报告题目：Basics and applications of optical frequency combs

报告人：Dr. Mamoru Endo，University of Colorado

邀请人：赵智刚 教授

时间地点：2019年3月24日（星期天）上午9:30

                  青岛校区振声苑W204

摘要：The optical spectrum of a femtosecond mode-locked laser exhibits a comb-like structure, that is, the longitudinal modes are evenly spaced by a separation equal to the pulse repetition rate. The optical frequencies of such modes can be phase locked to radio frequency (rf) or optical frequency standards. These frequency-controlled mode-locked lasers are referred to as optical frequency combs (OFCs). OFCs have become invaluable tools in high-precision applications, including optical clocks, or metrology and spectroscopy [1,2].

OFCs have been developed in 1990's, and at that time, OFCs were sophisticated laser sources, which could be used only in laboratories. However, recent progress of laser technology enables to develop compact and robust OFCs, and several commercial OFCs are available in the laser market. Thanks to it, OFCs have become to be used not only for pure scientific experiments but also for biological, medical or industrial applications [3]. In this presentation, not only the basics of OFCs but also several applications mentioned above will be presented.

个人简历：Mamoru Endo was born in Kanagawa, Japan, in 1987. He received the B.S, M.S and Ph.D. degrees in applied physics from the University of Tokyo, Tokyo, Japan, in 2011, 2013, and 2016 respectively. In 2016, he joined the Institute for Solid State Physics (ISSP), Kashiwa, as a Postdoctoral Associate, where he worked on high-repetition rate optical frequency comb and high-resolution spectroscopy. After that, he joined Department of Physics, University of Colorado, Boulder as a Research Associate, where he currently works on ultra-low noise optical frequency combs and microwave generation.

Dr. Endo is a member of the Optical Society of America (OSA) and the Japan Society of Applied Physics (JSAP).

References:

1. B. J. Bloom, T. L. Nicholson, J. R. Williams, S. L. Campbell, M. Bishof, X. Zhang, W. Zhang, S. L. Bromley, and J. Ye, "An optical lattice clock with accuracy and stability at the 10-18 level," Nature 506, 71–75 (2014).

2. A. Ozawa, J. Davila-Rodriguez, J. R. Bounds, H. A. Schuessler, T. W. Hänsch, and T. Udem, "Single ion fluorescence excited with a single mode of an UV frequency comb," Nature Communications 8, 44 (2017).

3. K. C. Cossel, E. M. Waxman, F. R. Giorgetta, M. Cermak, I. R. Coddington, D. Hesselius, S. Ruben, W. C. Swann, G.-W. Truong, G. B. Rieker, and N. R. Newbury, "Open-path dual-comb spectroscopy to an airborne retroreflector," Optica 4, 724–5 (2017).