We work on nonlinear dynamics in resonators including chip-scale high-Q microresonators. These nonlinear dynamics are used to create new optical frequencies, which can be used for optical frequency metrology, time-frequency standards, precision spectroscopy, optical communications and optical/microwave synthesis. With a special focus, we work on precision measurements on optical frequency combs. As first/corresponding authors, I have published 25 papers in journals including Nature Physics, Nature Communications, Physical Review Letters, Optica. We focus, but not limited to, the following subjects:
1) Soliton dynamics in nonlinear systems
2) Fabrication of low-loss, highly integrated, dispersion engineered waveguides
3) Electro-magnetic waves synthesis spanning from microwave, mid-infrared to ultra-violet using chip-based photonic devices
4) High speed measurements of spectrum, range, and other physical parameters using
Selected publication includes
1. C. Bao, M-G. Suh, K. Şafak, A. Dai, B. Shen, H. Wang, L. Wu, Z. Yuan, Q-F. Yang, A. Matsko, F. Kartner, and K. Vahala, “Quantum diffusion of microcavity solitons”, Nature Physics, 17, 462-466 (2021).
2. C. Bao†, Z. Yuan†, L. Wu, M.-G. Suh, H. Wang, Q. Lin, and K. Vahala, "Architecture for microcomb-based GHz-mid-infrared dual-comb spectroscopy" Nature Communications 12, 6573 (2021)
3. C. Bao, J. A. Jaramillo-Villegas, Y. Xuan, D. E. Leaird, M. Qi, and A. M. Weiner, “Observation of Fermi-Pasta-Ulam recurrence Induced by Breather Solitons in an Optical Microresonator”, Physical Review Letters 117, 163901 (2016).
4. C. Bao, Y. Xuan, C. Wang, A. Fulop, D. E. Leaird, M. Qi, and A. M. Weiner, “Observation of breathing dark pulses in normal dispersion optical microresonators”, Physical Review Letters 121, 257401 (2018).
5. C. Bao†, M-G. Suh†, and K. Vahala, “Microresonator soliton dual-comb imaging”, Optica, 6, 1110-1116 (2019).
6. C. Bao, Y. Xuan, D. E. Leaird, S. Wabnitz, M. Qi, and A. M. Weiner, “Spatial mode-interaction induced single soliton generation in microresonators”, Optica 4, 1011-1015 (2017).
7. C. Bao†, Z. Yuan†, H.Wang, L.Wu, B. Shen, K. Sung, S. Leifer, Q. Lin, and K. Vahala, “Interleaved differencefrequency-generation for microcomb spectral densification in the mid-infrared”, Optica, 7, 309-315 (2020).
8．C. Bao, W. Chang, C. Yang, N. Akhmediev, and S. T. Cundiff, “Observation of Coexisting Dissipative Solitons in a Modelocked Fiber Laser,” Physical Review Letters 115, 253903 (2015)
9. J. Li†, C. Bao†, Q.-X. Ji†, H. Wang, L. Wu, S. Leifer, C. Beichman and K. Vahala, "Efficiency of pulse pumped soliton microcombs", Optica 9, 231-239 (2022)