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13 March 2012 The scheme of efficient terahertz difference frequency generation in two-dimensional periodical crystals by CO2 laser
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Abstract
This paper reports the scheme of terahertz (THz) wave generation on the basis of difference frequency generation in two-dimensional periodically structural Crystals pumped by CO2 laser. The two orthogonal periodic structures individually compensate for both the phase mismatch of the launched lasers and the generated THz wave. Quasi phase matching (QPM) was designed to satisfy the wave vector phase matching condition in two-dimensional periodical GaAs crystals. The parallel to the direction of the pump wave propagation grating period Λ1 and perpendicular to the direction of the pump wave propagation grating period Λ2 of two-dimensional periodical GaAs crystals at the 100-1000μm (0.3-3THz) range are investigated. The length of the parallel to the direction of the pump wave propagation grating period is 90.17 μm and the length of the perpendicular to the direction of the pump wave propagation grating period is 83.69μm in the two-dimensional collinear QPM scheme to generate a frequency of 1 THz wave pumped by CO2 laser. The result shown that the scheme of phase matching applies two-dimensional collinear quasi phase matching (QPM) is efficient to obtain high power conversion efficiency of THz wave.
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Zhiming Rao, Tao Wu, Yan He, Qing Ye, Keyun Xiong, and Li Zhou "The scheme of efficient terahertz difference frequency generation in two-dimensional periodical crystals by CO2 laser", Proc. SPIE 8330, Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology, 83300Q (13 March 2012); https://doi.org/10.1117/12.918388
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