Optical frequency combs provide a powerful tool for precise measurement of the optical
frequency, holding significant importance in fields such as spectroscopy, optical …

The nonlinear coupling between on-chip confined optical modes and free-space continuum
modes is investigated. The radiation of second-harmonic wave due to the pump fields in …

For the applications of the frequency comb in microresonators, it is essential to obtain a fully
frequency-stabilized microcomb laser source. Here, we demonstrate an atom-referenced …