Jian Lu,1 Harold Y. Hwang,1 Xian Li,1 Seung-Heon Lee,2 O-Pil
Kwon2 and Keith A. Nelson1,*
1 Deartment of
Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts
02139, USA 2 Department of Molecular Science and Technology, Ajou University,
Suwon 443-749, South Korea * kanelson@mit.edu
Abstract: We report on the generation of continuously
tunable multi-cycle THz pulses with center frequencies from 0.3 to 0.8 THz in
the organic nonlinear crystal, HMQ-TMS [2-(4-hydroxy-3-methoxystyryl)-1-
methylquinolinium 2,-4,-6-trimethylbenzenesulfonate], by collinearly phase
matched optical rectification of temporally shaped 800 nm pulses. The generation
of harmonic frequency components inherent in the pulse shaper is selectively
suppressed by varying the generation crystal thickness. THz pulses generated
from HMQ-TMS show up to 20 times higher pulse energies compared to the
benchmark inorganic THz generator ZnTe under identical conditions. The THz
energy conversion efficiencies are measured to be on the order of 10−5 .
©2015 Optical Society of America OCIS codes: (160.4890)
Organic materials; (190.0190) Nonlinear optics; (300.6495) Spectroscopy, terahertz.
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