We observed that the first threshold (i.e. permanent isotropic index change) is not significantly dependent on the doping whereas it is the contrary for the second threshold (i.e. permanent linear birefringence).
© 2009 OSA
M. Lancry, W. Yang, B. Poumellec, and P. Kazansky, "Doping Dependence of the Femtosecond Laser Damage Thresholds in Silica Glasses," in Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, OSA Technical Digest (CD) (Optical Society of America, 2009), paper AWB4.
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