周期结构GaAs晶体ps脉冲差频产生窄带THz辐射的研究

计算模拟了在ps脉冲抽运周期结构GaAs晶体差频产生窄带THz波过程中，对于不同波长、不同脉宽的抽运光，周期结构GaAs晶体的走离长度和最佳周期长度的变化，并对计算结果进行了理论分析.研究了周期结构GaAs晶体的畴数对THz波光谱的影响.根据GaAs晶体温度色散公式，计算并分析了晶体最佳周期长度的温度调谐特性，研究了温度变化对THz波光谱的影响，提出了通过温度调谐实现在周期结构GaAs晶体中产生宽调谐、窄带宽THz波的新方法，该计算结果为下一步的实验研究提供了理论基础. 关键词： ps脉冲 差频产生窄带THz波 周期结构GaAs晶体 温度调谐

The study of narrow-band terahertz-wave generation by difference frequency mixing in periodical-inverted GaAs crystal with ps pump pulses

In this paper, the tuning of walk-off length and the optimal period of periodical-inverted GaAs crystal in narrow-band terahertz-wave generation by difference frequency mixing was numerical simulated and analyzed in the condition of different wavelengths and durations of pump pulse.The influence of the number of domains of periodically-inverted GaAs crystal on the THz-wave spectrum was also studied.The temperature tuning properties in periodical-inverted GaAs crystal were calculated and analyzed with the temperature dependent Sellmeier function of GaAs crystal; the influence of temperature tuning on the THz-wave spectrum was also studied.The simulation showed a new way to generate the wide-tunable narrow-band THz wave with temperature tuning.These theoretical calculations served for the subsequent experiment as theoretical basis and reference.