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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