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7 June 2006 Refractive-index increase in laser-written waveguides in glasses
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Proceedings Volume 6261, High-Power Laser Ablation VI; 626132 (2006)
Event: High-Power Laser Ablation 2006, 2006, Taos, NM, United States
We present estimates of the refractive-index change in waveguides in silica produced by focused femtosecond laser pulses. The estimates are based on the shift of the central frequency of ω4 (TO) band (Si-O stretching mode) in micro-Raman spectra. These data were compared with the relation of this parameter to density and to refractive index changes in seen in glasses modified by high pressure or irradiation. We conclude that the measured refractive-index increase in the waveguides can be explained by densification of glass.
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Alexander M. Streltsov, Carl W. Ponader, and Joseph F. Schroeder III "Refractive-index increase in laser-written waveguides in glasses", Proc. SPIE 6261, High-Power Laser Ablation VI, 626132 (7 June 2006);

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