Abstract

The stability of negative electron affinity ${\mathrm{Ga}}_{0.37}{\mathrm{Al}}_{0.63}\mathrm{As}$ photocathodes in an ultrahigh vacuum system has been investigated. The degraded photocurrents of the Cs/O activated ${\mathrm{Ga}}_{0.37}{\mathrm{Al}}_{0.63}\mathrm{As}$ photocathodes under illumination with different intensity are recorded in real time, and the quantum efficiencies are measured after the degradation. The degraded quantum efficiencies of the photocathode under no illumination are measured at regular intervals. Multiple activations are performed on the ${\mathrm{Ga}}_{0.37}{\mathrm{Al}}_{0.63}\mathrm{As}$ photocathode, after that the quantum efficiencies and the degraded photocurrents are measured. The results indicate that the lifetime of the ${\mathrm{Ga}}_{0.37}{\mathrm{Al}}_{0.63}\mathrm{As}$ photocathode increases as the intensity of illumination decreases, and is longer than that of the GaAs photocathode in the case of no illumination. Besides, the ${\mathrm{Ga}}_{0.37}{\mathrm{Al}}_{0.63}\mathrm{As}$ photocathode performed after the second activation would obtain optimal stability.

© 2013 Optical Society of America

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