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Soviet Journal of Quantum Electronics

Four-photon parametric luminescence under conditions of two-frequency excitation of metal vapor by ultrashort light pulses

Anatolii A Afanas'ev, M V Ignatavichyus, B. A. Samson, R V Yakite

Published Jan 31, 1990• 0 citations
Publisher

Abstract

A theoretical analysis is made of the frequency, angular, and energy characteristics of four-photon parametric luminescence in sodium vapor under conditions of two-frequency excitation of the 3S–3D transition by ultrashort light pulses undergoing coherent interaction. The frequency and angular ranges of the efficient scattering were determined for various excitation geometries of the medium. A comparison was made between the theoretical results and the experimental data obtained previously.

DOI
10.1070/qe1990v020n01abeh004795

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A theoretical analysis is made of the frequency, angular, and energy characteristics of four-photon parametric luminescence in sodium vapor under conditions of two-frequency excitation of the 3S–3D transition by ultrashort light pulses undergoing coherent interaction. The frequency and angular ranges of the efficient scattering were determined for various excitation geometries of the medium. A comparison was made between the theoretical results and the experimental data obtained previously.
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A systematic analysis was made of the spectral characteristics of resonance four-photon parametric conversion of infrared radiation as a result of two-photon resonance pumping of the 3S–3D and 3S–5S transitions in sodium and the influence of these characteristics on the threshold sensitivity of a parametric conversion detector was investigated. An experimental study was made of the characteristics of the noise radiation generated as a result of hyperparametric scattering. The results obtained can be used to select the optimal parameters of high-sensitivity detectors of weak infrared signals by parametric conversion in alkali metal vapors.
An experimental investigation was made of the evolution of conically scattered radiation generated by excitation of sodium vapor with pump radiation in the range 16 450–17 360 cm−1 (608–576 nm) in the region of the 3S–3P transition. It was found that the conical structure of the scattered radiation, recorded earlier in the case of near-resonant excitation, was retained in a wide range of the tunable pump radiation frequency. The conical structure observed in the vicinity of two photon resonances of the pump frequency with the 3S–5S and 3S–4D transitions was determined not only by the scattered radiation, similar to that observed in the case of near-resonant excitation, but also by the radiation due to four-photon parametric scattering in the case of full phase matching between the interacting waves.
Investigations are made of hyper-Raman scattering and four-photon parametric processes in two-photon excitation of metal vapor. The laws of propagation of infrared and ultraviolet radiation generated in a metal vapor medium by these processes are found for the steady-state interaction. The nonlinear polarization of the medium is obtained in terms of elements of the atomic density matrix allowing for saturation by the pump field and for the influence of collisions. The spectral and tuning characteristics of the converted radiation are studied and a comparison is made with experimental data. A dip observed in the infrared radiation spectrum for hyper-Raman scattering and its broadening are explained. A detailed discussion is given of the role of collisions that substantially narrow the tuning range of the infrared radiation in hyper-Raman scattering.
The dependence of the third harmonic intensity on the medium length under completely phase-matched and resonant conditions is discussed. It is shown that the conversion efficiency in the coherent transient case is expected to exceed that in the steady state case in a long and/or dense medium when the incident light pulse has sufficient energy. The 3S-5S transition of sodium with a 602.3 nm light is studied experimentally as a model system. The efficiency as a function of the incident light frequency and intensity is in agreement with the predictions. By eliminating the phase-mismatching effect, the dependence on the medium density is also determined. It is demonstrated that the efficiency surely increases even in the higher density of sodium.