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Soviet Journal of Quantum Electronics

Conversion of the statistics of picosecond light pulses in a parametric amplifier under strong energy exchange conditions

A Birmontas, R Kupris, Algis S. Piskarskas, V Smil'gyavichyus, A. Stabinis

Published Feb 28, 1980• 1 citation
Publisher

Abstract

The results are given of theoretical and experimental investigations of the conversion of the pump statistics by three-wave parametric amplification of picosecond light pulses under strong energy-exchange conditions. A study is made of the influence of fluctuations of the pump radiation on the parametric conversion efficiency.
DOI
10.1070/qe1980v010n02abeh009944

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A study is made of the evolution of ultrashort pulses of interrogation and generated fields, traveling across a medium after a pump pulse under two-photon resonance conditions. It is shown that, in spite of the absence of overlap of the pulses in space and time, the generated wave becomes phase-locked. The area theorem is obtained for the process in question. It is found that at large distances the second pulse should give rise to a subpulse of the interrogation field and a proportional subpulse whose area tends to zero or to 2π. This conclusion about the formation of subpulses and their limiting areas applies also in the two-photon interaction case. A report is given of an estimate of the threshold intensities of an interrogation pulse in cesium and sodium vapors. The maximum conversion efficiency is found as a function of the pump energy, parameters of the investigated medium, and frequencies of the interacting fields. It is shown that an overall conversion efficiency close to 100% can be obtained when the intensities of the pump and interrogation fields are within the capabilities of the currently available lasers.
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We report the results of experimental investigation of radiations amplification in stimulated four-wave parametric mixing in potassium vapor using two cells holding active medium (generator-amplifier system). Under the two-photon excitation on 4S→6S transition, the gain of parametrically generated violet radiation on 5P→4S transitions is caused by the amplification of infrared radiation on 6S→5P transitions due to optically pumped stimulated emission process. The optimum conditions for seed radiations amplification are found. For these conditions we realized, for the first time, an image conversion from infrared region of spectrum (3.66 µ) to violet (0.4 µ) with quantum efficiency of conversion over 100% (“brightness intensification”).