Abstract

We present the development of a high power, tunable far-infrared p-germanium laser spectrometer for the study of dissolved biomolecules in the THz range. As a first application we report on the measurement of the absorption coefficient α for liquid water in the frequency range from 81to96cm−1. Using the p-Ge laser spectrometer we were able to penetrate through layers of up to 100μm thickness. We discuss the advantages and the limitations of this THz spectrometer. We present an analysis of the experimental data based on a χ2 test to provide an objective procedure to minimize the influence of systematic effects, for example of interference due to multiple reflections within the sample chamber. The measured absorption coefficient α lies between (410±6) and (490±6)cm−1 at 81 and 96cm−1, respectively.

Keywords

SpectrometerTerahertz radiationMaterials scienceGermaniumLaserOpticsAttenuation coefficientAbsorption (acoustics)Terahertz spectroscopy and technologySpectroscopyFar-infrared laserAnalytical Chemistry (journal)OptoelectronicsPhysicsChemistrySilicon

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Publication Info

Year
2005
Type
article
Volume
76
Issue
6
Citations
67
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Andreas Bergner, U. Heugen, Erik Bründermann et al. (2005). New p-Ge THz laser spectrometer for the study of solutions: THz absorption spectroscopy of water. Review of Scientific Instruments , 76 (6) . https://doi.org/10.1063/1.1928427

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DOI
10.1063/1.1928427