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Journal of Modern Optics

Light-pulse Propagation through Atomic Caesium Vapour in Conditions of Coherent Interaction with Two-photon Absorbing Medium

N.P. Garayantz, V.S. Grigoryan, S.A. Michaelian, K.B. Petrossian, K. Pokhsrarian

Published Mar 1, 1991• 7 citations
Publisher

Abstract

The propagation effect of a 2πn pulse in atomic caesium vapour in conditions of two-photon resonance has been observed. Comparison of experimental and theoretical results is made.
DOI
10.1080/09500349114552821

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Coherent propagation of a circularly polarized pulse which is two-photon quasi-resonant with a medium of multi-level atoms is considered in the adiabatic following limit. The relevant pair of non-linear coupled partial differential equations are solved exactly for arbitrary pulse shapes. The development of the envelope and the phase of the pulse as it propagates through the medium is described analytically. Perturbation theoretical results are shown to apply only for small intensity or small distance of propagation or both. Qualitatively different results apply for higher intensities and longer distances of propagation. These include strong self-phase-modulation effects as well as reshaping of the pulse envelope.