Abstract

Nonlinear losses experienced by the self-focusing femtosecond pulse is shown to have an important effect on the refractive index modifications in fused silica. The region of the maximum induced change is found to coincide with that of the maximum nonlinear losses of the pulse. It is found as well that material densification and the formation of color centers both contribute to the index change in that zone. Experimental results are supported by numerical simulations using model that takes into account accumulation of the permanent refractive index changes and their influence back on the pulse. Both the color center- and compaction-induced changes cause the modification to develop into a waveguide and lead to the narrowing of supercontinuum spectra.

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