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The on-chip creation of coherent light at visible wavelengths is crucial tofield-level deployment of spectroscopy and metrology systems. Although on-chiplasers have been implemented in specific cases, a general solution that is notrestricted by limitations of specific gain media has not been reported. Here,we propose creating visible light from an infrared pump by widely-separatedoptical parametric oscillation (OPO) using silicon nanophotonics. The OPOcreates signal and idler light in the 700 nm and 1300 nm bands, respectively,with a 900 nm pump. It operates at a threshold power of (0.9 +/- 0.1) mW, over50x smaller than other widely-separated microcavity OPO works, which have onlybeen reported in the infrared. This low threshold enables direct pumpingwithout need of an intermediate optical amplifier. We further show how thedevice design can be modified to generate 780 nm and 1500 nm light with asimilar power efficiency. Our nanophotonic OPO shows distinct advantages inpower efficiency, operation stability, and device scalability, and is a majoradvance towards flexible on-chip generation of coherent visible light.

Milliwatt-threshold visible-telecom optical parametric oscillation using silicon nanophotonics