Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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Comparison study of nanosecond laser induced wet and dry ablation of PMMA

나노초 레이저를 이용한 PMMA의 습식 및 건식어블레이션 비교 연구

  • lee, Ho (Kyungpook National University, School of Mechanical engineering)
  • 이호 (경북대학교 기계공학부)
  • Received : 2019.04.01
  • Accepted : 2019.05.29
  • Published : 2019.06.30
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Abstract

The nanosecond laser assisted ablation have been investigated. The biocompatable polymer PMMA was employed as the target material and the two distinctive surface conditions were test. The first surface condition is a dry surface for which the target surface is exposed to air and the second surface condition is the wet surface for which the target surface is covered with dehydrated water. The ablation volume, the laser induced acoustic wave, the laser induced plasma were investigated for both wet and dry condition. The nanosecond laser pulse ablatied more on the wet surface compared to the dry surface. The enhanced ablation of wet surface is attributed to the confined acoustic wave and the laser-induced plasma in the liquid layer.

Keywords

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그림. 1 나노초 레이저를 이용한 어블레이션 실험 개요도.

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그림. 2 레이저가 만들어낸 crater의 단면을 OCT로 찰영한 영상.

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그림. 3 건식 및 습식 어블레이션 조건에서 측정된 레이저 어블레이션량(체적) 비교

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그림. 4 Microphone으로 측정한 forward acoustic wave의 일반적인 trace (a)와 high frequency transducer가 측정한 backward acoustic wave의 일반적인 trace (b)

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그림. 5 건식 및 습식 어블레이션 도중 발생하는 forward(a) 및 backward(b) 음파의 크기 비교

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그림. 6 나노초 펄스가 야기한 플라즈마의 intensity를 photodiode로 측정한 trace

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그림. 7 포토다이오드로 측정된 습식 및 건식 어블레이션의 플라즈마의 상대적인 강도 비교

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