Fig. 4: Scheme for fully stabilizing an on-chip soliton microcomb utilizing the ultra-high Q microrod cavity.
From: Boosting silica micro-rod Q factor to 8.28 × 109 for fully stabilizing a soliton microcomb
a System setup, there are two parts: one is the feedback module based on the microrod (orange), the other one is the soliton Kerr microcomb generator. b Full stabilization operation of the soliton microcomb, using the ultra-high Q microcavity. c Optical spectrum of the fully stabilized soliton microcomb, here we mark two peaks: the auxiliary laser, and the pump laser. d Scheme for measuring the noise of the pump laser (left) and for measuring the noise of repetition rate (right). e Spectrum of the beat note #1, before (blue curve) and after (red curve) stabilization. f Long-term stability of the beat note #1. g Spectrum of the beat note #2, before (blue curve) and after (red curve) stabilization. h Long-term stability of the beat note #2.
