Intensity-Stabilized Fast-Scanned Direct Absorption Spectroscopy Instrumentation Based on a Distributed Feedback Laser with Detection Sensitivity down to 4 × 10(−6)

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 signifi...

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Detalles Bibliográficos
Autores principales: Zhao, Gang, Tan, Wei, Jia, Mengyuan, Hou, Jiajuan, Ma, Weiguang, Dong, Lei, Zhang, Lei, Feng, Xiaoxia, Wu, Xuechun, Yin, Wangbao, Xiao, Liantuan, Axner, Ove, Jia, Suotang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5038816/
https://www.ncbi.nlm.nih.gov/pubmed/27657082
http://dx.doi.org/10.3390/s16091544
Descripción
Sumario: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) (1σ) of 4 × 10(−6), which opens up a number of new applications.

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