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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 29, Iss. 10 — Oct. 1, 2012
  • pp: 2665–2668

Correlation of the refractive index change at the surface and inside phosphate glass upon femtosecond laser irradiation

Daniel Puerto, Jan Siegel, Andres Ferrer, Javier Hernandez-Rueda, and Javier Solis  »View Author Affiliations

JOSA B, Vol. 29, Issue 10, pp. 2665-2668 (2012)

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A study of the surface modification induced by single femtosecond laser pulses in phosphate glass has revealed surface swelling at fluences just below the ablation threshold. This behavior is different from that observed in other dielectric materials. Optical micrographs obtained with monochromatic light show a pattern of Newton rings within the swollen region whose number scales inversely with the illumination wavelength, acting as a micro Fabry–Perot etalon. The swollen surface layer has lower refractive index than the bulk glass and can reach a maximum thickness of 820 nm. We relate these findings to results obtained during subsurface waveguide writing inside phosphate glass, which also show a refractive index decrease at energies near threshold for waveguide fabrication. We have identified low density free-electron plasma to be the trigger of the refractive index change.

© 2012 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(350.5400) Other areas of optics : Plasmas

ToC Category:
Lasers and Laser Optics

Original Manuscript: May 31, 2012
Revised Manuscript: July 26, 2012
Manuscript Accepted: July 27, 2012
Published: September 6, 2012

Daniel Puerto, Jan Siegel, Andres Ferrer, Javier Hernandez-Rueda, and Javier Solis, "Correlation of the refractive index change at the surface and inside phosphate glass upon femtosecond laser irradiation," J. Opt. Soc. Am. B 29, 2665-2668 (2012)

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