激光术语中英文对照.pdf

光学在线：（光学及相关专业技术网站） 光电论坛：（中英光电专业技术讨论板） 光电资讯网：（光电产业及资讯服务网站） ） Laser Glossary ABLATION: The removal of material or tissue by melting, evaporation, or vaporization. ABSORB : To transform radiant energy into a different form, usually with a resultant rise in temperature. ABSORBANCE : The ability of a medium to absorb radiation depending on temperature and wavelength. Expressed as the negative common logarithm of the transmittance. ABSORPTION COEFFICIENT : The amount of radiant energy absorbed per unit or path-length. ACTIVE MEDIUM: A medium in which lasing will take place, rather than absorption, at a given wavelength. AFOCAL : Literally, “without a focal length”; an optical system with its object and image point at infinity. AMPLIFICATION: The growth of the radiation field in the laser resonator cavity. As the light wave bounces back and forth between the cavity mirrors, it is amp stimulated emission on each pass through the active medium. AMPLITUDE : The maximum value of the electromagnetic wave, measured from the mean to the extreme; put simply, the height of the wave. (See drawing under “POLARIZATION.”) ANGLE OF INCIDENCE : see “INCIDENT LIGHT .” ANGSTROM UNIT : A unit of measurement for a wavelength of light (written ?, equal to one ten billionth of a meter (10- 10 meter). Occasionally still used. ANODE : An electrical element in laser excitation which attracts electrons from a cathode. An anode can be cooled di rectly by water or by radiation. AR COATINGS: Anti-reflection coatings, used on the backs of laser output mirrors to suppress unwanted multiple reflections which reduce power. AUTOCOLLIMATOR: A single instrument combining the functions of a telescope and a collimator to detect small angular displacements of a mirror by means of its own c