Open AccessHighly nonlinear organic crystal OHQ-T for efficient ultra-broadband terahertz wave generation beyond 10 THz
Author(s) -
Bong Joo Kang,
In Hyung Baek,
Seung-Heon Lee,
Dong-Won Kim,
Seungjun Lee,
Young Uk Jeong,
OPil Kwon,
Fabıan Rotermund
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.011054
Subject(s) - terahertz radiation , optical rectification , optics , optoelectronics , phase matching , nonlinear optics , terahertz spectroscopy and technology , refractive index , crystal (programming language) , materials science , electric field , energy conversion efficiency , physics , laser , quantum mechanics , computer science , programming language
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.