Effect of the spectral width of a two-photon pump on parametric frequency upconversion in metal vapor

Iu. P. Malakian

Andrey V Aleksandrov

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.

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

Marc T. Jacoby, Dennis G. Harris, J. A. Goldstone +2 more

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.