Theory of lasing resonators: quality factor and line width

Markus Pollnau, M. Hammer (Editor), M. Eichhorn

    Research output: Contribution to conferenceAbstractOther research output

    Abstract

    This paper defines the quality factor of a continuous-wave laser and relates it to the laser line width. By systematically including spontaneous emission into the calculation, we show that the Q-factor of a lasing resonator is finite, because the gain becomes smaller than the losses and, consequently, any coherent state inside the laser resonator decays with half the coherence time of the emitted laser light. The Schawlow-Townes line width of a laser is then straight-forwardly derived.
    Original languageUndefined
    PagesPaper O-2.1
    Number of pages1
    Publication statusPublished - Apr 2013
    Event21st International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling, OWTNM 2013 - University of Twente, Enschede, Netherlands
    Duration: 19 Apr 201320 Apr 2013
    Conference number: 21
    https://www.owtnm-workshop.org/

    Conference

    Conference21st International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling, OWTNM 2013
    Abbreviated titleOWTNM
    CountryNetherlands
    CityEnschede
    Period19/04/1320/04/13
    Internet address

    Keywords

    • METIS-295732
    • EWI-23311
    • IOMS-APD: Active Photonic Devices
    • IR-85837

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