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Efficient telecom to visible wavelength conversion in doubly resonant GaP microdisks

Abstract

Resonant second harmonic generation between 1550 nm and 775 nm with outside efficiency >4.4×104mW1> 4.4\times10^{-4}\, \text{mW}^{-1} is demonstrated in a gallium phosphide microdisk cavity supporting high-QQ modes at visible (Q104Q \sim 10^4) and infrared (Q105Q \sim 10^5) wavelengths. The double resonance condition was satisfied through intracavity photothermal temperature tuning using 360μ\sim 360\,\muW of 1550 nm light input to a fiber taper and resonantly coupled to the microdisk. Above this pump power efficiency was observed to decrease. The observed behavior is consistent with a simple model for thermal tuning of the double resonance condition.Comment: 6 pages, 4 figure

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