Shin’ichiro Hayashi,1,2* Kouji Nawata,2 Kodo Kawase,3 Hiroaki Minamide2
1NICT, 4-2-1, Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan
2RIKEN Center for Advanced Photonics, 519-1399 Aramakiaoba, Aoba, Sendai, 980-0845, Japan
3Graduate School of Engineering, Nagoya University, Furocho, Chikusa, Nagoya, 464-8603, Japan
Nano-Micro Conference, 2017, 1, 01014
Published Online: 07 October 2017 (Abstract)
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Over the past decade, there has been remarkable growth in the field of terahertz frequency science and engineering, which has become a vibrant, international, cross-disciplinary research activity. Wavelength conversion in nonlinear optical materials is an effective method for generating and detecting coherent terahertz waves owing to the high conversion efficiency, bandwidth, wide tunability, and room-temperature operation, and if the tuning range and the peak power can be enhanced, drastic developments in basic researches and industrial applications can be expected.

Here we demonstrate the generation of high-brightness terahertz waves using parametric wavelength conversion in a nonlinear MgO doped LiNbO3 crystal. We revealed novel parametric wavelength conversion process using stimulated Raman scattering in MgO:LiNbO3 without stimulated Brillouin scattering using recently-developed microchip Nd:YAG laser. We also demonstrated the coherent detection of generated terahertz waves using nonlinear up-conversion.

A number of applications require high brightness, that is, intense and narrowband, terahertz waves such as observing multi-photon absorption to specific excitation states. We speculate that the high-brightness terahertz wave and its visualization could be powerful tools not only for solving real world problems but also fundamental physics. We expect that these methods will open up new fields and tune up killer applications.


The authors would like to thank Prof. T. Taira of IMS, Dr. Sakai of Hamamatsu Photonics, all of previous and present team members, Prof. H. Ito of RIKEN and Prof. M. Kumano of Tohoku University for useful discussions. This work was partially supported by Collaborative Research Based on Industrial Demand of the Japan Science and Technology Agency (JST), and JSPS KAKENHI Grant Numbers 25220606, 25286075, and ImPACT Program of Council for Science, Technology and Innovation.

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