A hybrid-integrated visible laser source is demonstrated using the photogalvanic effect. Self-injection locking of a 1560 nm semiconductor laser to a high-Q $\mathrm{S}\mathrm{i}_{3}\mathrm{N}_{4}$ resonator generates high-coherence 780 nm emission (4 Hz2/Hz frequency noise floor).

Self-injection locking of a 1560 nm semiconductor laser to a high-Q silicon-nitride resonator creates a high-coherence 780 nm visible laser source using the photogalvanic effect.

Paper

High-Coherence Hybrid-Integrated 780 nm Source by Self-Injection-Locked Second-Harmonic Generation in a High-Q Silicon-Nitride Resonator

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