Real-time terahertz imaging over a standoff distance (>25 meters)
Real-time terahertz imaging over a standoff distance (>25 meters)
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DOI：
10.1063/1.2360210
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发表时间：
2006-10-02
影响因子：
4
通讯作者：
Hu, Qing
中科院分区：
文献类型：
--
作者：
Lee, Alan W. M.;Qin, Qi;Hu, Qing
作者演示了使用太赫兹量子级联激光器(QCL)在25米距离的传输模式下进行实时成像。激光频率被选择为在类似于4.9太赫兹的大气窗口内的最佳传输。通过QCL增益介质的设计，进行了粗选频。通过合理选择激光腔长来调整小面损耗，从而调整激光阈值偏置，从而使斯塔克移位增益谱的峰值频率与大气窗口重叠，从而进行更精细的选择(至0.1太赫兹以内)。图像是使用非制冷320x240微测辐射热计相机显示的。(C)2006年美国物理研究所。
The authors demonstrate the use of a terahertz quantum cascade laser (QCL) for real-time imaging in transmission mode at a standoff distance of 25 meters. Lasing frequency was selected for optimum transmission within an atmospheric window at similar to 4.9 THz. Coarse frequency selection was made by design of the QCL gain medium. Finer selection (to within 0.1 THz) was made by judicious choice of laser cavity length to adjust facet losses and therefore lasing threshold bias, in order to overlap the peak frequency of the Stark-shifted gain spectrum with the atmospheric window. Images are shown using an uncooled 320x240 microbolometer camera. (c) 2006 American Institute of Physics.