Riken Corporation

Koda Kawase

Hiromasa Ito

Jun-ichi Shikata

A THz-wave generator according to the present invention includes a nonlinear optical crystal capable of parametric generation, a first laser device for injecting a single-frequency first laser beam as a pump wave into the nonlinear optical crystal, and a second laser device for injecting a different single-frequency second laser beam to thereby injection-seed a second laser beam in a direction in which an idler wave is generated by the pump wave. By this configuration, it is possible, in generation of a THz-wave by use of the parametric effect in the nonlinear optical crystal under a non-collinear phase matching condition, to greatly increase a power of the THz-wave, to narrow its spectrum width, to make variable the wavelength of a generated THz-wave, and to hold its generation direction almost constant.

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Miyagi, Japan

Koda Kawase