Transmission vs reflection modes

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Presentation transcript:

Transmission vs reflection modes Transmission mode Reflection mode Glass Window Photon electron vacuum 1 mm vacuum Reflective layer Photocathode electron

Reflection Mode vs. Transmission Mode Factor ~ 1.5 to 2 x higher Quantum Efficiency Wavelength [D.Ferenc, UC SD]

Hybrid photocathode Photon Photon Water Glass window Photocathode #1 1 mm GaAsP Cs-O NEA layer Al protective layer Photon electron GaAsP GaAsP Photocathode #2

Hybrid photocathode Photon Water Glass window Photocathode #1 1 mm GaAsP Cs-O NEA layer Al protective layer electron GaAsP GaAsP Photocathode #2

GaAs emission properties