[SLAC]
[SLAC Pubs and Reports]
SLAC-PUB-12248
Enhancement of Spin-Polarized Electron Emission from Strain-Compensated AlInGaAs-GaAsP Superlattices
Abstract
Resonance enhancement of the quantum efficiency of new polarized electron
photocathodes based on a short-period strain-compensated AlInGaAs/GaAsP
superlattice structure is reported. The superlattice is a part of an integrated
Fabry-Perot optical cavity. We demonstrate that the Fabry-Perot resonator enhances
the
quantum efficiency by up to a factor 10 in the wavelength region of the main
polarization maximum. The high structural quality implied by these results
points
to the very promising application of these photocathodes for spin-polarized
electron sources.
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