Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Preparation of maximal atomic coherence in space by fractional stimulated Raman adiabatic passage

Vasily G. Arkhipkin, Ivan V. Timofeev, V. P. Timofeev

Published May 3, 2006• 0 citations

Abstract

We show that in optically dense medium, consisting of three-level Λ-atoms, the effect of fractional stimulated Raman adiabatic passage leads to the maximum coherence on Raman transition to length of the medium considerably exceeding length of the linear resonant absorption. The general case of unequal forces of oscillators on the coupling transitions is analyzed. Results are of interest for a coherent anti-Stokes Raman spectroscopy with the delaying pulses.

DOI: 10.1117/12.677878

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Preparation of maximal atomic coherence in space by fractional stimulated Raman adiabatic passage

Vasily G. Arkhipkin, Ivan V. Timofeev, V. P. Timofeev

Published May 3, 2006• 0 citations

Publisher

Abstract

DOI: 10.1117/12.677878

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We have experimentally demonstrated the enhancement of coherent Raman scattering in

\mathrm{Rb}

atomic vapor by exciting maximal atomic coherence with fractional stimulated Raman adiabatic passage. Experimental results are in good agreement with numerical simulations. The results support the possibility of increasing the sensitivity of coherent anti-Stokes Raman spectroscopy by preparing maximal atomic or molecular coherence using short pulses.

T_{1,2}

(

T_2>T_1

) are supposed to be shorter than all relaxation times in the medium. We present analytical and numerical solutions of the self-consistent set of coupled Schr\\"{o}dinger equations and reduced wave equations in adiabatic limit with taking into account the first non-adiabatic correction. The adiabaticity criterion with account of pulse propagation is studied. We find that propagation dynamics depends on the relationship between the transition oscillator strengths. It is shown that at the initial stage of propagation the envelopes of the pulses slightly change along the length of the medium. This distance can be large compared to one-photon resonant absorption length of the medium. Also it is possible a regime of complete reemitting of the probe pulse into the coupling one during propagation. A spatial evolution of the atomic Raman coherence is investigated in detail too.