Intensity-Stabilized Fast-Scanned Direct Absorption Spectroscopy Instrumentation Based on a Distributed Feedback Laser with Detection Sensitivity down to 4 x 10(-6)
2016 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 16, no 9, 1544Article in journal (Refereed) Published
A novel, intensity-stabilized, fast-scanned, direct absorption spectroscopy (IS-FS-DAS) instrumentation, based on a distributed feedback (DFB) diode laser, is developed. A fiber-coupled polarization rotator and a fiber-coupled polarizer are used to stabilize the intensity of the laser, which significantly reduces its relative intensity noise (RIN). The influence of white noise is reduced by fast scanning over the spectral feature (at 1 kHz), followed by averaging. By combining these two noise-reducing techniques, it is demonstrated that direct absorption spectroscopy (DAS) can be swiftly performed down to a limit of detection (LOD) (1 sigma) of 4 x 10(-6), which opens up a number of new applications.
Place, publisher, year, edition, pages
2016. Vol. 16, no 9, 1544
direct absorption spectroscopy, DFB laser, intensity stabilization, fast scanning, relative intensity noise, polarization rotator
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:umu:diva-127635DOI: 10.3390/s16091544ISI: 000385527700199OAI: oai:DiVA.org:umu-127635DiVA: diva2:1050784