Real-time terahertz imaging over a standoff distance (>25 meters)

被引：239

作者：

Lee, Alan W. M.

Qin, Qi

Kumar, Sushil

Williams, Benjamin S.

Hu, Qing

机构：

[1] MIT, Dept Elect Engn & Comp Sci, Elect Res Lab, Cambridge, MA 02139 USA

[2] Sandia Natl Labs, Dept 1123, Albuquerque, NM 87185 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 14期

基金：

美国国家航空航天局; 美国国家科学基金会; 美国能源部;

关键词：

D O I：

10.1063/1.2360210

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：3

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Real-time terahertz imaging over a standoff distance (&gt;25 meters)

Real-time terahertz imaging over a standoff distance (>25 meters)