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Physical Review A

Self-rotation of resonant elliptically polarized light in collision-free rubidium vapor

Simon Rochester, D. S. Hsiung, Dmitry Budker, R. Y. Chiao, Derek F. Jackson Kimball, Valeriy V. Yashchuk

Published Mar 15, 2001• 85 citations
Publisher

Abstract

Self-rotation (SR) of elliptically polarized light resonant with atoms in a collision-free vapor is investigated experimentally and theoretically. Results of density matrix calculations are compared to measurements of SR on the Rb $D1$ and $D2$ lines. It is noted that SR effects involving individual hyperfine transitions are suppressed due to Doppler broadening, and so previously unrecognized effects arising from the interaction of light with multiple hyperfine transitions can become dominant.

DOI
10.1103/physreva.63.043814

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Self-rotation (SR) of elliptically polarized light resonant with atoms in a collision-free vapor is investigated experimentally and theoretically. Results of density matrix calculations are compared to measurements of SR on the Rb D1D1D1 and D2D2D2 lines. It is noted that SR effects involving individual hyperfine transitions are suppressed due to Doppler broadening, and so previously unrecognized effects arising from the interaction of light with multiple hyperfine transitions can become dominant.
We present an experimental and theoretical study of self-rotation of optical polarization in a rubidium vapor.The atomic vapor is placed in a magnetic shielding cavity to suppress the Faraday rotation effect.In our experiment, Doppler-free spectroscopy configuration is used, and F = 2 → F = 3 transition of 87 Rb D2 line is chosen.We observe self-rotation of optical polarization effect at different pump light ellipticities.A theoretical analysis is then provided based on the experimental conditions.Theoretical simulation and experimental results are in good agreement.
Summary form only given. Self-rotation (SR) of the polarization ellipse upon propagation through a nonlinear medium was among the first nonlinear optics phenomena observed. SR in resonant atomic vapors has been the subject of several theoretical and experimental studies. We describe SR in two-level F/spl rarr/F' systems (F, F' are the total angular momenta of the lower and the upper state) and present experiments and theoretical interpretation (based on density matrix calculations) of SR on the Rb D/sub 1,2/ lines.
We theoretically and experimentally study the effects of Faraday rotation, optical polarization of self-rotation, and their overlapping rotation. In our theoretical simulation, we set up a simple and effective theoretical model for the three kinds of rotations. In our experiment, the atomic vapor is placed in a magnetic shielding cavity to shield the earth magnetic field. Doppler-free spectrum configuration is used and the F=2 F'=3 transition of 87Rb D2 line is chosen. We observe the three kinds of rotations, separately. Experimental results and theoretical simulations are in good agreement.
The Faraday rotation and ellipticity spectra of rubidium $5{P}_{3/2}\ensuremath{\rightarrow}4{D}_{5/2}$ transition in a magnetic field have been calculated and experimentally measured. By using the rotating quarter-wave plate method, the Stokes parameters of the $5{P}_{3/2}\ensuremath{\rightarrow}4{D}_{5/2}$ near-resonant probe light are measured to obtain the Faraday rotation and the ellipticity. The variation of the rotation and the ellipticity spectra is analyzed in different magnetic fields, temperatures, and pump powers. The polarization rotation over 50 deg in 1529 nm with negligible elliptical distortion is obtained. Our study of the Faraday effect between excited states of atoms broadens the available wavelength of the Faraday effect in applications.
Abstract Various efforts have been made to overcome Doppler broadening in hyperfine measurement limitations in the atomic vapors spectroscopy and associated applications. The present study measured and calculated hyperfine resolved ellipsometric parameters through the near-normal reflectance spectra of the rubidium vapor cell in two experimental setups based on continuous and modulated pathway. The results indicated that valuable information could be extracted from the ellipsometric parameters about the atomic medium. Change in the ellipsometric parameters in each transition line confirms the existence of the elliptical polarization of the reflected light when it is exposed to the alkali metal vapor. Our results show that the ellipticity at 5S1/2 (Fg = 1, 2) → 5P1/2 (Fe = 1, 2) hyperfine transitions of 87Rb (D1 line) is small, and accordingly hyperfine transitions between the ground 5S1/2 (Fg = 2, 3) and excited 5P1/2 (Fe = 2, 3) states of the 85Rb isotope are considerable. These ellipsometric parameters, as phase difference, can trace the behavior of the relative orientation of the electric field and atom velocity in the interface based on van der Waals dipole–dipole interaction and is directly proportional to the strength of the light-matter interaction which extremely useful instead complicated atomic spectroscopic methods.