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Ultra-sensitive, high dynamic range two-photon absorption in a GaAs photomultiplier tube Authors Jeffrey M. Roth, jroth@ll.mit.edu Abstract We demonstrate improved efficiency and dynamic range for two-photon absorption at 1.5 um 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 uW up to nearly 1 mW. We use the detector to implement an autocorrelator with peak-power times average-power sensitivity of 1.7e-4 (mW^2) and we discuss practical ways to reduce this figure of merit to as low as 1e-5 (mW^2). Download/View
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