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Laser Principle

  • Karl F. RenkEmail author
Chapter
Part of the Graduate Texts in Physics book series (GTP)

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 of the resonator represents the useful radiation.

Keywords

Active Medium Occupation Number Round Trip Gain Factor Lower Laser Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Institut für Angewandte PhysikUniversität RegensburgRegensburgGermany

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