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超宽谱探测技术对于高分辨率的太赫兹吸收光谱测量以及太赫兹科学研究和应用发展等方面具有重要意义。利用空气等离子体实现了太赫兹超宽谱的测量,并对该探测机制进行了系统的实验研究,利用该探测系统测量了两种炸药奥克托金(HMX)和太胺(PETN)的太赫兹超宽带吸收谱。结果表明太赫兹频谱宽度会随着探测光能量或偏置电场的增加而展宽,随着探测脉冲脉宽的增大而变窄,且利用空气等离子体产生与探测的超宽谱测量在低频区与傅里叶变换红外(FTIR)光谱术有很好的吻合。
Ultra-wideband detection technology is of great significance for high-resolution terahertz absorption spectroscopy measurement and terahertz science research and application development. The measurement of terahertz ultra-wide spectrum was realized by using air plasma, and the mechanism of the detection was systematically studied. By using this detection system, the two explosives, HMX and PETN, were measured too Hertz Ultra-wideband absorption spectrum. The results show that the width of the terahertz spectrum will broaden with the increase of the probe light energy or the bias electric field and narrow with the increase of the pulse width of the probe pulse, and the wide-band measurement of the air plasma generated and detected in the low frequency region And Fourier transform infrared (FTIR) spectroscopy has a good match.