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在众多实现太赫兹辐射的方法中,非线性光学共线差频能够实现高功率、宽波段、连续可调谐的太赫兹波辐射.理论分析表明,各向同性磷化镓晶体,在1064nm附近波长激光共线差频下具有毫米量级的相干长度,能够满足高功率宽波段的太赫兹辐射条件.实验证明,磷化镓晶体共线差频实现高功率宽波段的太赫兹光辐射,其太赫兹光波长调谐范围为95.9—773.4μm(0.39—3.13THz),最高峰值功率7W位于频率2.0THz处.该实验结果与理论计算基本保持一致.
Among the many methods of achieving terahertz radiation, the nonlinear optical colinear difference frequency can achieve high power, wideband and continuously tunable terahertz wave radiation.Theoretical analysis shows that the isotropic gallium arsenide crystal has a wavelength near 1064nm Laser coherence difference frequency has a coherence length on the order of millimeter, which can meet the terahertz radiation conditions of high power and wide wavelength band. Experiments show that the colinearity difference frequency of gallium phosphide crystal achieves terahertz radiation with high power and wide band, Hertz wavelength tuning range of 95.9-773.4μm (0.39-3.13THz), the maximum peak power of 7W at a frequency of 2.0THz at the experimental results and the theoretical calculations are basically the same.