Open AccessHeterodyne phase-sensitive detection for calibration-free molecular dispersion spectroscopy
Author(s) -
Pedro MartínMateos,
Pablo Acedo
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.015143
Subject(s) - optics , heterodyne (poetry) , heterodyne detection , calibration , dispersion (optics) , spectroscopy , materials science , phase (matter) , molecular spectroscopy , physics , laser , quantum mechanics , acoustics
In this paper, a technique for molecular dispersion spectroscopy based on heterodyne phase-sensitive detection is presented. The method offers immunity to fluctuations of the received optical power and an output linearly dependent of the gas concentration. Besides this, an analytical model for the propagation of light in gaseous samples has been developed enabling calibration-free operation. The proposed architecture has been tested and experimentally validated using methane as target gas.