Schematic view of the emittance measurement method.
Beam profile on the CCD camera after 30 accumulation cycles and a numerical fit to the data (solid line).
Each point represents the position of a beamlet in phase-space and the error bars indicate the spread of the divergence angle.
Schematic view of the laser and transport system.
Schematic view of the 200-kV polarized electron gun.
Crystal structure and doping density of the GaAs-GaAsP SL strained sample.
Normalized rms emittances as a function of the extracted voltage between the electrodes.
Photoemission process of a NEA photocathode.
Normalized rms emittances as a function of the laser wavelengths for bulk GaAs.
Normalized rms emittances as a function of the laser wavelengths for GaAs-GaAsP.
Comparison of the experimental normalized emittances of bulk GaAs and GaAs-GaAsP as a function of kinetic energy .
Energy band structure of a GaAs-GaAsP superlattice.
Normalized rms emittances as a function of quantum efficiency.
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