Characterization of photoconducting materials using variable-length picosecond terahertz pulses

Bryan E. Cole; Frank A. Hegmann; Jon B. Williams; Mark S. Sherwin; Jeffrey W. Beeman; Eugene E. Haller

doi:10.1117/12.347121

29 April 1999 Characterization of photoconducting materials using variable-length picosecond terahertz pulses

Bryan E. Cole, Frank A. Hegmann, Jon B. Williams, Mark S. Sherwin, Jeffrey W. Beeman, Eugene E. Haller

Proceedings Volume 3617, Terahertz Spectroscopy and Applications; (1999) https://doi.org/10.1117/12.347121
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

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.

Citation Download Citation

Bryan E. Cole, Frank A. Hegmann, Jon B. Williams, Mark S. Sherwin, Jeffrey W. Beeman, and Eugene E. Haller "Characterization of photoconducting materials using variable-length picosecond terahertz pulses", Proc. SPIE 3617, Terahertz Spectroscopy and Applications, (29 April 1999); https://doi.org/10.1117/12.347121

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available