Abstract

We demonstrate experimentally ultrafast three-photon counting by three-photon absorption in a GaAsP photomultiplier tube at the wavelength range of 18001900nm, and analyze its sensitivity and time response. Pulse energy of 500fJ is shown to be detectable for ultrafast 170fs pulses. The presented three-photon counter may serve as a unique tool for ultrafast quantum state characterization as well as for ultrasensitive third-order temporal measurements.

© 2011 Optical Society of America

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