September 25th, 2020
We experimentally demonstrate a previously unforeseen nonlinear effect in optical fibers: up-conversion luminescence generation excited by multiphoton absorption of femtosecond infrared pulses. We directly estimate the average number of photons involved in the up-conversion process, by varying the wavelength of the pump source. We highlight the role of nonbridging oxygen hole centers and oxygen-deficient center defects and directly compare the intensity of side-scattered luminescence with numerical simulations of pulse propagation.
F. Mangini, M. Ferraro, M. Zitelli, A. Niang, A. Tonello, V. Couderc, S. Wabnitz, “Multiphoton absorption excited upconversion luminescence in optical fiber,” Phys. Rev. Applied 14, 054063 (2020) https://arxiv.org/abs/2009.12459; https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.14.054063