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Proceedings Paper

Characterization of photoconducting materials using variable-length picosecond terahertz pulses
Author(s): Bryan E. Cole; Frank A. Hegmann; Jon B. Williams; Mark S. Sherwin; Jeffrey W. Beeman; Eugene E. Haller
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Paper Abstract

A source of high-intensity, ultra-short terahertz pulses has been developed. The operation and performance of a terahertz pulse-slicing system for use with the UCSB free-electron lasers are discussed. Short pulses are sliced from the microsecond long output of the free-electron laser using laser-activated semiconductor switches; the pulse length may be freely varied from a few picoseconds up to four nanoseconds. The temporal response of a heavily compensated gallium-doped germanium photoconductor has been investigated. At low excitation intensity, a recombination time of 2 +/- 0.1 ns is found. At higher THz pulse powers non-exponential relaxation is observed; the data is well modeled using a rate equation approach and including impact- ionization impact-ionization effects due to the terahertz- heated free holes.

Paper Details

Date Published: 29 April 1999
PDF: 10 pages
Proc. SPIE 3617, Terahertz Spectroscopy and Applications, (29 April 1999); doi: 10.1117/12.347121
Show Author Affiliations
Bryan E. Cole, Univ. of California/Santa Barbara (United Kingdom)
Frank A. Hegmann, Univ. of California/Santa Barbara (Canada)
Jon B. Williams, Univ. of California/Santa Barbara (United States)
Mark S. Sherwin, Univ. of California/Santa Barbara (United States)
Jeffrey W. Beeman, Lawrence Berkeley National Lab. (United States)
Eugene E. Haller, Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 3617:
Terahertz Spectroscopy and Applications
Mark S. Sherwin, Editor(s)

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