This research demonstrates an optical parametric oscillator using a single coherence length GaSe crystal, highlighting its four-wave mixing capability.
We demonstrate an OPO based on a single coherence length GaSe crystal ( L ≈80μm) pumped by Cr:ZnS laser pulses (2.35μm, 42fs, 80MHz). Interestingly, the OPO operation is based on four-wave rather than three-wave mixing.
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Kusolthossakul et al. (2025) studied this question.
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