Abstract
We present in this paper a basic analysis of the physical mechanism underlying the internal frequency modulation of a laser oscillator which is caused by a variation of the optical path length of its Fabry-Perot resonator. It is shown how adiabatic variations of the optical resonator length are continuously converted into frequency variations of the electromagnetic field energy trapped between the resonator mirrors by a rapid succession of small Doppler shifts, thus complying with the general principle of adiabatic invariance in oscillatory systems.
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