OSE Dissertation Defense by Ning Hsu on Ultrashort Pulses and Frequency Combs: Characterizations, Manipulations, and Applications

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Posted: October 17, 2020

Date: Tuesday, October 27, 2020 

Time:  10:00 AM to 11:30 AM

Location:  via Zoom

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Committee members:

Dr. Jean-Claude Diels (advisor)
Dr. Arash Mafi
Dr. Matthias Lenzner
Dr. R. Jason Jones
Dr. Ladan Arissian


Ultrafast lasers, or ultrashort pulses, although just being part of the laser science and technology in general, has an immense role both in academia and industry. Here I focus on three aspects of this field, which include measuring ultrashort pulses, structuring the frequency combs and compressing the ultrashort pulses, and applying ultrafast lasers to intra-cavity sensing. Since ultrafast science is a field that is continuously evolving and progressing, this will no mean provide the most pioneering concepts or cutting-edge technology at any given time in the future. It is merely discoveries in my adventurous journey while studying as a Ph.D. student. My contributions are briefly summarized here: First, a novel ultrashort pulses characterization method is proposed and demonstrated that retrieves the spectral phase using the interference of the second harmonics generation's spectra. Second, I developed an ABCD time transfer matrix to analyze the dynamics of structured optical frequency combs and developed a novel 355nm ps laser using pulse compression from the cascading effect of second-order nonlinearities. Third, a two-steps stabilization technique is demonstrated in Chapter 4 to increase the sensitivity of the intra-cavity phase interferometry based on a synchronously-pumped optical parametric oscillator.