A sensitive spectroscopic sensor based on a hollow-core fiber-coupled quantum
cascade laser (QCL) emitting at
10.54 μm and quartz enhanced photoacoustic spectroscopy (QEPAS)
technique is reported. The design and
realization of mid-IR fiber and
coupler optics has ensured single-mode QCL beam delivery to the QEPAS sensor.
The collimation optics was designed to produce a laser beam of significantly
reduced beam size and waist so as to prevent illumination of the quartz tuning
fork and microresonator tubes.
© 2012 Optical Society of America
Remote Sensing and Sensors
Original Manuscript: August 28, 2012
Revised Manuscript: September 19, 2012
Manuscript Accepted: September 21, 2012
Published: October 23, 2012
Vincenzo Spagnolo, Pietro Patimisco, Simone Borri, Gaetano Scamarcio, Bruce E. Bernacki, and Jason Kriesel, "Part-per-trillion level SF6 detection using a quartz enhanced photoacoustic spectroscopy-based sensor with single-mode fiber-coupled quantum cascade laser excitation," Opt. Lett. 37, 4461-4463 (2012)