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The spin-fluctuations-related Kerr rotation noise of the optical beamreflected from a microcavity with a quantum well in the intermirror gap isstudied. In the regime of anti-crossing of the cavity polariton branches, theseveral hundred times enhancement of the noise signal, or giant noise, isobserved. The effect of the amplification of the noise signal is explained bythe nonlinear instability of the microcavity. In the frame of the developedmodel of built-in amplifier, the non-trivial properties of the noise signal inthe regime of the negative detuning of microcavity are described.

Noise spectroscopy of the optical microcavity: nonlinear amplification of the spin noise signal and giant noise