Abstract
A laser (=laser oscillator) is a self-excited oscillator. A self-excited oscillator starts oscillation by itself and maintains an oscillation. Laser radiation is generated by stimulated transitions in an active medium. The active medium is a gain medium — propagation of radiation in the active medium results in an increase of the energy density of the radiation. The active medium in a laser experiences feedback from radiation stored in a laser resonator. A portion of radiation coupled out from the resonator represents the useful radiation.
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© 2012 Springer-Verlag Berlin Heidelberg
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Renk, K.F. (2012). Laser Principle. In: Basics of Laser Physics. Graduate Texts in Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23565-8_2
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DOI: https://doi.org/10.1007/978-3-642-23565-8_2
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Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-23564-1
Online ISBN: 978-3-642-23565-8
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