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Glossary:LAS
There is a range of methods called laser absorption spectroscopy, where laser light is used to precisely measure absorption features of substances. The purpose of such kinds of spectroscopy is frequently to find out details on such substances, but in other cases one utilizes known details of substances for other purposes. For example, laser absorption spectroscopy is often used for realizing optical frequency standards, e.g. by stabilizing the wavelengths of a laser to a precisely defined absorption transition.[1]