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Influence of propagation on off-resonant molecular excitation

Joseph H. Eberly, Marek J. Konopnicki, Bruce W. Shore

Published Jan 1, 1980• 0 citations
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Abstract

The proposal of Makarov, Cantrell, and Louisell regarding stimulated inelastic resonance fluorescence (SIRF) is shown to not accurately represent the effects of propagation on off-resonant excitation of two-level model molecular absorbers.

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A computational and experimental study of the optical propagation of light in a collisionally broadened three-level Raman amplifier is presented. The Stokes light consists of two distinct spectral components: of resonance stimulated Raman scattering (SRS) and on-resonance stimulated fluorescence (ASE). The intensity dependence of these effects on the buffer gas and on the intensity and detuning of the exciting radiation are calculated. We have carried out the calculation over physically realistic propagation distance. The theoretical model for a description of ASE i SRS signals generation in such a system was developed. The numerical calculations based on the rate equations agree with the experimental results.
A computational study of the optical propagation of Stokes light in a collisionally broadened three-level V-system Raman amplifier is presented. The Stokes light consists of two distinct spectral components: off-resonance stimulated Raman scattering and on-resonance stimulated fluorescence. These two signals are induced by collisional transfer of population from the excited state to the state. The intensity dependence of these effects on the buffer gas and intensity and detuning of the exciting radiations is calculated. In the calculations the probe signals and spontaneous scatterings were used to induce the stimulated signals. We have carried out the calculations over physically realistic propagation distances. The theory was compared with our experimental work and the results of the numerical analysis are used to explain some events observed in the experiments in which the physical mechanism has not yet been understood.