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Portable terahertz system and its applications
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Paper Abstract

Industrial applications of THz techniques require compact and reliable systems. We have designed and constructed two portable THz systems integrated with femtosecond, erbium- doped fiber lasers. Terahertz emitters based on photoelectron-transport and optically-rectification were tested in the system. With the use of a 10-mW laser pump beam, the signal-to-noise ratio of the system is greater than 5,000. We studied THz beam generation and detection with two different laser wavelengths. Under the consideration of group velocity matching, the frequency response of the THz system is calibrated. Our portable systems have been applied for the coherent measurement of the refractive index and dielectric constant of polymer thin films, which will play an important role in the ongoing quest for higher speeds in integrated circuits. The measurement is based on a comparison of THz phases with and without the film. The refractive index of thin film can be derived according to the phase difference. The system has sufficient sensitivity to perform these measurements on films as thin as 10 microns. We have also used one of these systems for THz measurements of molecular rotation spectra in air/vapor mixtures.

Paper Details

Date Published: 4 June 1999
PDF: 10 pages
Proc. SPIE 3616, Commercial and Biomedical Applications of Ultrafast Lasers, (4 June 1999); doi: 10.1117/12.351830
Show Author Affiliations
Ming Li, Rensselaer Polytechnic Institute (United States)
Xi-Cheng Zhang, Rensselaer Polytechnic Institute (United States)
Gregg Douglas Sucha, IMRA America, Inc. (United States)
Donald J. Harter, IMRA America, Inc. (United States)

Published in SPIE Proceedings Vol. 3616:
Commercial and Biomedical Applications of Ultrafast Lasers
Murray K. Reed; Joseph Neev, Editor(s)

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