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Transient analysis of degenerate four-wave mixing with orthogonally polarized pump beams in a saturable Nd:YAG amplifier

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2 Author(s)
Brignon, A. ; Lab. Central de Recherches, Thomson-CSF, Orsay, France ; Huignard, J.P.

Degenerate four-wave mixing with orthogonally polarized pump beams at λ=1.06 μm in the saturable gain of a flash-lamp-pumped Nd:YAG amplifier is investigated, both experimentally and theoretically, using pulses of duration much less than the population relaxation time. We introduce a new set of coupled-wave equations in this short pulse regime that includes the effect of the four interacting waves and the laser gain experienced by all the beams. The dependence of the efficiency of the process on the small-intensity-gain-length product, beam ratios, and fluences is analyzed. A reflectivity of a weak probe beam of 25 percent and a transmission-gain-grating diffraction efficiency of 32 percent are achieved. Finally, the temporal shape of the conjugate signal is studied for various gain-saturation regimes

Published in:

Quantum Electronics, IEEE Journal of  (Volume:30 ,  Issue: 9 )

Date of Publication:

Sep 1994

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