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Characterization of Terahertz Beam Profile and Propagation

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3 Author(s)
John F. Molloy ; National Physical Laboratory, Teddington, U.K. ; Mira Naftaly ; Richard A. Dudley

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.

Published in:

IEEE Journal of Selected Topics in Quantum Electronics  (Volume:19 ,  Issue: 1 )