太赫兹波光谱特性分析

目前太赫兹技术的研究主要集中在它的产生、探测机理研究上。由于太赫兹波处于微波和可见光之间的频率范围,已有的微波和光波理论是否能适用于太赫兹波或者具有某些共同的特性仍需实验验证。通过实验分析验证了太赫兹波在空气介质中在垂直于传播方向的平面内场振幅是服从高斯函数分布的,测量给出了太赫兹波的能量分布图。根据测试数据推导出太赫兹波在空气介质中能量衰减公式,利用法布里-珀罗(F-P)干涉仪原理设计出太赫兹波长仪,对美国Corehent公司SIFIR-50THz太赫兹激光器发射的1～3THz波长进行了测量。讨论分析了远场发射角、光束入射角度、机械振动、温度波动和折射率n波动等相关因素对测量精度的影响。

Analysis of the Spectral Characters of Terahertz-Wave

At present, terahertz technology research mainly concentrates in its generation and detection mechanism. As the terahertz-wave being in the frequency range between microwave and visible light, whether the microwave and optical theory is applicable to terahertz-wave or has some common characteristic is to be studied. Analyzing and verifing the terahertz-wave field amplitude obeys the Gaussian distribution in the receiving plane perpendicular to the direction of propagation in the air medium by experiment; measurement brings forward energy distribution chart of terahertz wave in the air medium; the energy attenuation formulas of terahertz wave is deduced on the basis of the experimental data; the terahertz wavelength apparatus is designed using the Fabry-Perot (F-P) interferometer theory; the wavelength of emitted wave between 1~3 THz is measured from the SIFIR-50 THz laser of American Corehent Company. The related factors affecting the measurement precision including far-field divergence angle, the beam incident angle, mechanical vibration, temperature fluctuation and the refractive index fluctuation is analyzed at last.