Velocity anisotropy effect in pump-probe spectra of cesium in a micrometric thickness optical cell

P. N. Ghosh; S. Mitra; B. Ray; A. Krasteva; D. Slavov; P. Todorov; S. Cartaleva

doi:10.1117/12.2178819

8 January 2015 Velocity anisotropy effect in pump-probe spectra of cesium in a micrometric thickness optical cell

P. N. Ghosh, S. Mitra, B. Ray, A. Krasteva, D. Slavov, P. Todorov, S. Cartaleva

Proceedings Volume 9447, 18th International School on Quantum Electronics: Laser Physics and Applications; 944703 (2015) https://doi.org/10.1117/12.2178819
Event: Eighteenth International School on Quantum Electronics: Laser Physics and Applications, 2014, Sozopol, Bulgaria

Abstract

The pump-probe spectra in a cell of micrometric thickness containing cesium vapor are reported. The line shape and nonlinear features observed in the case of fluorescence in the direction parallel to the cell windows and the transmission spectra observed along the propagation direction of the probe beam show considerable differences in the spectral profiles. We observed Electromagnetically Induced Transparency (EIT) and enhanced Velocity Selective Optical Pumping (VSOP) signals. Atoms moving nearly parallel to the windows and perpendicular to the collinear pump and probe beams will see much lower Doppler shift of incident frequencies and hence will lead to considerable narrowing of the Doppler background in the fluorescence spectra. The coherence decay rate is also low for such atoms as they do not meet with the cell walls. A theoretical model based on five level optical Bloch equations is used to simulate the spectra. The Doppler convolution includes all possible orientation of atomic velocities with respect to the laser beam direction. The simulated curves reproduce the observed sharp EIT peaks and enhanced broad VSOP signals for the closed probe transition in the fluorescence and absorption spectra. The observed effect of the light intensity and temperature change on the non-linear features is reproduced by the simulation.

Citation Download Citation

P. N. Ghosh, S. Mitra, B. Ray, A. Krasteva, D. Slavov, P. Todorov, and S. Cartaleva "Velocity anisotropy effect in pump-probe spectra of cesium in a micrometric thickness optical cell", Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 944703 (8 January 2015); https://doi.org/10.1117/12.2178819

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KEYWORDS

Absorption

Luminescence

Chemical species

Doppler effect

Cesium

Laser beam diagnostics

Optical pumping

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