Abstract-Investigation on Terahertz Generation by GaP Ridge Waveguide Based on Cascaded Difference Frequency Generation

Li  Zhongyang,  Zhong, Kai,  Bing Pibin, Yuan Sheng, Xu Degang, Yao  Jianquan

http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=E1OSAB_2016_v20n1_169

Terahertz (THz) generation by a GaP ridge waveguide with a collinear modal phase-matching scheme based on cascaded difference frequency generation (DFG) processes is theoretically analyzed. The cascaded Stokes interaction processes and the cascaded anti-Stokes interaction processes are investigated from coupled wave equations. THz intensities and quantum conversion efficiency are calculated. Compared with non-cascaded DFG processes, THz intensities from 11-order cascaded DFG processes are increased to 5.48. The quantum conversion efficiency of 177.9% in cascaded processes can be realized, exceeding the Manley-Rowe limit.