Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Enhancement of Pulsed-Laser Ablation by Phase Explosion of Liquid

액체의 상폭발 과정에 의한 펄스 레이저 용발률의 증진

  • Kim, Dong-Sik (Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Lee, Ho (Dept. of Mechanical Engineering, University of Texas at Austin)
  • Published : 2001.11.01
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Abstract

Enhancement of pulsed-laser ablation by an artificially deposited liquid film is presented. Measurements of ablation rate, ablation threshold, and surface topography arc performed. Correlation between material ablation and photoacoustic effect is examined by the optical beam deflection method. The dependence of ablation rate on liquid-film thickness and chemical composition is also examined. The results indicate that photomechanical effect in the phase explosion of liquid is responsible for the enhanced ablation. The low critical temperature of liquid induces explosive vaporization with localized photoacoustic excitation in the superheat limit and increases the ablation efficiency. Experiments were carried out utilizing a Q-swiched Nd:YAG laser at near-threshold laser fluences with negligible plasma effect (up to ∼100 MW/cm$^2$).

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References

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