The first known demonstration of tunable terahertz-wave generation by difference-frequency generation of dual signal-wave quasi-phase-matched optical parametric oscillation was performed with periodically poled (PPLN) with a series of gratings. An organic ionic salt, 4-dimethylamino--methyl-4-stilbazolium-tosylate (DAST), was used as a nonlinear crystal. A compact terahertz-wave source resulted, and changing the temperature of the PPLN permitted the wavelength to be varied from 120 to . The wavelength could be tuned from 100 to by proper selection of combinations of periodically poled gratings.
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