세미나에 다 참석하길. 오후에는 랩 투어 예정이니 준비하고..

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제 목 Nonlinear optical manipulation of ultrashort pulses using quasi-phase matching gratings
강 사 Prof. Kazuo Kuroda
소 속 Institute of Industrial Science, University of Tokyo, JAPAN
시 간 2006년 9월 15일 (금요일) 오전 11시 - 12시
장 소 신공학관 301동 1112호

강사이력
Prof. Kazuo Kuroda was born in Tokyo, Japan in 1947. He received the B. S. and Ph. D. degrees in applied physics from the University of Tokyo in 1971 and 1976, respectively.
In 1976, he joined the Institute of Industrial Science, University of Tokyo, where he has been the Professor of Applied Optics since 1993.
His current research interests include the development of the photorefractive materials and the application of the photorefractive materials to the optical information processing and the optical measurements. He is also interested in the nonlinear optical manipulation of ultrashot pulses using quasi-phase matching gratings.
Dr. Kuroda is a member of SPIE, OSA, IEEE, the Optical Society of Japan, and the Japanese Society of Applied Physics. He is a former President of the Optical Society of Japan.

Abstract
My group is conducting the research on the nonlinear optical frequency conversion of ultrashort pulses (100 fs or less pulse width) using periodically (or aperiodically) polled lithium niobate crystals.
I will talk about our recent results of the following three topics:
(1) Effectively-group-velocity-matched second- and third-harmonic generations in noncollinear geometry: I will present a novel method for efficient third-harmonic generation of ultrashort pulses by use of a two-dimensionally poled quasi-phase-matching device. Group velocity mismatch between fundamental, the second harmonic, and the third harmonic waves are compensated effectively introducing the spectral angular dispersion.
(2) Optical parametric amplification of 60-fs infrared pulse at the wavelength of around 3500 nm using a periodically poled MgO doped lithium niobate: Mid infrared region of spectrum is important for molecular spectroscopy. I will present our recent result on the generation of ultrashort mid infrared pulses.
(3) Adiabatic compression of quadratic temporal solitons in aperiodic quasi phase matching grating: Quadratic cascaded nonlinear process with small but non-zero phase mismatch changes nonlinearly the phases of interacting fundamental and the second harmonic waves. This nonlinear phase can be used for the soliton compression of optical waves. I will present the numerical results of the pulse compression.