Mid-infrared fiber-coupled QCL-QEPAS sensor

被引：72
|
作者：
Spagnolo, Vincenzo [1 ,2 ]
Patimisco, Pietro [1 ,2 ]
Borri, Simone [1 ,2 ]
Scamarcio, Gaetano [1 ,2 ]
Bernacki, Bruce E. [3 ]
Kriesel, Jason [4 ]
机构：
[1] Univ Bari, Dipartimento Interateneo Fis, Bari, Italy
[2] Politecn Bari, CNR IFN UOS BARI, Bari, Italy
[3] Pacific NW Natl Lab, Richland, WA 99352 USA
[4] Optoknowledge Syst Inc, Torrance, CA USA
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2013年 / 112卷 / 01期
关键词：
ENHANCED PHOTOACOUSTIC-SPECTROSCOPY; QUANTUM CASCADE LASERS;
D O I：
10.1007/s00340-013-5388-3
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An innovative spectroscopic system based on an external cavity quantum cascade laser (EC-QCL) coupled with a mid-infrared (mid-IR) fiber and quartz enhanced photoacoustic spectroscopy (QEPAS) is described. SF6 has been selected as a target gas in demonstration of the system for trace gas sensing. Single mode laser delivery through the prongs of the quartz tuning fork has been obtained employing a hollow waveguide fiber with inner silver-silver iodine (Ag-AgI) coatings and internal core diameter of 300 mu m. A detailed design and realization of the QCL fiber coupling and output collimator system allowed almost practically all (99.4 %) of the laser beam to be transmitted through the spectrophone module. The achieved sensitivity of the system is 50 parts per trillion in 1 s, corresponding to a record for QEPAS normalized noise-equivalent absorption of 2.7 x 10(-10) W cm(-1) Hz(-1/2).
引用
收藏
页码：25 / 33
页数：9
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