CA DREAMS - Technical Seminar Series

Speaker: Chee Wei Wong, Professor, UCLA

Talk Title: Precision Chip-scale Laser Frequency Microcombs at the Fundamental Limits

Series: CA DREAMS - Technical Seminar Series

Abstract: Chip-scale laser frequency microcombs has achieved equidistant coherent frequency markers over a broad spectrum, advancing frontiers in time-frequency standards, analog-digital conversion, dense communications, qubit spectroscopy, and precision metrology. In this talk we will describe coherent mode-locking in frequency microcombs, verified by interferometric phase-resolved ultrafast spectroscopy at sub-100-attojoule sensitivities. Normal dispersion sub-100-fs mode-locking is observed, supporting by first-principles nonlinear modeling and analytical predictions. Secondly, we will describe the noise limits in full stabilization of frequency microcombs, locking down both the high-frequency repetition rate and one of the comb lines against a reference. Active stabilization improves the long-term stability by six orders of magnitude, reaching a record instrument-limited residual instability of 3.6 mHz per root tau and a tooth-to-tooth relative frequency uncertainty down to 50 mHz and 2.7×10^(−16). Thirdly, we will describe the femtosecond timing jitter metrology of the microcombs at the thermodynamical and quantum noise limits. Self-heterodyne linear interferometer circumvents the amplitude-to-phase noise conversion and improves the shot noise limits. Fourthly, with 1-Hz resolution on our optical 200-THz carriers, measurements of a compact reference laser at sub-10-Hz/root-Hz spectral densities will be described. Our examinations support the modular implementations of field-deployed next-generation frequency metrology, timing clocks and communications.

Biography: Professor Chee Wei Wong examines ultrafast, precision, and quantum measurements in mesoscopic systems. He serves as a faculty member at the University of California and, prior to that, a tenured faculty member at Columbia University. He is elected a member of the National Academy of Inventors and the American Association for the Advancement of Science, and a Fellow of APS, IEEE, OSA, ASME and SPIE. He is a recipient of the DARPA Young Faculty Award, NSF CAREER Award, Google Faculty Award, NIH Early Scientist Trailblazer Award, and 3M Faculty Award among others. He completed his Sc.D. (2003) and M.Sc. (2001) from MIT, and his B.Sc. and B.A. from UC Berkeley in 1999. His work has appeared in more than 430 journals and conferences, including Nature, Science and Phys. Rev. Lett. series. He delivered 135+ plenary and invited talks at universities and industry, published 4 book chapters, and has worked with 65 PhD students and research scientists, about a third are now in their own professorships including full professors in leading universities.

Host: Dr. Steve Crago

More Info: https://www.isi.edu/events/5752/precision-chip-scale-laser-frequency-microcombs-at-the-fundamental-imits/

Webcast: https://usc.zoom.us/j/97017422125?pwd=Dbrt8MNMrmBV3xalKQJcAiNsggFJjJ.1&from=addon

WebCast Link: https://usc.zoom.us/j/97017422125?pwd=Dbrt8MNMrmBV3xalKQJcAiNsggFJjJ.1&from=addon

Audiences: Everyone Is Invited

Contact: Amy Kasmir

Event Link: https://www.isi.edu/events/5752/precision-chip-scale-laser-frequency-microcombs-at-the-fundamental-imits/

This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.

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