Polarization rotation with electromagnetically induced transparency in a V-type configuration of Rb D1 and D2 transitions

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Abstract

Polarization rotation in electromagnetically induced transparency (PREIT) in rubidium vapour at room temperature has been studied experimentally as well as theoretically in the absence of any magnetic field. PREIT is observed for both 85Rb and 87Rb combining the D1 and the D2 transitions with a V-type configuration. For 85Rb, two EIT peaks and for 87Rb, one EIT peak were observed. Nonlinear characteristics of the variations of the angle of rotation corresponding to the EIT position were observed for both the isotopes of Rb. We have modelled a four level system to explain the occurrence of the double EIT in case of the 85Rb and the occurrence of one EIT peak for 87Rb. The rotation of plane of polarization of the probe beam can be further explained with this model. The characteristic behaviour of the variation of rotation corresponding to the EIT position from theoretical analysis has matched well with the experimental observations. A sharp rotation with a high signal to noise ratio in the vicinity of the EIT can be used as a modulation free and noise insensitive signal for the frequency stabilization.

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Das, A., Das, B. C., Bhattacharyya, D., Chakrabarti, S., & De, S. (2018). Polarization rotation with electromagnetically induced transparency in a V-type configuration of Rb D1 and D2 transitions. Journal of Physics B: Atomic, Molecular and Optical Physics, 51(17). https://doi.org/10.1088/1361-6455/aad6d5

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