Open AccessTheoretical research on cascaded difference frequency generation of terahertz radiation
Author(s) -
Kai Zhong,
Jianquan Yao,
Degang Xu,
Huiyun Zhang,
Peng Wang
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.034210
Subject(s) - terahertz radiation , physics , crystal (programming language) , energy conversion efficiency , optics , limit (mathematics) , photon , coupling (piping) , absorption (acoustics) , optoelectronics , materials science , computer science , mathematical analysis , mathematics , metallurgy , programming language
A novel mechanism of cascaded difference frequency generation (DFG) is advanced in this article to solve the problem of low-efficiency in terahertz (THz) DFG. The cascaded DFG process is theoretically analyzed using ZnTe crystal as an example. The optimal pumping condition and crystal length is obtained, and the effects of crystal absorption, wave number mis-match and pumping intensity are investigated by solving the coupling wave equations of cascaded DFG. It is obviously seen from the calculation results that the terahertz conversion efficiency can be greatly enhanced in cascaded DFG, in which the photon conversion efficiency can even break through the Manley-Rowe limit.