General information

Company name Kokyo, Inc.
Founding April 16th, 2009
Representative director CEO Kazuhiko Sumimura (Ph.D (engneering), MBA, Achievements(in Japanese)Facebook
Capital stock ¥15,000,000 (at Dec. 2012)
Location No.5 Hase Bldg. 2F, 637, Suiginyacho, Shimogyo-ku Kyoto-shi, Kyoto,
600-8411, Japan
  • Management of the free database sites about lasers and optics
  • Distribution of optical products
  • Running the site to learn the basics of optical and laser “Optipedia (in Japanese)”
  • Employment placement business
  • Technical consulting, Contracted development
  • Advertising agency
  • Jun Kimura (Actvila, Ltd. former president, Panasonic Corporation former senior director)
  • Kosuke Takahashi (Lawyer)
  • Sadao Nakai (Osaka Univ. honorary professor,Former president of the graduate school for the creation of new photonics industries,The head of laser society of japan)
  • Yasuo Masuda (Certified social insurance labor consultant)
  • Takafumi Mori (STAGE Co., Ltd. president and representative director)
  • Shigeki Mori (Tax accountant)

Our Team – experts of optics and photonics

Kazuhiko Sumimura

住村Ph. D (Engineering), MBA
Research interest: Fiber laser




Parts of achievements:
K. Sumimura, Y. Genda, T. Ohta, K. Itoh and N. Nishizawa,
“Quasi-supercontinuum generation using 1.06 μm ultrashort-pulse laser system for ultrahigh-resolution optical-coherence tomography,”
Opt. Lett., Vol. 35, 3631 (2010).

Y. Ozeki, W. Umemura, Y. Otsuka, S. Satoh, H. Hashimoto, K. Sumimura, N. Nishizawa, K. Fukui and K. Itoh,
“High-speed molecular spectral imaging of tissue with stimulated Raman scattering,”
Nat. Photonics, Vol. 6, 845 (2012).

Takuji Nakagawa

スクリーンショット 2017-01-13 10.00.33Ph. D (Engineering)
Research interest:Film deposition technology



Parts of achievements:

Nakagawa, T., Kageyama, K., Wada, N., Sakabe, Y., Kirihara, S., & Miyamoto, Y. “Fabrication and Microwave Properties of Three‐Dimensional Photonic Crystals With a Diamond Structure Composed of Ceramic Spheres in Resin”. J. Am. Ceram. Soc.,, 90(4), 1112-1115. (2007).

Nakagawa, T., Kageyama, K., Takagi, H., Sakabe, Y., Kirihara, S., & Miyamoto, Y.. “Diamond-Structure Photonic Crystals Composed of Ceramic Spheres in Resin and Their Microwave Properties”.Jpn. J.Appl..Phys,, 46(10S), 7117. (2007).

Nakagawa, T., Kageyama, K., Takagi, H., Sakabe, Y., Kirihara, S., & Miyamoto, Y.. “Stereolithographic Fabrication and Microwave Properties of 1D Tunable Photonic Crystals Composed of YIG and Alumina Plates in Resin”.J. Am. Ceram. Soc.,91(7), 2195-2200. (2008).


Takashi Kamei

亀井Ph. D (Engineering)
Research interest:Laser induced fluorescence visualization technique, Thorium Nuclear Power and Sustainability.


Parts of achievements:

Kamei, T., “Preliminary Study of Development of the Organization of Rare-Earth Exportation Countries (OREEC) “. J. sustain. dev. energy water environ. syst., 1(1), pp 1-13, 2013.

Kamei, T., “A study of functions of “The Bank (Thorium Energy Bank)” “.Nuclear Safety and Simulation, Vol. 4, Number 1, March 2013.

Kamei, T.,  “Implementation Strategy of Thorium Nuclear Power in the Context of Global Warming”.“Nuclear Power – Deployment, Operation and Sustainability”, book edited by Pavel Tsvetkov, ISBN 978-953-307-474-0, Published: September 9, 2011.

Yoichi Ishikawa

亀井Ph. D (Engineering)
Research interest:Nonlinear optics and Laser spectroscopy



Parts of achievements:
S. F. Chichibu, Y. Ishikawa, H. Kominami, and K. Hara, “Nearly temperature-independent ultraviolet light emission intensity of indirect excitons in hexagonal BN microcrystals”, J. Appl. Phys. 123, 0651041-8 (2018).

M. Takahashi, and Y. Ishikawa, “Terahertz vibrations of crystalline α-D-glucose and the spectral change in mutual transitions between the anhydride and monohydrate”, Chem. Phys. Lett. 642, 29 (2015).

Y. Ishikawa, M. Tashiro, K. Hazu, K. Furusawa, H. Namita, S. Nagao, K. Fujito, and S. F. Chichibu, “Local lifetime and luminescence efficiency for the near-band-edge emission of freestanding GaN substrates determined using spatio-time-resolved cathodoluminescence”, Appl. Phys. Lett. 101, 212106 (2012).

Y. Ishikawa, M. Sugawara, M. Hoshi, M. Hiroshima, T. Kikuchi, M. Hatayama, H. Souma, S. Wada, and H. Tashiro, “Observation of dynamical interactions between σ- and π-electrons in organic molecules by resonant coherent-grating and coherent anti-stokes raman spectroscopy”, J. Lumin. 102-103, 189-193, (2003).