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Czechoslovak Journal of Physics

On the quantum theory of stimulated Raman scattering II: Effect of detuning and upper-level population

B. K. Mohanty, Partha Sarathi Gupta

Published Mar 1, 1981• 3 citations
Publisher
DOI
10.1007/bf01604510

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A quantum theory of stimulated Raman scattering is established that takes into account the time-dependence of pump laser pulse, two-photon detuning and atomic populations, allowing the general transient and spatial propagation study of Raman memory. Heisenberg–Langevin and Maxwell equations for the collective atomic operators are solved analytically under adiabatic condition , where the electric field envelopes and the collective atomic operators vary slowly. The analytical solution of Stokes/anti-Stokes signal electric field operator is obtained. The spatial–temporal intensity of quantum signal field is studied numerically and analytically for different two-photon detunings and initial populations.
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.