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Picosecond InAlGaAs Photovoltaic Detector with a Graded Superlattice Structure

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Abstract

We report a novel graded-superlattice photovoltaic detector with a steady-state response of picosecond speed. No dc bias voltage is required for its operation. The intrinsic response speed does not depend on the device size. An impulse response of 43-ps full width at half-maximum is observed for a typical device of 108 µm in diameter. The measured response speed varies from 29 to 58 ps for devices of various sizes ranging from 51 to 502 µm.

© 1993 Optical Society of America

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