Most types of laser are an inherently pure source of light they emit near- monochromatic light with a very well defined range of wavelengths. The principles of laser spectroscopy are discussed by Demtröder. Lasers may also be indirectly used in spectroscopy as a micro-sampling system, a technique termed Laser ablation (LA), which is typically applied to ICP-MS apparatus resulting in the powerful LA-ICP-MS. In astronomy, lasers have been used to create artificial laser guide stars, used as reference objects for adaptive optics telescopes.Lasers have been used aboard spacecraft such as in the Cassini-Huygens mission.Laser based lidar (LIght raDAR) technology has application in geology, seismology, remote sensing and atmospheric physics.Holographic techniques employing lasers also contribute to a number of measurement techniques.Investigating nonlinear optics phenomena.A wide variety of interferometric techniques.In science, lasers are used in many ways, including:
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