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High speed, electrostatic photomultipliers were developed for use in 400 megabit laser communication systems operating at the 1.06 micron wavelength. A high performance, electrostatic III-V photocathode PMT was shown in communication system tests to perform competitively with solid state and avalanche photodiodes. Signal-induced noise and III-V cathode stability were identified as remaining technical problems while cathode quantum efficiencies of or = 5% at 1.06 micron and 320 picosecond rise and fall time pulse performance were achieved.