Infrared quantum counting by nondegenerate two photon conductivity in GaAs

Boitier, Fabien; Dherbecourt, Jean-Baptiste; Godard, Antoine; Rosencher, Emmanuel
February 2009
Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p081112
Academic Journal
We report on infrared quantum counting of photons at optical communication wavelengths based on nondegenerate two-photon absorption in a GaAs photomultiplier tube. The detected photon energy is lower than the GaAs band gap and the energy difference is complemented by a high intensity pump field. This detection setup is simple, compact, has a broad spectral bandwidth, and benefits from the intrinsic low noise and dark counts of large band gap semiconductor junctions.


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