We demonstrate terahertz-wave (THz-wave) surface-emitted difference frequency generation with nanosecond pulse duration. A slant-stripe-type periodically poled lithium niobate (PPLN) crystal was used to realize the quasi-phase-matching in two mutually perpendicular directions of optical and THz-wave propagation. A THz-wave with a wavelength near 200 μm was generated by mixing the radiation of a dual-signal-wave optical parametric oscillator based on a periodically phase-reversed PPLN crystal.
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Sasaki et al. (2002) studied this question.
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