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Incoherent broad-bandwidth cw-pumping singly resonant Ti:LiNbO3 integrated optical parametric oscillators, in the quasi-phase-matched nondegenerate type I {eee} configuration, may efficiently generate coherent signal output by the convection-induced phase-locking mechanism. The incoherence of the pump is absorbed by the idler wave, propagating at the same group velocity, while the finite temporal walk-off of the signal with respect to the pump and idler waves determines a signal coherence gain of more than 4 orders of magnitude.
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Montes et al. (2007) studied this question.
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