Prof. Takeshi Kamiya
Prof. Takeshi Kamiya (born in 19 July 1939) has been serving as the elected member of Board of Governors of IEEE / LEOS for the term 1996-1998, as well as the Chair of LEOS Tokyo Chapter since February 1998.
He studied Applied Physics at University of Tokyo and earned BE,ME and DE degrees in 1963,1965 and 1970, respectively. He became an associate professor in 1969 and has been full professor since 1987. In 1974 and 1978 he stayed at Max-Planck institute for solid state research at Stuttgart and investigated quantitative impurity analysis in GaAs by D-A pair photoluminescence dynamics [1] in collaboration with Prof. Hans Queisser and Dr. Elmar Wagner.
Professionally his home ground has been “semiconductor optoelectronics”.
High speed modulation characteristics of semiconductor lasers by Gunn effect switch at Gbit/s range was studied in 1974, as cited in IEEE selected reprint series on semiconductor lasers [2]. Also theoretical studies of distributed feedback structures and grating coupler on planar waveguide were conducted in 1977, as cited in SPIE Milestone reprint series [3]. During 1980’s intensive studies of ultrafast optoelectronics were started. Using higher order sub-band in quantum wells, gain-switched pulses less than 4 ps were generated in 1988 [4]. A combination of a gain-switched semiconductor laser and a fiber-optic soliton compressor offers a compact sub-picosecond pulse generator, which was assembled and was applied to desk-top electro-optic sampling set-up with temporal resolution of 2 ps [5]. More recently extending this technique to multi-stage compression, pulse width as short as 65 fs was achieved, which is the shortest ever reported on semiconductor laser originated pulse [6].
Understanding and control of chirp characteristics is also an important issue in handling ultrashort pulses from mode-locked semiconductor lasers [7].
He served for academic communities both domestically and internationally.
He has been the member of program committee for IEEE Semiconductor Laser Conferences (SLC). In 1992 he took a responsibility of hostng SLC at Takamatsu as steering committee chair. In initiating CLEO/Pacific Rim he served as the founding steering committee chair, and then as Conference co-chair for the second CLEO/Pacific Rim ‘97, together with Prof. Yasuharu Suematsu. Presently he is a steering committee member representing LEOS.
The necessity to urgently promote ultrafast optoelectronics both scientifically and technologically was recognized already in early 1990’s.
He has been an active board member of Femtosecond Technology Consortium, a ten year government supported program in Japan. He is currently the Conference Chair for Femtosecond International Workshop (FST’99) at Makuhari, Chiba in July 1999.
In one of the academic societies in Japan, namely Institute of Electronics, Information and Communication Engineers (IEICE), he has been the President of Electronics Society (ES/IEICE) for 1997-1998 term. Promotion of global interaction among active researchers and engineers by bridging university laboratories and academic societies of different countries is one of his continuing concern.
A number of foreign students and guest scientists have stayed in his laboratory. Majority are from Asia and Pacific Rim (Australia, China, Korea, Nepal, Philippines, Singapore, Thailand ) but some are also from other part of the world (Austria, Canada, France, Germany, USA ). Most recently he is interested besides ultrafast optoelectronics also in such topics of modern functional optics as: liquid crystal functional device (dynamic grating as low power beam deflector applicable to inter-satellite optical communication) [8]; broadband anti-reflection coating for functional semiconductor optical amplifiers and mode-locked semiconductor lasers [9]; optical parallel pattern recognition using joint Fourier transform correlators [10].
[1] T.Kamiya, E.Wagner, “Optical Determination of Impurity Compensation in n-type GaAs ” J. appl. Phys. Vol.16 (1977) 1928-1935.
[2] H.Yanai, M.Yano, T.Kamiya, “ Direct modulation of a Double Heterostructure Laser using a Schottky Barrier Gate Gunn Effect Digital Device ” IEEE J. Quantum Electron. Vol.11 (1975) 519-524.
[3] Y.Yamamoto, T.Kamiya, H.Yanai, “ Improved Coupled Mode Analysis of Corrugated Waveguides and Lasers I, II ” IEEE J. Quantum Electron. Vol. 14 (1978)245-258, 620-624.
[4] R.Nagarajan, T.Kamiya, A.Kasukawa, H.Okamoto, “Observation of Ultrashort (<4ps) Gain Switched Optical Pulses from Long Wavelength Multiple Quantum Well Lasers” Appl. Phys. Lett. Vol.13 (1989) 1273-1275.
[5] R.Sahara, H.Takeshita, K.Miwa, M.Tsuchiya, T.Kamiya, “ Electrooptic Sampling Evaluation of 1.5 micron MSM Photodiodes by Soliton Compressed Semiconductor Laser Pulses ” IEEE J.Quantum Electron. Vol.31 (1995) 120-125.
[6] M.Miymoto, M.Tsuchiya, H.F.Liu, T.Kamiya, “ Generation of Ultrashort ( 65 fs) Pulses from 1.55 Micron Gain Switched Distributed Feedback Laser with Soliton Compression by Dispersion Arrangements ” Japanese J. appl. Phys. Vol.35 (1996) L1330-L1332.
[7]M.Schell, M.Tsuchiya, T.Kamiya, “ Chirp and Stability of Mode-Locked Semiconductor Lasers ” IEEE J. Quantum Electron. Vol. 32 (1996) 1180-1190.
[8] W.Klaus, M.Ide, S.Morokawa, M.Tsuchiya, T.Kamiya, “ Angle-Independent Beam Steering using a Liquid Crystal Grating with Multi-Resistive Electrodes ” Optics Communications Vol.138 (1997) 151-157.
[9] J.Lee, T.Tanaka, S.Sasaki, S.Uchiyama, M.Tsuchiya, T.Kamiya, “ Novel Design Procedure of Broadband Multilayer Antireflection Coatings for Optical and Optoelectronic Devices ” J. Lightwave Technology Vol. 16 (1998) 884-891.
[10] R. Thapliya, H.Koizumi, K.Kodate, T.Kamiya, “ Parallel Joint Transform Correlator applied to Devanagari Script Recognition ” Applied Optics accepted for publication in 1998.