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.