Nonlinear light transformations were observed in a nitrogen-doped silica fiber pumped with a Nd:YAG laser . Light generation in the spectral range 355–430 nm was obtained with an efficiency of up to . The UV light was found to be the result of third-harmonic generation, stimulated Raman scattering of the third harmonic, and third-harmonic generation from the Stokes components of the pump light. Lasing based on the color centers of nitrogen-doped silica was observed in the range 380–430 nm.
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