Mid-infrared fiber-coupled QCL-QEPAS sensor

被引：73

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

页码：25 / 33

页数：9

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