Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Numerical Analysis of Working Distance of Square-shaped Beam Homogenizer for Laser Shock Peening

  • Kim, Taeshin (Department of Advanced Green Energy and Engineering, Handong Global University) ;
  • Hwang, Seungjin (Department of Advanced Green Energy and Engineering, Handong Global University) ;
  • Hong, Kyung Hee (Department of Advanced Green Energy and Engineering, Handong Global University) ;
  • Yu, Tae Jun (Department of Advanced Green Energy and Engineering, Handong Global University)
  • Received : 2017.03.23
  • Accepted : 2017.04.23
  • Published : 2017.06.25
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Abstract

To apply a square-shaped beam homogenizer to laser shock peening, it should be designed with a long working distance and by considering metal targets with various shapes and textures. For long working distances, a square-shaped beam homogenizer with a long depth of focus is required. In the range of working distance, the laser beam is required to have not only high efficiency but high uniformity, in other words, a good peening quality is guaranteed. In this study, we defined this range as the working distance for laser shock peening. We have simulated the effect of some parameters on the working distance. The parameters include the focal length of the condenser lens, pitch size of the array lens, and plasma threshold of the metal. The simulation was performed through numerical analysis by considering the diffraction effect.

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