Universität zu Köln

Thirunavukkuarasu, K., Langenbach, M., Roggenbuck, A., Vidal, E., Schmitz, H., Hemberger, J. and Grueninger, M. (2015). Self-normalizing phase measurement in multimode terahertz spectroscopy based on photomixing of three lasers. Appl. Phys. Lett., 106 (3). MELVILLE: AMER INST PHYSICS. ISSN 1077-3118

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Abstract

Photomixing of two near-infrared lasers is well established for continuous-wave terahertz spectroscopy. Photomixing of three lasers allows us to measure at three terahertz frequencies simultaneously. Similar to Fourier spectroscopy, the spectral information is contained in an interferogram, which is equivalent to the waveform in time-domain spectroscopy. We use one fixed terahertz frequency nu(ref) to monitor temporal drifts of the setup, i.e., of the optical path-length difference. The other two frequencies are scanned for broadband high-resolution spectroscopy. The frequency dependence of the phase is obtained with high accuracy by normalizing it to the data obtained at nu(ref), which eliminates drifts of the optical path-length difference. We achieve an accuracy of about 1-2 mu m or 10(-8) of the optical path length. This method is particularly suitable for applications in nonideal environmental conditions outside of an air-conditioned laboratory. (C) 2015 AIP Publishing LLC.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Thirunavukkuarasu, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Langenbach, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roggenbuck, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vidal, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmitz, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hemberger, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-414572
DOI:	10.1063/1.4906374
Journal or Publication Title:	Appl. Phys. Lett.
Volume:	106
Number:	3
Date:	2015
Publisher:	AMER INST PHYSICS
Place of Publication:	MELVILLE
ISSN:	1077-3118
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CONTINUOUS-WAVE; GENERATION; TOMOGRAPHY; RADIATION; SYSTEM; DELAY Multiple languages Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41457