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AIP conference proceedings

Experimental and numerical study of the collision induced stimulated effects in alkali vapors

Z. Konefał

Published Jan 1, 1997• 0 citations
Publisher

Abstract

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.

DOI
10.1063/1.51849

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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.
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We undertake a theoretical investigation of the coherent optical propagation of Stokes light in a collisionally broadened three-level Raman amplifier. The Stokes light consists of two distinct spectral components: off-resonance stimulated Raman scattering and on-resonance stimulated fluorescence, induced by collisional transfer of population to a near-resonant intermediate state of the atomic system. Our model is based on the semiclassical Maxwell-Bloch formalism where the separation of the Stokes light into two components results in an expansion from the usual 9 to 13 atomic variables. We investigate the model both analytically and numerically. We point out the physical contributions to the simultaneous evolution of pump, fluorescence, and Raman light. We discuss the development during propagation of these separate pulses, emphasizing the nonlinear effects that lead to saturation.
The main properties of infrared stimulated electronic Raman scattering (SERS) at the 6 2 S 1/2 -7 2 S 1/2, 3/2 transitions in cesium atoms are studied theoretically and experimentally as functions of the atomic concentration, which was varied from 10 11 to 10 16 cm −3 . It is found that the efficiency of generation of Stokes radiation strongly depends on one-photon absorption of the pump radiation tuned near frequencies of the 6 2 S 1/2 -7 2 P 1/2, 3/2 transitions. By using the equation for the density matrix, which describes the evolution of a three-level system, the theory of resonance excitation of IR radiation upon one-photon absorption at an adjacent transition is developed. The theory describes well the main features of IR SERS in alkali-metal vapors.
We have observed collisional redistribution of laser light scattered by a three-level atom, thallium, in the presence of argon. The two observed spectral components correspond to Raman scattering and collision-induced fluorescence. We have seen the growth of both components from spontaneous to stimulated scattering as the laser intensity is increased. While the gain for the Raman component agrees with theory, the observed gain of the collision-induced fluorescence is over an order of magnitude lower than predicted.
The passage of strong monochromatic laser radiation through a resonance medium consisting of three-level atoms is investigated. It is shown that if collisions are taken into account in the scattered waves the resonances at combination frequencies occur to first order in the laser field intensity. A numerical analysis of the dependence of the stimulated electronic Raman scattering (SERS) components' gain factors on the pump frequency is carried out. The dispersion curves of the SERS components' gain (absorption) factors for fixed values of pump frequency and intensity are plotted.
A model is developed for the description of stimulated Raman scattering. This model allows for changes in the level populations due to radiative transitions and it can be used also for an arbitrary detuning of the pump radiation from the center of a line of an atom in the active medium. A study is made of the conversion of wide-band laser radiation into a Stokes signal. It is shown that this conversion is quite efficient and the Stokes signal gain corresponds to coherent scattering. This result is related to the matching of the phases of the pump and Stokes signals. Numerical investigations carried out using this model under the experimental conditions described elsewhere give results in agreement with the experimental data.