Dissipative optical solitons are a special pulse with delicate balance between dispersion and nonlinearity, as well as gain and loss. Their development has a significant implication on ultrafast optics, nonlinear optics, matter waves and hydrodynamics. In the last decade, generating dissipative solitons by coherently pumping high-Q microresonators has emerged and revolutionized the chip-scale frequency comb technique. It also provides an elegant method attain femtosecond pulse trains with a repetition rate of GHz-THz, which is hard to access for conventional mode-locked lasers. In this talk, I will introduce the basic principle of microresonator solitons and methods to generate these new solitons. I will discuss the breathing dynamics of dissipative soliton in optical microresonators, and the microresonator soliton interaction dynamics between co-propagating and counter-propagating soliton pairs. Then, I will discuss how to use the highly mutual coherent counter-propagating solitons for dual-comb spectroscopy with GHz resolution in the mid-infrared.
Chengying Bao is an Associate Professor at the Department of Precision Instruments, Tsinghua University. He obtained the PhD from Tsinghua University in 2016; during his PhD study, he visited JILA for a year. Prior to joining Tsinghua in 2021, he worked as a postdoctoral fellow at Purdue University and California Institute of Technology during 2016 and 2021. He is supported by the Oversea Youth Talent Program, and received the excellent PhD thesis prize from the Chinese Society of Optical Engineering (2018) and the Chorafas Young Researcher award (2016). He mainly works on optical frequency combs, nonlinear optics, ultrafast optics, integrated photonics and microresonator photonics. He has published over 30 papers as the first/corresponding author in journals including Nature Physics, Nature Communications, Physical Review Letters, and Optica.
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai