Inverse phase matching enhances degenerate optical parametric oscillator stability in microresonators, suggesting improved design possibilities.
We demonstrate a degeneracy-locked counter-propagating optical parametric oscillator in a submicron periodically poled thin-film lithium niobate microresonator. The design achieves locking through backward quasi-phase matching, enabling robust degenerate OPO operation.
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Yang et al. (2025) studied this question.
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