期刊
OPTICS EXPRESS
卷 19, 期 9, 页码 8830-8838出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.008830
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资金
- DTRA [10-2960M]
- Air Force Research Laboratory (AFRL)
- National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [0757680] Funding Source: National Science Foundation
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. (C)2011 Optical Society of America
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