2023/04/04 by Niu, Rui, Wan, Shuai, Hua, Tian-Peng +16
#FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Optics (physics.optics)
paper · doi:10.48550/arxiv.2304.01474
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 stabilized soliton microcomb generation system based on the integrated microring resonator. The pump light around 1560.48 nm locked to an ultra-low-expansion (ULE) cavity, is frequency-doubled and referenced to the atomic transition of 87Rb. The repetition rate of the soliton microcomb is injection-locked to an atomic-clock-stabilized radio frequency (RF) source, leading to mHz stabilization at 1 seconds. As a result, all comb lines have been frequency-stabilized based on the atomic reference and could be determined with very high precision reaching ∼18 Hz at 1 second, corresponding to the frequency stability of 9.5×10-14. Our approach provides an integrated and fully stabilized microcomb experiment scheme with no requirement of f-2f technique, which could be easily implemented and generalized to various photonic platforms, thus paving the way towards the portable and ultraprecise optical sources for high precision spectroscopy.