Non-linear magneto-optical polarization rotation in dark and bright coherent states

Z. D. Grujić; M. M. Mijailović; A. J. Krmpot; B. M. Panić; D. V. Pantelić; B. M. Jelenković

doi:10.1117/12.726884

5 March 2007 Non-linear magneto-optical polarization rotation in dark and bright coherent states

Z. D. Grujić, M. M. Mijailović, A. J. Krmpot, B. M. Panić, D. V. Pantelić, B. M. Jelenković

Proceedings Volume 6604, 14th International School on Quantum Electronics: Laser Physics and Applications; 66040E (2007) https://doi.org/10.1117/12.726884
Event: 14th International School on Quantum Electronics: Laser Physics and Applications, 2006, Sunny Beach, Bulgaria

Abstract

We have measured non-linear Faraday effects for dark and bright long-lived Zeeman coherences in the D2 resonance line of ⁸⁵Rb, for linearly polarized input laser light. Zeeman coherence in the bright state show enhanced nonlinear effects, larger values for the angle of polarization rotation and higher rates of the polarization rotation, similar to recent results for higher refractive index and dispersion in the bright state of Cs ¹. Dark and bright states also show different dependence of both polarization rotation angle and of polarization rate on the laser intensity, while the resonance width for both states varies similarly with the laser intensity. We show small enhancement of such non-linear effects when the laser beam diameter increases from 1 mm to 5 mm. Ellipticity of transmitted laser beam vary strongly for amplitudes of the external magnetic field smaller then 50 mG, but the maximum value of the ellipticity remains below &pgr;/300.

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Z. D. Grujić, M. M. Mijailović, A. J. Krmpot, B. M. Panić, D. V. Pantelić, and B. M. Jelenković "Non-linear magneto-optical polarization rotation in dark and bright coherent states", Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66040E (5 March 2007); https://doi.org/10.1117/12.726884

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