Theoretical research on terahertz wave generation from planar waveguide by optimized cascaded difference frequency generation |
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| Authors: | Zhongyang Li Jia Zhao Wenkai Liu Qingfeng Hu Yongjun Li Binzhe Jiao Pibin Bing Hongtao Zhang Lian Tan Jianquan Yao |
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| Affiliation: | (College of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;College of Surveying and Geo-informatics,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) |
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| Abstract: | A novel scheme for high-efficiency terahertz(THz) wave generation based on optimized cascaded difference frequency generation(OCDFG) with planar waveguide is presented. The phase mismatches of each-order cascaded difference frequency generation(CDFG) are modulated by changing the thickness of the waveguide, resulting in a decrement of phase mismatches in cascaded Stokes processes and an increment of phase mismatches in cascaded anti-Stokes processes simultaneously. The modulated phase mismatches enhance the cascaded Stokes processes and suppress the cascaded anti-Stokes processes simultaneously, yielding energy conversion efficiencies over 25% from optical wave to THz wave at 100 K. |
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