Measurement of the transmission of the atmosphere from 0.2 to 2 THz

The attenuation of electromagnetic wave propagation in the clear atmosphere from low frequencies up to 2 THz is mainly caused by water vapor. Although there have been many numerical simulations and excellent early sub-mm and far-infrared measurements of this attenuation, there has remained controver...

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Bibliographic Details
Published in:Optics express 2011-04, Vol.19 (9), p.8830-8838
Main Authors: Yang, Yihong, Shutler, Alisha, Grischkowsky, D
Format: Article
Language:English
Subjects:
Atmosphere - analysis
Atmosphere - chemistry
Environmental Monitoring - instrumentation
Equipment Design
Equipment Failure Analysis
Terahertz Spectroscopy - instrumentation
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Summary:The attenuation of electromagnetic wave propagation in the clear atmosphere from low frequencies up to 2 THz is mainly caused by water vapor. Although there have been many numerical simulations and excellent early sub-mm and far-infrared measurements of this attenuation, there has remained controversy about the background absorption in the most promising windows of transparency below 1 THz. Here, we report an accurate terahertz time-domain spectroscopy (THz-TDS) characterization of water vapor from 0.2 to 2 THz. Our results agree with the previous predicted and measured attenuations for the weak water lines, but show more attenuation for the relatively transparent windows between these lines.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.19.008830