Ultraviolet-light generation in nitrogen-doped silica fiber

Abstract

Nonlinear light transformations were observed in a nitrogen-doped silica fiber pumped with a Nd:YAG laser $\left(\lambda =1.06 \mathit{\mu }\mathrm{m}\right)$. Light generation in the spectral range 355–430  nm was obtained with an efficiency of up to $2\times {10}^{-4}$. 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.

© 1997 Optical Society of America

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