Open AccessEfficient terahertz generation in highly nonlinear organic crystal HMB-TMS
Author(s) -
Jian Lu,
Seung-Heon Lee,
Xian Liang,
Seung−Chul Lee,
JaeHyun Han,
O.-J. Kown,
Keith A. Nelson
Publication year - 2018
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.26.030786
Subject(s) - terahertz radiation , optical rectification , femtosecond , materials science , optics , nonlinear optics , electric field , terahertz spectroscopy and technology , optoelectronics , energy conversion efficiency , second harmonic generation , laser , physics , quantum mechanics
We report on generation of strong and broadband terahertz (THz) pulses via collinearly phase-matched optical rectification of near-infrared femtosecond pulses in the organic nonlinear optical HMB-TMS (2-(4-hydroxy-3-methoxystyryl)-3-methylbenzo[d]thiazol-3-ium 2,4,6-trimethylbenzenesulfonate) single crystals which exhibit optimal molecular orientation and large macroscopic optical nonlinearity for efficient THz wave generation. Single-cycle THz pulses with a peak electric field strength of 0.66 MV/cm and a bandwidth from 0.1 to 5.4 THz are achieved from an HMB-TMS crystal with only a 2-mm clear aperture pumped by 1350 nm pulses at moderate fluences. The generated THz energy is about 1 µJ and the corresponding pump-to-THz energy conversion efficiency reaches 0.23%.