空气等离子体探测太赫兹超宽谱实验研究  

Experimental Study of Super-bBoadband Terahertz Coherent Detection with Air Plasma

作　　者：赫君[1] 牧凯军[2] 杨华[1] 侯德亭[1] 马胜灿[3] 石晓燕[1] 

机构地区：[1]信息工程大学理学院,河南郑州450001 [2]郑州大学物理工程学院,河南郑州450001 [3]南昌航空大学材料科学和工程学院,江西南昌330063

出　　处：《激光与光电子学进展》2013年第10期198-202,共5页Laser & Optoelectronics Progress

摘　　要：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。Super-broadband spectrum detection technology has an important significance for high-resolution terahertz （THz） absorption spectrum measurements, as well as scientific research and application of terahertz development. We use air plasma as the detection medium and successfully detect super-broadband THz spectra. The detection mechanism is investigated by experiments. We use the system to measure two kinds of explosives＇ super-broadband absorption spectra. The results indicate that THz spectra widths increase with pump power or bias, and super- broadband absorption spectra match well with Fourier transform infrared （FTIR） peetra in low frequency area.

关 键 词：光谱学 太赫兹 空气等离子体 相干探测 超宽谱 光谱测量 

分 类 号：O433.1[机械工程—光学工程]