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Applied Physics B

, 125:225 | Cite as

Ultrafast modification of oxide glass surface hardness

  • Sean LockerEmail author
  • S. K. Sundaram
Article
  • 54 Downloads

Abstract

Application of femtosecond lasers is widely utilized in micromachining transparent materials. We have successfully altered the surface hardness of various commercial silicate glasses using a high-intensity femtosecond pulse laser. The femtosecond laser generates pulse energy of 500 nJ with a central wavelength of 800 nm. Using a peak power of 2.2 W and a repetition rate of 5.1 MHz, we observed an 18–20% increase surface hardness in glasses with low-modifier content and 16.6% decrease in glasses with high-modifier content. All laser exposed glasses show no detectable induced-crystallization or surface ablation. X-ray photoelectron spectroscopy results of our samples confirmed that the laser irradiation had no detectable effect on surface chemistry. X-ray reflectometry data showed the change in hardness was attributed to a thin layer with modified density. Experimental results suggest the strengthening mechanism derives from local structural transformation of interatomic bond distances and angles.

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Ultrafast Materials Science and Engineering Laboratory (U-Lab), Kazuo Inamori School of Engineering, The New York State College of CeramicsAlfred UniversityAlfredUSA

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