Micromachining of copper by femtosecond laser pulses

S. Y. Wang, Y. Ren, Chung-Wei Cheng*, J. K. Chen, D. Y. Tzou

*Corresponding author for this work

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Simulation results of femtosecond laser ablation of copper were compared to experimental data. The numerical analysis was performed using a predictive model, including a two temperature model, an optical critical point model with three Lorentzian terms, two phase change models for melting and evaporation under superheating, and a phase explosion criterion for ejection of metastable liquid decomposing into droplets and vapor phase. The experiments were conducted with a 120-fs, 800-nm Ti:sapphire lasers for fluences up to 408 J/cm 2 . The ablation depths were measured, and the ablation rate was estimated. It was shown that the present numerical simulations correlate well with the experimental data over the entire range of the laser fluences investigated except for those below 0.8 J/cm 2 , indicating that the proposed model is an accurate and efficient tool for predicting ultrashort-pulsed laser material ablation.

Original languageEnglish
Pages (from-to)302-308
Number of pages7
JournalApplied Surface Science
Volume265
DOIs
StatePublished - 15 Jan 2013

Keywords

  • Femtosecond laser
  • Material ablation
  • Phase explosion
  • Superheating
  • Two-temperature model

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