The frequency dependence of the Fabry-Perot cavity response to the weak modulation of the birefringence of an intracavity element is analyzed. It is shown that the polarization modulation of light at the exit of the cavity reveals resonant features at frequencies multiple of the intermode beat frequency of the cavity. The possibilities of applying this effect for the selective amplification of high-frequency oscillation of the medium anisotropy are considered. The prospects for creating spectrometers of HF birefringence with the cavity-enhanced amplification of the signal are discussed and a scheme of the all-optical spin noise spectrometer is proposed.
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