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The traversal of an elliptically polarized optical field through a thermalvapour cell can give rise to a rotation of its polarization axis. This process,known as polarization self-rotation (PSR), has been suggested as a mechanismfor producing squeezed light at atomic transition wavelengths. In this paper,we show results of the characterization of PSR in isotopically enhancedRubidium-87 cells, performed in two independent laboratories. We observed that,contrary to earlier work, the presence of atomic noise in the thermal vapouroverwhelms the observation of squeezing. We present a theory that containsatomic noise terms and show that a null result in squeezing is consistent withthis theory.Comment: 10 pages, 11 figures, submitted to PRA. Please email author for a PDF  file if the article does not appear properl

Effect of atomic noise on optical squeezing via polarization self-rotation in a thermal vapor cell