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We experimentally demonstrate a novel nonlinear effect in optical fibers:upconversion luminescence generation excited by multiphoton absorption offemtosecond infrared pulses. We directly estimate the average number of photonsinvolved in the up-conversion process, by varying the wavelength of the pumpsource. We highlight the role of non-bridging oxygen hole centers and oxygendeficient center defects, and directly compare the intensity of side-scatteredluminescence with numerical simulations of pulse propagation.

Multiphoton absorption excited upconversion luminescence in optical fiber