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Soviet Journal of Quantum Electronics

Conversion of tunable infrared radiation in alkali metal vapors

Sergei A. Komarov, Victor V. Krasnikov, Vladimir S Solomatin

Published Nov 30, 1980• 0 citations
Publisher

Abstract

A study was made of conversion of radiation in alkali metal vapors involving two-photon excitation of a forbidden transition by high-power pump radiation and by a weak infrared signal. Measurements showed that, in addition to tunability over a wide frequency range, such conversion was of the narrow-band type and could be used in a nonlinear infrared spectrometer.

DOI
10.1070/qe1980v010n11abeh010398

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Soviet Journal of Quantum Electronics•Oct 31, 1981•4 citations
A study was made of conversion of radiation in alkali metal vapors involving two-photon excitation of a forbidden transition by high-power pump radiation and by a weak infrared signal. Measurements showed that, in addition to tunability over a wide frequency range, such conversion was of the narrow-band type and could be used in a nonlinear infrared spectrometer.
A study was made of the dependences of the efficiency of resonant parametric frequency conversion in sodium vapor on the infrared radiation wavelength, vapor density, and detuning from two-photon pump resonance. It was found in this conversion system that for each infrared wave the conversion efficiency had three maxima on tuning the frequency of two-photon pumping over the region of a forbidden transition. The principal maximum was realized for accurate two-photon resonance, and the two other maxima resulted from a rise in the cubic susceptibility close to single-photon sum-frequency resonances. A quantum efficiency of 35% was achieved for a 9.26 μ infrared wave.
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.
Four-photon parametric up-conversion of a weak infrared signal under conditions of two-photon resonance of a constant nonmonochromatic pump field is analyzed allowing for population migration, transient response of the medium, Stark shift of the levels, and width of the pump frequency spectrum. It is found that under steady-state conversion conditions in a nonmonochromatic pump field, it is possible to achieve an average conversion efficiency differing only negligibly from the maximum conversion efficiency in a monochromatic pump field. An analysis is made of the influence of optically induced relaxation on the average conversion efficiency in the transient regime. Numerical estimates are made of the transition parameters for an alkali metal vapor in a frequency-degenerate pump field exciting a two-photon transition.