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Proceedings Paper

Electromagnetic wave interaction with laser-induced plasmas in GaAs
Author(s): Liyue Mu; William R. Donaldson; Jeff C. Adams; R. Aaron Falk
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Paper Abstract

A multigigahertz microwave signal was generated and up-converted in a GaAs substrate coplanar strip line. Two 630-nm-wavelength laser pulses-one with a normal wavefront, another with a titled wavefront- were respectively used to generate and frequency up-convert the signal. The relativistic plasma front, induced by the tilted optical wavefront, frequency up-shifts the counter-propagating electromagnetic wave via the Doppler effect. When the speed of the plasma front was about 0.4 times the speed of electromagnetic wave in the coplanar strip lines, the experiments showed that the fall time of a step signal decreased more than 30% after the reflection. Given the bandwidth limitations of the data acquisition system, it is possible that a factor of 2 increase was achieved. A transmission line model was employed to simulate this process. The simulation results were consistent with experimental observations. Using coplanar strip lines on a GaAs substrate for microwave signal compression device has the advantage of a high reflection coefficient, frequency tunability, small laser trigger energy, and all-solid-state construction, making this technique suitable for impulse radar applications.

Paper Details

Date Published: 4 January 1995
PDF: 6 pages
Proc. SPIE 2343, Optically Activated Switching IV, (4 January 1995); doi: 10.1117/12.198649
Show Author Affiliations
Liyue Mu, Univ. of Rochester (United States)
William R. Donaldson, Univ. of Rochester (United States)
Jeff C. Adams, Boeing Defense & Space Group (United States)
R. Aaron Falk, Boeing Defense & Space Group (United States)

Published in SPIE Proceedings Vol. 2343:
Optically Activated Switching IV
William R. Donaldson, Editor(s)

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