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The two stilbazolium derivatives, 4-dimethylamino- N -methyl-4-stilbazolium tosylate (DAST) and 4-dimethylamino- N -methyl-4-stilbazolium p -chlorobenzenesulfonate (DASC), are organic ionic nonlinear optical materials that have a tendency to form bulk crystals when grown in a mixed solvent of methanol and acetonitrile. We observed the generation of broadband high-power terahertz (THz) waves from the bulk crystals of DASC. DASC crystals have superior transmission characteristics in the THz band than DAST crystals, and it is expected that the THz waves generated using DASC crystals will have higher power than those generated using DAST crystals.
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Matsukawa et al. (2010) studied this question.
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