title: Highly nonlinear organic crystal OHQ-T for efficient ultra-broadband terahertz wave generation beyond 10 THz.
abstract: We report on efficient generation of ultra-broadband terahertz (THz) waves via optical rectification in a novel nonlinear organic crystal with acentric core structure, i.e. 2-(4-hydroxystyryl)-1-methylquinolinium 4-methylbenzenesulfonate (OHQ-T), which possesses an ideal molecular structure leading to a maximized nonlinear optical response for near-infrared-pumped THz wave generation. By systematic studies on wavelength-dependent phase-matching conditions in OHQ-T crystals of different thicknesses we are able to generate coherent THz waves with a high peak-to-peak electric field amplitude of up to 650 kV/cm and an upper cut-off frequency beyond 10 THz. High optical-to-THz conversion efficiency of 0.31% is achieved by efficient index matching with a selective pumping at 1300 nm.
authors.forename: Bong Joo
authors.initials: BJ
authors.lastname: Kang
authors.forename: In Hyung
authors.initials: IH
authors.lastname: Baek
authors.forename: Seung-Heon
authors.initials: SH
authors.lastname: Lee
authors.forename: Won Tae
authors.initials: WT
authors.lastname: Kim
authors.forename: Seung-Jun
authors.initials: SJ
authors.lastname: Lee
authors.forename: Young Uk
authors.initials: YU
authors.lastname: Jeong
authors.forename: O-Pil
authors.initials: OP
authors.lastname: Kwon
authors.forename: Fabian
authors.initials: F
authors.lastname: Rotermund