Colloquium: R. Jason Jones скачать в хорошем качестве

Colloquium: R. Jason Jones

"Extreme-Ultraviolet Frequency Combs Based on Intracavity High-Harmonic Generation" Abstract(s): Intracavity high-harmonic generation utilizing femtosecond enhancement cavities has been established as an efficient route for the generation of femtosecond frequency combs in the vacuum-ultraviolet and the extreme-ultraviolet spectral regions. Such XUV frequency combs enable precision spectroscopy of important atomic and potentially molecular spectra in a difficult-to-access spectral region. Our group has demonstrated that a fundamental limitation to this technique is due to intracavity ionization of the gas target by the intense circulating laser pulse. We have recently developed a novel time-resolved dual-frequency comb pump-probe measurement technique to monitor and characterize the intracavity ionization dynamics in real time. An improved understanding of the intracavity ionization has enabled the development of a new generation of XUV frequency comb sources with significantly higher powers, at the greater-than-10-microwatt level per harmonic order extending well below 50 nanometers. In this talk I’ll review the use and impact of frequency comb techniques in ultrafast science and precision spectroscopy, the scientific motivation for its extension to the XUV, and the fundamental limitations of these new sources. In particular, I’ll discuss our work towards establishing dual-comb spectroscopy in the XUV for the first time. Speaker Bio(s): R. Jason Jones is an associate professor at the College of Optical Sciences at the University of Arizona. He received his B.S. from Bethel College in 1994 and his Ph.D. from the University of New Mexico in 2001. He continued on as a National Research Council Postdoctoral Award recipient and then senior research associate at JILA at the University of Colorado until July 2006. He joined the College of Optical Sciences as an assistant professor in August 2006. His research interests include optical physics, high-resolution and ultrasensitive laser spectroscopy, laser cooling and trapping, optical frequency metrology utilizing femtosecond frequency combs, nonlinear optics, and ultrafast optics. Current research involves the extension of the femtosecond frequency comb into the extreme-ultraviolet using intracavity high-harmonic generation. He has over 80 combined journal and conference publications and two patents. He is the recipient of a National Science Foundation CAREER Award (2007) and the U.S. Defense Advanced Research Projects Agency Young Faculty Award (2009), as well as a Kavli Fellow of the National Academy of Sciences (Frontiers of Science 2010). He is a member of the American Physical Society and the Optical Society (OSA).