Open AccessCascaded DFG via quasi-phase matching with Cherenkov-type PPLN for highly efficient terahertz generation
Author(s) -
Juntao Huang,
Zhiming Rao,
Fei Xie
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.017199
Subject(s) - cherenkov radiation , terahertz radiation , lithium niobate , optics , energy conversion efficiency , photon , quasi phase matching , optoelectronics , physics , phase matching , nonlinear optics , materials science , laser , detector
Terahertz (THz) generation in a periodically poled lithium niobate crystal via cascaded difference-frequency generation based on Cherenkov-type quasi-phase matching (QPM) is proposed. Photon conversion efficiency is evaluated based on a promising structure that combines QPM and Cherenkov phase-matching with reduced wave-vector mismatch. Cascading processes contribute to photon conversion efficiency, and THz radiation with maximum photon conversion efficiency of 1154.2% in a 14-order cascaded Stokes process was obtained. Comparing the processes with and without Cherenkov-type radiation, with a 50-MW pump, power was boosted nearly 1.9 times for the former case. These results provide an experimental approach to high-energy THz-wave generation.