Abstract
A large unexamined second-order nonlinear optical (NLO) process is found in a 4-N,N-dimethylamino-4’-N’-methyl stilbazolium tosylate (DAST) crystal, which has a large figure of merit among NLO crystals. In second-order NLO processes using a DAST crystal, the ${\chi}_{111}^{(2)}$ process of light excitation is commonly used, involving a-axis polarized light excitation with light generation of a-axis polarized light. However, there have been few studies of other second-order NLO susceptibility processes to date. In this Letter, terahertz (THz) wave generation via second-order NLO processes based on the ${\chi}_{133}^{(2)}$ second-order NLO susceptibility of the DAST crystal was investigated. By adjusting the polarization direction of the excitation light using a prism-coupled Cerenkov phase-matching method, efficient generation of THz waves was achieved using a process involving ${\chi}_{133}^{(2)}$. The magnitude of the NLO constant ${\chi}_{133}^{(2)}$ estimated from the THz intensity ratio was 77.8 pm/V. These results indicate that prism-coupled Cherenkov phase matching can be used to identify undiscovered NLO processes for NLO crystals.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Kayla M. Holland, Aldair Alejandro, Daisy J. H. Ludlow, Paige K. Petersen, Melodie A. Wright, Caitlin C. Chartrand, David J. Michaelis, Jeremy A. Johnson, and James E. Patterson
Opt. Lett. 48(22) 5855-5858 (2023)
Harry Figi, Lukas Mutter, Christoph Hunziker, Mojca Jazbinšek, Peter Günter, and Benjamin J. Coe
J. Opt. Soc. Am. B 25(11) 1786-1793 (2008)
B. Monoszlai, C. Vicario, M. Jazbinsek, and C. P. Hauri
Opt. Lett. 38(23) 5106-5109 (2013)