Abstract

We demonstrate improved efficiency and dynamic range for two-photon absorption at 1.5 µm in a photoelectron-counting GaAs photomultiplier tube. cw laser measurements show pure two-photon absorption occurring in the device from average powers of 1.3 µW to nearly 1 mW. We use the detector to implement an autocorrelator with peak-power × average-power sensitivity of 1.7×10-4 mW2 and discuss practical ways to reduce this figure of merit to as low as 1×10-5 mW2.

© 2002 Optical Society of America

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