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Quantum Electronics and Laser Science Conference

Coherent and population contributions in the photo-induced Faraday rotation

Robert Frey, C. Buss, S. Hugonnard-Bruyère, J. Frey, Christos Flytzanis

Published May 22, 1995• 0 citations
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We present a simple quantitative description of the lowest-order nonlinear Faraday effect of an atomic vapor by modeling the effect as a Hanle-type precession of the quadrupole moment induced by optical pumping. This gives the medium the symmetry of uniaxial birefringence, and the Faraday rotation is expressed in terms of this birefringence. We obtain expressions for transitions between states of arbitrary angular momenta; the new expressions match results obtained earlier for the case of depopulation pumping. The novel aspects are that only level populations intervene and that no explicit use of sublevel coherences is made. We present experimental verifications of the equivalence of light-induced birefringence and the nonlinear Faraday effect.

Journal of the Optical Society of America B•Apr 1, 1993•56 citations
Calibrating the strength of the light-matter interaction is an important experimental task in quantum information and quantum state engineering protocols. The strength of the off-resonant light-matter interaction in multi-atom spin oscillators can be characterized by the readout rate ΓS. Here we introduce the method named Coherently Induced FAraday Rotation (CIFAR) for determining the readout rate. The method is suited for both continuous and pulsed readout of the spin oscillator, relying only on applying a known polarization modulation to the probe laser beam and detecting a known optical polarization component. Importantly, the method does not require changes to the optical and magnetic fields performing the state preparation and probing. The CIFAR signal is also independent of the probe beam photo-detection quantum efficiency, and allows direct extraction of other parameters of the interaction, such as the tensor coupling ζS, and the damping rate γS. We verify this method in the continuous wave regime, probing a strongly coupled spin oscillator prepared in a warm cesium atomic vapour.
We present a simple quantitative description of the lowest-order nonlinear Faraday effect of an atomic vapor by modeling the effect as a Hanle-type precession of the quadrupole moment induced by optical pumping. This gives the medium the symmetry of uniaxial birefringence, and the Faraday rotation is expressed in terms of this birefringence. We obtain expressions for transitions between states of arbitrary angular momenta; the new expressions match results obtained earlier for the case of depopulation pumping. The novel aspects are that only level populations intervene and that no explicit use of sublevel coherences is made. We present experimental verifications of the equivalence of light-induced birefringence and the nonlinear Faraday effect.