Abstract
The conditions are investigated for the resonant parametric generation of coherent electromagnetic multipole radiation in a gas laser amplifier by two light waves which interact with two coupled atomic transitions. Cross susceptibility tensors are derived within a semiclassical model taking the polarization of light and atoms into account. Doppler broadening restricts the generation to a difference frequency in a “folded” array of levels. In a specific example an intensity of 10−10 W/mm2 is estimated.
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