© 2017 The Japan Society of Applied Physics. We developed a widely tunable terahertz (THz)-wave source covering the sub-THz frequency by difference frequency generation using a 4-dimethylamino-N-methyl-4-stibazolium tosylate (DAST) crystal. Near-infrared waves generated by dual-wavelength injection-seeded β-BaB2O4 optical parametric generation (is-BBO-OPG) were used for pumping the DAST crystal, which had separated wavelengths in the spectrum with a difference frequency of sub-THz. Furthermore, the non-collinear phase-matching condition was designed to compensate the walk-off effect of the BBO crystal. Consequently, tunable THz-waves from 0.3 to 4 THz were generated by tuning the wavelength of one of the seeding beams. The generated sub-THz-waves were monochromatic (d < 33GHz) with a maximum energy of 80 pJ at 0.65 THz.
Tokizane, Y., Nawata, K., Han, Z., Koyama, M., Notake, T., Takida, Y., & Minamide, H. (2017). Tunable terahertz waves from 4-dimethylamino-N’-methyl-4’-stibazolium tosylate pumped with dual-wavelength injection-seeded optical parametric generation. Applied Physics Express, 10(2). https://doi.org/10.7567/APEX.10.022101