title: Tunable narrow band difference frequency THz wave generation in DAST via dual seed PPLN OPG.
abstract: We report a widely tunable narrowband terahertz (THz) source via difference frequency generation (DFG). A narrowband THz source uses the output of dual seeded periodically poled lithium niobate (PPLN) optical parametric generators (OPG) combined in the nonlinear crystal 4-dimthylamino-N-methyl-4-stilbazolium-tosylate (DAST). We demonstrate a seamlessly tunable THZ output that tunes from 1.5 THz to 27 THz with a minimum bandwidth of 3.1 GHz. The effects of dispersive phase matching, two-photon absorption, and polarization were examined and compared to a power emission model that consisted of the current accepted parameters of DAST.
authors.forename: Brian
authors.initials: B
authors.lastname: Dolasinski
authors.forename: Peter E
authors.initials: PE
authors.lastname: Powers
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Haus
authors.forename: Adam
authors.initials: A
authors.lastname: Cooney