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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 12,
  • Issue 12,
  • pp. 121402-121402
  • (2014)

Doping transition metal ions as a method for enhancement of ablation rate in femtosecond laser irradiation of silicate glass

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We present a doping method to improve the femtosecond laser ablation rate and promote ablation selectivity. Doping transition metal ions, Co2+ or Cu2+, in silicate glass apparently change absorption spectroscopy and induce resonant absorption at wavelengths of 600 and 800 nm, respectively. Comparing with femtosecond laser processing of the same glass without doping, we find that the threshold fluence decreases and the ablation rate increases in resonant absorption in doped silicate glass. Resonant absorption effectively increases multiphoton ionization for seed-free electron generation, which in turn enhances avalanche ionization.

© 2014 Chinese Optics Letters

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