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中文摘要：
从大孔径光电导天线产生THz辐射的饱和理论出发，考虑了载流子的瞬变迁移率．分析了脉冲序列激发Joel径光电导天线产生高功率窄带宽THz辐射的特性．对比了单个光脉7中和序列光脉冲激发SI-GaAs和LT-GaAs光电导天线的饱和特性．分析表明，采用序列光脉冲激发载流子寿命小于光脉冲间隔的光电导天线时，可以克服大孔径光电导天线的饱和特性，产生高峰值功率的窄带THz辐射．
英文摘要：
High-power narrow-band terahertz （THz） radiations emitted from a biased large-aperture photoconductive antenna triggered by multiple-pulse trains is studied. The effects of the finite lifetime and transient mobility dynamics of photogenerated carriers in the analysis are included. THz waveforms are calculated from the saturation theory of large-aperture photoconductive antennas, and comparisons are made between single-pulse and multiple-pulse satruation proterties of THz emission from SI-GaAs and LT- GaAs emitters. The results show that the saturation at high fluence density with the interpulse spacing longer than the carrier lifetime can be avoided by mulitiple-pulse trains excitation large-aperture photoconductive emitters.
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