Abstract
A new type of quasi-phase-matched interactions of light waves is considered — consecutive interactions of waves with frequencies w, 2w, 3w and w, 2w, 4w. They are shown to be possible in a periodically poled LiNbO3:Y:Mg crystal for both co- and counterpropagating waves. It is shown that under certain conditions the energy of a high-intensity pump wave in the consecutive three-frequency interactions under consideration can be completely converted to the energy of one of the other two waves.
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