title: Optimized terahertz-wave generation using BNA-DFG.
abstract: An effective and widely tunable means of producing terahertz (THz) radiation using difference-frequency generation (DFG) in an organic N-benzyl-2-methyl-4-nitroaniline (BNA) crystal was demonstrated by optimizing the pump wavelengths. We calculated the (wideband) refractive index and coherence length mapping of BNA to establish the optimum phase-matching condition of the DFG configuration. To satisfy the phase-matching conditions over the range 0.1-20 THz, both pump wavelengths were varied from 780 to 950 nm, and the optical wavelength dependency of the THz-wave output was clearly observed. We expanded the range of THz-wave generation and increased the power output to ten times that obtained using previous methods.
authors.affiliation: Tera-photonics laboratory, RIKEN Sendai, 519-1399, Aramaki-aoba, Aoba-ku, Sendai, Miyagi 980-0845, Japan. k-miyamoto@faculty.chiba-u.jp
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Miyamoto
authors.forename: Seigo
authors.initials: S
authors.lastname: Ohno
authors.forename: Masazumi
authors.initials: M
authors.lastname: Fujiwara
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Minamide
authors.forename: Hideki
authors.initials: H
authors.lastname: Hashimoto
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Ito
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D003460:Crystallization; D003952:Diagnostic Imaging / Q000295:instrumentation; D004867:Equipment Design; D007834:Lasers; D055096:Optical Devices; D055100:Optical Fibers; D055095:Optics and Photonics; D009930:Organic Chemicals; D009991:Oscillometry / Q000379:methods; D012031:Refractometry; D013055:Spectrophotometry, Infrared / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D055068:Terahertz Spectroscopy / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D009930:Organic Chemicals; C008625:nitroaniline