Seminar by Prof. Tanabe: "Comb generation in a silica WGM microcavity: The effects of opto-mechanical coupling and stimulated Raman scattering""


Wednesday, January 25, 2017 - 17:00 to 18:00


B503, Center Building


Title:  Comb generation in a silica WGM microcavity: The effects of opto-mechanical coupling and stimulated Raman scattering

Speaker: Professor Takasumi Tanabe

Affiliation: Keio University

Abstract:  Cascaded four-wave mixing that is present in ultrahigh-Q whispering gallery mode microcavities allow us to obtain Kerr comb spectrum with continues wave pump [1].  We are particularly interested in silica toroid microcavity because it is integrated on a silicon chip.  However, this cavity is known to exhibit opto-mechanical coupling, which may result in output power fluctuation if it is used for Kerr comb generation.  In the first half of my talk, I will discuss on the relationship between the opto-mechanics and the Kerr comb generation.  In the second half, I will show on the method to control the stimulated Raman scattering (SRS) in WGM microcavity system [2].  The competition between the Raman gain and four-wave-mixing gain is discussed and the transverse mode interaction due to SRS process is shown.  I also discuss that a broad bandwidth visible light is generated as a result of SRS comb [3].

[1] T. Kato, et al. Jpn. J. Appl. Phys. 55, 072201 (2016).

[2] T. Kato, et al. Opt. Express 25, 857 (2017).

[3] A. C.-Jinnai, et al. Opt. Express 24, 26322 (2016).



He received his B.S. in Electronics and Electrical Engineering from Keio University, Yokohama, Japan, in March 2000, and his M.S. and Ph.D. in Integrated Design Engineering from the same institution in September 2001 and March 2004, respectively.

On April 2004 he joined NTT Basic Research Laboratories, NTT Corporation, in Atsugi, Japan. On April 2010 he moved to Electronics and Electrical Engineering in Keio University where he is currently an associate professor. He received Scientific American 50 Award in 2007, and The Commendation for Science and Technology by the Minister of Education,Culture, Sports, Science and Technology, The Young Scientists’ Prize, in 2010.

Dr. Tanabe is a member of the Optical Society, IEEE Photonics Society, the Japan Society of Applied Physics, the Laser Society of Japan, and the Institue of Electronics, Information and Communication Engineers.  He has served as a program committee of various conferences, including IEEE/LEOS and CLEO.  He is currently serving as an Associate Editor for AIP Advances.

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