Soviet Journal of Quantum Electronics

Characteristics of resonant parametric conversion of infrared radiation in sodium vapor

Andrey V Aleksandrov, S. A. Pleshanov, Vladimir S Solomatin

Published Mar 31, 1982• 1 citation

Abstract

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.

DOI: 10.1070/qe1982v012n03abeh012177

Related papers

Resonant frequency conversion in sodium vapor

Vladimir S Solomatin, A N Meleshko, Victor V. Krasnikov

Infrared radiation was converted in Na vapor by two-photon resonant pumping of the 3s–4s forbidden transition in the presence of a quasiresonant signal. The calculated dependence of the conversion efficiency on the signal wavelength was in qualitative agreement with the experimental results.

Soviet Journal of Quantum ElectronicsJun 30, 19790 citations

Parametric noise in a nonlinear frequency up-converter of infrared signals by two-photon pumping of 3S–3Dand 3S–5Stransitions in sodium vapor

Yu A Galaĭchuk, Vladimir A. Kudryashov, V. L. Strizhevskiǐ +2 more

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.

Soviet Journal of Quantum ElectronicsJul 31, 19850 citations

Efficient parametric sum-frequency generation by noncoherent two-photon pumping of metal vapors

Andrey V Aleksandrov, S. A. Pleshanov, Vladimir S Solomatin

Four-photon parametric sum-frequency generation in a randomly modulated (noncoherent) pump field was investigated, and an expression obtained for the quantum conversion efficiency. It was found experimentally that on broadening the pump line by a factor of 20–30 (lowering the spectral density by a factor of 10–20) the quantum conversion efficiency for 9.27 μ radiation in sodium vapor reached 35%, exceeding that for the case of quasimonochromatic pumping.

Soviet Journal of Quantum ElectronicsOct 31, 19820 citations

Four-photon resonance parametric up-conversion of a weak infrared signal in a nonmonochromatic pump field

N. A. Iskanderov, Vladimir A. Kudryashov, I. N. Matveev +1 more

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.

Soviet Journal of Quantum ElectronicsOct 31, 19814 citations

Effective frequency conversion of radiation in sodium vapor

Vladimir S Solomatin, A N Meleshko

An investigation was made of frequency conversion in sodium vapor. When the phase-matching conditions were satisfied and the nonlinear susceptibility increased under signal resonance conditions, the quantum efficiency of the conversion process was 40% at low pumping rates.

Soviet Journal of Quantum ElectronicsJul 31, 19790 citations

Four-photon parametric up-conversion in sodium vapor pumped with monochromatic and noise radiation under strong and weak dispersion conditions

Andrey V Aleksandrov, Vladimir S Solomatin

A theoretical investigation is made of the influence of various effects on four-photon parametric upconversion in metal vapors: saturation, one-photon absorption of output radiation, two-photon depletion of pump radiation, wave detuning, and dispersion of the group velocities of the interacting waves. Estimates indicate that the simultaneous influence of all these effects can ensure a fairly efficient up-conversion of noise pump radiation, compared with the monochromatic case. The results agree well with the experimental results obtained in a study of conversion of tunable CO2 laser radiation in sodium vapor.

Soviet Journal of Quantum ElectronicsOct 31, 19830 citations