattered/transmitted to surrounding tissues. This is due to the presence of water, proteins, and pigments in biological tissues. This absorption coefficient of biological tissue strongly depends on the wavelength of LASER.

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Human immunodeficiency virus (