TITLE

Fast optical nonlinearity induced by space-charge waves in dc-biased GaAs

AUTHOR(S)
Subačius, L.; Kašalynas, I.; Aleksiej&usline;nas, R.; JarašI&usline;nas, K.
PUB. DATE
August 2003
SOURCE
Applied Physics Letters;8/25/2003, Vol. 83 Issue 8, p1557
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Time-resolved four-wave mixing in dc-biased GaAs crystals exhibit GHz frequency oscillations when the applied dc field and nonequilibrium carrier density are high enough to form a photorefractive high-field domain grating. Its propagation through the spatially modulated carrier density structure creates a photorefractive space-charge wave and leads to an oscillatory behavior of the probe-beam diffraction efficiency with period T=Λ/ν≈200 ps, determined by the grating spacing Λ and domain drift velocity ν. Formation of the space-charge wave in dc-biased GaAs was verified experimentally by using a picosecond transient grating technique. The experimental data were found to be in good agreement with numerical calculations based on the hot electron hydrodynamic model. © 2003 American Institute of Physics.
ACCESSION #
10603839

 

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