Widely tunable terahertz (THz)-wave generation using difference frequency generation (DFG) in an organic N-benzyl-2-methyl-4-nitroaniline (BNA) crystal was demonstrated. To our knowledge, this is the first report of THz-wave generation by BNA DFG. Large, high-quality single crystals of BNA were grown using the vertical Bridgman method. The nonlinear optical (NLO) coefficient of the BNA crystal is , which is the largest value reported for any yellow NLO material. The collinear phase-matching condition of the type-0 configuration is satisfied using a band pump wavelength. We generated THz waves using an organic BNA crystal; the generation range is .
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