[SLAC Pubs and Reports]
Resonance Enhancement of Spin-Polarized Electron Emission from Strain-Compensated AlInGaAs-GaAsP Superlattices
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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