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Nonlinear optical processes in whispering gallery mode (WGM) microresonatorshave attracted much attention. Owing to the strong confinement of light in asmall volume, a WGM microresonator can dramatically boost the strength of lightfield, thereby promoting the nonlinear interaction between the light and theresonator material. However, realization of efficient nonlinear parametricprocess in microresonators is a challenging issue. The major difficulty is tosimultaneously ensure the phase matching condition and a coherent multipleresonance condition for all the waves participating in the nonlinear conversionprocess. Here, we demonstrate highly efficient second harmonic generation (SHG)in an on-chip lithium niobate microresonator fabricated by femtosecond laserdirect writing. We overcome the difficulty of double resonance for the phasematched pump and second harmonic waves by selectively exciting high order modesin the fabricated thin-disk microresonator. Our technique opens opportunitiesfor integrated classical and quantum photonic applications.

Phase matched second harmonic generation in an on-chip lithium niobate microresonator fabricated by femtosecond laser