Bayesian framework for THz-TDS plasma diagnostics

Terahertz time-domain spectroscopy (THz-TDS) is an optical diagnostic used to noninvasively measure plasma electron density and collision frequency. Conventional methods for analyzing THz-TDS plasma diagnostic data often do not account for measurement artifacts and do not quantify parameter uncertai...

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Bibliographic Details
Published in:Optics express 2021-02, Vol.29 (4), p.4887-4901
Main Authors: Brown, Nathan P, Grauer, Samuel J, Deibel, Jason A, Walker, Mitchell L R, Steinberg, Adam M
Format: Article
Language:English
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Summary:Terahertz time-domain spectroscopy (THz-TDS) is an optical diagnostic used to noninvasively measure plasma electron density and collision frequency. Conventional methods for analyzing THz-TDS plasma diagnostic data often do not account for measurement artifacts and do not quantify parameter uncertainties. We introduce a novel Bayesian framework that overcomes these deficiencies. The framework enables computation of both the density and collision frequency, compensates for artifacts produced by refraction and delay line errors, and quantifies parameter uncertainties caused by noise and imprecise knowledge of unmeasured plasma properties. We demonstrate the framework with sample measurements of a radio frequency inductively-coupled plasma discharge.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.417396