Waveguide Structures for Generation of Terahertz Radiation by Electro-optical Process in GaAs and ZnGeP2 Using 1.55 μm Fiber Laser Pulses
By discussing the basic schemes of the terahertz generation methods based on the 1550-nm ultrafast lasers briefly, GaAs and ZnGeP2 are likely to be promising nonlinear optical crystals for terahertz waves generation by using optical rectification process. However, the mismatches of velocities between the terahertz waves and optical pulses are so large that the phase-matching coherent lengths are quite short, for example, the coherent length of 0.7mm for GaAs and 0.5mm for ZnGeP2 at 2 THz around, respectively. That limited extremely the applications of these bulk excellent nonlinear optical crystals in terahertz regime. In this paper, we demonstrated theoretically that the dielectric planar waveguide could be used to enhance the coherent length of optical rectification process in THz regime. And for the first time, a dielectric planar THz waveguide that has potential applicable value in THz generation by optical rectification method was proposed. We predicted that the effective coherent length could be extended to 4mm at 2 THz in a GaAs/ZnGeP2 dielectric planar waveguide during optical rectification process pumped by ultrafast optical pulses at wavelength of 1550 nm.
T.Yang S.Song H.Dong R.Ba
College of Precision Instruments and Opto-electronics Engineering Laboratory of Optoelectronics Information Technical Science,Educational Ministry of China Center for Terahertz Waves,Tianjin University,China
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-5
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）