Silicon nitride micro rings are widely used integrated optical devices that generate photonic states for precise measurement of optical frequency combs and quantum information.The stable locking of micro rings is the key to achieving practical applications.This article utilizes the thermal self stability of micro rings and Pound-Drever-Hall(PDH)technology to achieve resonance locking of silicon nitride micro rings.In the experiment,high-precision laser wavelength tuning characteristics were combined to stabilize it near the micro rings resonance wavelength,and then resonance locking was performed using PDH technology.The results indicate that this locking technique,based on the thermal self stability of the micro ring itself,overcomes disturbances and other effects by precisely locking the silicon nitride micro ring,achieving stable output at different powers.When the output power is about 38.9 mW,the corresponding standard deviation is 0.016 mW.This technology has laid the necessary foundation for the application of silicon nitride micro rings in fields such as quantum optics.
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