Transverse modulational instability of counterpropagating quasi-phase-matched beams in a quadratically nonlinear medium.
We find the threshold and the generation angle for transverse instability of quasi-phase-matched counter-propagating fundamental and second-harmonic beams in a bulk c((2)) medium. Numerical estimates indicate that the instability should be observable with currently available materials.
Lushnikov
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PM
Lodahl
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Saffman
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