Widely tunable quantum cascade lasers for spectroscopic sensing
Widely tunable quantum cascade lasers for spectroscopic sensing
复制标题
用于光谱传感的宽可调量子级联激光器
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
H. Schenk
中科院分区：
文献类型：
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作者：
J. Wagner;R. Ostendorf;J. Grahmann;A. Merten;S. Hugger;J. Jarvis;F. Fuchs;D. Bošković;H. Schenk
本文报道了宽带可调谐中红外（MIR）外腔量子级联激光器（EC-QCL）技术的最新进展及其在光谱过程分析和危险物质（如爆炸物和相关前体）成像远距离探测中的应用。本文介绍了采用定制的Littrow结构的MOEMS扫描光栅作为波长选择性光反馈元件的快速扫描EC-QCL的初步结果。这样，实现了1 kHz的扫描速率，其对应于每秒2000次全波长扫描。此外，将提出基于EC-QCL的MIR光谱的示例性案例研究。这些技术包括对化学过程控制中的催化反应进行时间分辨分析，以及利用成像后向散射光谱技术检测相关环境中的爆炸物残留物和相关前体。
In this paper recent advances in broadband-tuneable mid-infrared (MIR) external-cavity quantum cascade lasers (EC-QCL) technology are reported as well as their use in spectroscopic process analysis and imaging stand-off detection of hazardous substances, such as explosive and related precursors. First results are presented on rapid scan EC-QCL, employing a custom-made MOEMS scanning grating in Littrow-configuration as wavelength-selective optical feedback element. This way, a scanning rate of 1 kHz was achieved, which corresponds to 2000 full wavelength scans per second. Furthermore, exemplary case studies of EC-QCL based MIR spectroscopy will be presented. These include timeresolved analysis of catalytic reactions in chemical process control, as well as imaging backscattering spectroscopy for the detection of residues of explosives and related precursors in a relevant environment.