Characterization of Terahertz Beam Profile and Propagation

Characterization of Terahertz Beam Profile and Propagation

Two techniques for imaging a terahertz (THz) beam profile are described and employed in characterizing the THz beam propagation in a time-domain spectrometer. Aperture scanning yields a 2-D cross-sectional map of field amplitude at selected frequencies that is used to track beam evolution along its...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics Vol. 19; no. 1; p. 8401508
Main Authors: Molloy, J. F., Naftaly, M., Dudley, R. A.
Format: Journal Article
Language:English
Published: IEEE 01-01-2013
Subjects:
Apertures
Imaging
Iris
Laser beams
Mirrors
Optical beams
physical optics
submillimeter wave imaging
submillimeter wave propagation
Time domain analysis
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Description
Summary:Two techniques for imaging a terahertz (THz) beam profile are described and employed in characterizing the THz beam propagation in a time-domain spectrometer. Aperture scanning yields a 2-D cross-sectional map of field amplitude at selected frequencies that is used to track beam evolution along its path. The Hartmann test produces a 2-D topographical image of the wavefront, also at selected frequencies. The results are compared with theory, and the respective advantages of the two methods are discussed.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2012.2205668