Cascaded DFG via quasi-phase matching with Cherenkov-type PPLN for highly efficient terahertz generation | Zendy

Juntao Huang | Zendy; Zhiming Rao | Zendy; Fangsen Xie | Zendy

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Cascaded DFG via quasi-phase matching with Cherenkov-type PPLN for highly efficient terahertz generation

Author(s) -

Juntao Huang,

Zhiming Rao,

Fangsen 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 , physics , phase matching , optoelectronics , 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.

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