摘要
A new scheme which generates multi-frequency terahertz(THz)waves from planar waveguide by the optimized cascaded difference frequency generation(OCDFG)is proposed.A THz wave with frequencyω_(T1)is generated by the OCDFG with two infrared pump waves,and simultaneously a series of cascaded optical waves with a frequency intervalω_(T1)is generated.The THz wave with a frequency of M-timesω_(T1)is generated by mixing the m-th-order and the(m+M)-th-order cascaded optical wave.The phase mismatch distributions of cascaded difference frequency generation(CDFG)are modulated by changing the thickness of planar waveguide step by step,thereby satisfying the phase-matching condition from first-order to high-order cascaded Stokes process step by step.As a result,the intensity of THz wave can be enhanced and modulated by controlling the cascading order of OCDFG.
作者
李忠洋
赵佳
袁胜
焦彬哲
陈治良
张红涛
邴丕彬
谭联
姚建铨
Zhong-Yang Li;Jia Zhao;Sheng Yuan;Bin-Zhe Jiao;Pi-Bin Bing;Hong-Tao Zhang;Zhi-Liang Chen;Lian Tan;Jian-Quan Yao(College of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;College of Precision Instrument and Opto-electronics Engineering,Institute of Laser and Opto-electronics,Tianjin University,Tianjin 300072,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.61735010,31671580,and 61601183)
the Natural Science Foundation of Henan Province,China(Grant No.162300410190)
the Program for Science&Technology Innovation Talents in Universities of Henan Province,China(Grant No.18HASTIT023)。