Abstract

To obtain higher quantum efficiency and longer operational lifetime of negative-electron-affinity GaAs-based photocathodes, illumination conditions using different light sources during the activation process are explored. GaAs photocathodes were activated under white light and 633 nm monochromatic light with different intensities, and experimental quantum efficiencies and photocurrent degradations were compared after activation and recaesiation. The results show that GaAs photocathode can obtain higher quantum efficiency and longer lifetime by using illumination of 633 nm monochromatic light, and this advantage can hardly be achieved by adjusting the intensity of white light. This work verifies an improved solution for preparing GaAs-based photocathodes with satisfactory capability.

© 2019 Optical Society of America

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