Optical cavity with absorptive medium and output coupling

The normal modes of a one-dimensional optical cavity having an absorptive medium plus output coupling are investigated. It is shown that these two line-broadening mechanisms lead to a set of collective modes, each one having a Lorentzian line shape whose linewidth is not simply a sum of the contributions of absorption and outcoupling. The application of these collective modes in a laser theory using this lossy cavity is mentioned.<
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