Heidelberg 1999 – scientific programme

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Q: Quantenoptik

Q 37: Poster: Quanteneffekte

Q 37.18: Poster

Thursday, March 18, 1999, 16:30–18:30, PH

Nonlinear and Magneto-Optical Processes in Cs Vapor in Conditions of Saturated Absorption and Optical Pumping — •A. V. Papoyan^1,2, R. G. Unanyan^1,2, and K. Bergmann¹ — ¹Fachbereich Physik der Universit"at Kaiserslautern, Postfach 3049, D-67653 Kaiserslautern — ²Institute for Physical Research of Armenian National Academy of Sicences, Ashtarak-2, 378410, Armenia

We present results on magneto-optical, polarization, and spectroscopic studies of dilute Cs vapor exposed to intense cw single-frequency laser radiation in the spectral region of atomic D₂ line. We report the observation of a sub-Doppler structure in the fluorescence and transmission spectra on the F=4 → F′= 3,4,5 and F=3 → F′=2,3,4 transitions (in the latter case only in the presence of a non-zero magnetic field). Numerous experimental evidences and calculations show that, under the conditions of our experiment, the structure is caused by an amplification of the F=4 ↔ F′=5 and F=3 ↔ F′=2 radiation due to local population inversion among the magnetic sublevels. Besides the coherent populationtrapping on F=3 ↔ F′=2 transition, we have observed anti-trapping on the F=4 ↔ F′=5 transition at zero-magnetic field with circularly and linearly (less pronounced) polarized laser radiation. In addition, an asymmetry with respect the direction of the magnetic field exhibit itself when the magnetic field is directed along the σ- polarized laser propagation. It is found that amplification due to inversion among the magnetic sublevels may occur for a weak magnetic field.