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Recently reported optical nuclear orientation in the $n$-doped GaAsmicrocavity under pumping in nominal transparency region of the crystal [Appl.Phys. Lett. $\mathbf{106}$, 242405 (2015)] has arisen a number of questions,the main of them concerning mechanisms of angular momentum transfer from thelight to the nuclear spin system and the nature of the light-related magneticfields accompanying the optical nuclear polarization. In this paper, we use thespin noise spectroscopy for magnetometric purposes, particularly, to studyeffective fields acting upon electron spin system of an $n$-GaAs layer inside ahigh-Q microcavity in the presence of elliptically polarized probe beam. Inaddition to the external magnetic field applied to the sample in the Voigtgeometry and the Overhauser field created by optically oriented nuclei, thespin noise spectrum reveals an additional effective, "optical," magnetic fieldproduced by elliptically polarized probe itself. This field is directed alongthe light propagation axis, with its sign being determined by the sign of theprobe helicity and its magnitude depending on degree of circular polarizationand intensity of the probe beam. We analyze properties of this optical magneticfield and suggest that it results from the optical Stark effect in the field ofthe elliptically polarized electromagnetic wave.

Spin-noise-based magnetometry of an $n$-doped GaAs microcavity in the field of elliptically polarized light