Abstract
We demonstrate experimentally ultrafast three-photon counting by three-photon absorption in a GaAsP photomultiplier tube at the wavelength range of , and analyze its sensitivity and time response. Pulse energy of is shown to be detectable for ultrafast 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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