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Ultrasensitive and high-dynamic-range two-photon absorption in a GaAs photomultiplier tube

Optics Letters, ISSN: 0146-9592, Vol: 27, Issue: 23, Page: 2076-2078
2002
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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 (mW) and discuss practical ways to reduce this figure of merit to as low as 1 × 10 (mW). © 2002 Optical Society of America.

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