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We investigate the effects of the electron-hole spin dynamics on thepolarization fluctuations in the light emitted from a vertical cavity surfaceemitting laser (VCSEL). The Langevin equations are derived based on a rateequation model including birefringence, dichroism, and two carrier densitypools seperately coupled to right and left circular polarization. The resultsshow that the carrier dynamics phase lock the polarization fluctuations to thelaser mode. This is clearly seen in the difference between fluctuations inellipticity and fluctuations in polarization direction. Seperate measurementsof the polarization fluctuations in ellipticity and in polarization directioncan therefore provide quantitative information on the non-linear contributionof the carrier dynamics to polarization stability in VCSELs.Comment: 6 pages RevTex and 3 figures, to be published in Quantum and  Semiclassical Optics, minor changes to the discussion of timescale

Polarization fluctuations in vertical-cavity surface-emitting lasers: a key to the mechanism behind polarization stability