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Title: High-spectral-resolution terahertz imaging with a quantum-cascade laser
Authors: Hagelschuer, TillRothbart, NickRichter, HeikoWienold, MartinSchrottke, LutzGrahn, Holger T.Hübers, Heinz-Wilhelm
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Issue Date: 2016
Published in: Optics Express, Volume 24, Issue 13, Page 13839-13849
Publisher: Washington, DC : Optical Society of America
Abstract: We report on a high-spectral-resolution terahertz imaging system operating with a multi-mode quantum-cascade laser (QCL), a fast scanning mirror, and a sensitive Ge:Ga detector. By tuning the frequency of the QCL, several spectra can be recorded in 1.5 s during the scan through a gas cell filled with methanol (CH3OH). These experiments yield information about the local absorption and the linewidth. Measurements with a faster frame rate of up to 3 Hz allow for the dynamic observation of CH3OH gas leaking from a terahertz-transparent tube into the evacuated cell. In addition to the relative absorption, the local pressure is mapped by exploiting the effect of pressure broadening.
Keywords: Terahertz imaging; Semiconductor lasers; quantum cascade; Spectroscopy; terahertz
DDC: 620
License: CC BY 4.0 Unported
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