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Research Paper

Journal of the Optical Society of Korea 2015; 19(3): 297-302

Published online June 25, 2015 https://doi.org/10.3807/JOSK.2015.19.3.297

Copyright © Optical Society of Korea.

Investigation of Terahertz Generation from Bulk and Periodically Poled LiTaO3 Crystal with a Cherenkov Phase Matching Scheme

Zhongyang Li1, Pibin Bing1, Sheng Yuan1, Degang Xu2, and Jianquan Yao2

1North China University of Water Resources and Electric Power; 2College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University

Received: January 27, 2015; Revised: April 9, 2015; Accepted: April 10, 2015


Terahertz (THz) wave generation from bulk and periodically poled $LiTaO_3$ (PPLT) with a Cherenkov phase matching scheme is numerically investigated. It is shown that by using the crystal birefringence of bulk $LiTaO_3$ and a grating vector of PPLT, THz waves can be efficiently generated by difference frequency generation (DFG) with a Cherenkov phase matching scheme. The frequency tuning characteristics of the THz wave via varying wavelength of difference frequency waves, phase matching angle, poling period of PPLT and working temperature are theoretically analyzed. The parametric gain coefficient in the low-loss limit and the absorption coefficient of the THz wave during the DFG process in the vicinity of polariton resonances are numerically analyzed. A THz wave can be efficiently generated by utilizing the giant second order nonlinearities of $LiTaO_3$ in the vicinity of polariton resonances.

Keywords: Terahertz wave, Difference frequency generation, Cherenkov phase matching,

OCIS codes: 190.4410; 140.3070