University of California, Riverside

Department of Electrical and Computer Engineering

Faculty Recruitment Seminar: Dr. Hossein Taheri presents a talk on

Faculty Recruitment Seminar: Dr. Hossein Taheri presents a talk on

Faculty Recruitment Seminar: Dr. Hossein Taheri presents a talk on

April 25, 2017 - 12:10 am
Winston Chung Hall 215


A train of ultrashort optical pulses is comprised of a large number of laser tones oscillating synchronously. This equally spaced array of frequencies, called an optical frequency comb, has found applications in sensing and spectroscopy, calibration of astronomical spectrograms and search for exoplanets, timekeeping and the most accurate clocks, self-driving cars and LIDAR, and the precise measurement of some of the fundamental physical constants of the universe. The unparalleled metrology applications of optical frequency comb technology was recognized by the 2005 Noble Prize in Physics. While optical frequency combs were originally realized by femtosecond mode-locked laser sources, in the past decade their demonstration in micron-scale and chip-based optical resonators made from Kerr-nonlinear materials bears the promise of simplifying their various applications and making them available at significantly reduced cost, size, and weight. The objective of my research is to provide a fundamental understanding of the process of frequency comb formation in nonlinear media and address the practical challenges posed by platform miniaturization in microresonator-based optical frequency comb (microcomb) generation. This talk will highlight my research on the deterministic generation of stable ultrashort pulses (temporal solitons) in integrated photonic platforms, wavelength-specific engineering of microresonator structures for broadband microcomb generation, and innovative techniques for addressing the long-standing problem of stabilization of small-bandwidth microcombs for low phase noise radio-frequency (RF) signal generation and use in optical atomic clocks.


Dr. Hossein Taheri received his PhD and master’s degrees in Electrical and Computer Engineering with minor in Physics from the Georgia Institute of Technology, and his bachelor’s degree in Electrical and Computer Engineering from the University of Tehran. His areas of interest and expertise include nonlinear and ultrafast optics, synchronization phenomena and nonlinear dynamics, and integrated photonics. His research on fast and power-efficient optoelectronic modulators and on microresonator-based Kerr frequency comb generation was conducted at the Georgia Tech Photonics Research Group, in collaboration with the Center for Nonlinear Science and the Ultrafast Optics Lab at the Georgia Tech School of Physics, as well as at OEwaves Inc., the first company to productize resonator-based optical frequency combs, where Dr. Taheri was a research scientist. He was the co-founder and president of the Optical Society of America (OSA) Student Chapter at Georgia Tech, was awarded the Center for Academic Partnership Research Grant from NASA’s Jet Propulsion Laboratory (JPL) and the Georgia Tech Anne Robinson Clough Student Award, and was a medalist in the Iranian National Electrical Engineering and Physics Olympiads.

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University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

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Electrical and Computer Engineering
Suite 343 Winston Chung Hall
University of California, Riverside
Riverside, CA 92521-0429

Tel: (951) 827-2484
Fax: (951) 827-2425
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