Nonlinear interaction in a poling-free micro-racetrack resonator on thin film lithium niobate:Spontaneous quasi-phase matched second harmonic generation
Effective nonlinear coefficients in anisotropic crystals that depend on the direction of the wavevector provide an effective approach to the poling-free quasi-phase matched nonlinear process.Recent study shows that by designing the geometry and the orientation relative to the optics axis in a racetrack resonator on X-cut thin film lithium niobate,both the resonance and quasi phase-matching condition between fundamental and second-harmonic wave in TE-fundamental modes can be satisfied,thus the intracavity nonlinear frequency conversion process can be precisely controlled.Dual-resonant 37th-and 111th-order spontaneous quasi-phase matched second harmonic generation processes are experimentally demonstrated,and the results agree well with the theoretical prediction.
lithium niobate on insulatormicro racetrack resonatorquasi-phase matchingsecond harmonic
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