Large optical depth frequency modulation spectroscopy

Band-resolved frequency modulation spectroscopy is a common method to measure weak signals of radiative ensembles. When the optical depth of the medium is large, the signal drops exponentially and the technique becomes ineffective. In this situation, we show that a signal can be recovered when a lar...

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Bibliographic Details
Published in:arXiv.org 2019-10
Main Authors: Chang, Chi Kwong, Chan, Eng Aik, Syed Abdullah Aljunid, Shakhmuratov, Rustem, Wilkowski, David
Format: Article
Language:English
Subjects:
Cesium
Cesium vapor
Frequency modulation
Line broadening
Meteorological satellites
Sensitivity
Spectrum analysis
Online Access:Get full text
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Summary:Band-resolved frequency modulation spectroscopy is a common method to measure weak signals of radiative ensembles. When the optical depth of the medium is large, the signal drops exponentially and the technique becomes ineffective. In this situation, we show that a signal can be recovered when a larger modulation index is applied. Noticeably, this signal can be dominated by the natural linewidth of the resonance, regardless of the presence of inhomogeneous line broadening. We implement this technique on a cesium vapor, and then explore its main spectroscopic features. This work opens the road towards measurement of cooperative emission effects in bulk atomic ensemble.
ISSN:2331-8422
DOI:10.48550/arxiv.1902.06926