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Beam Shaping Optics for YAG Laser Processing Fabricated by Computerized Numerical Control Lathe

  • OPTICAL SYSTEMS AND TECHNOLOGIES
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Abstract

A method for a beam shaping optics is proposed to convert a laser beam profile into arbitrary required intensity distribution. Surface profile of the beam shaping optics is designed by using Snell's law to convert the required intensity distribution at the beam irradiation plane from the input intensity distribution. A computerized numerical control (CNC) lathe is employed to fabricate the beam shaping optics, and acrylic resin is used for the material. The acrylic resin plate is cut by a ball type of grinding wheel tool consisted on diamond powder and polished by a cone type felt buff with alumina ceramics powder. The CNC lathe is powerful tool to control the position of these tools. The fabricated beam shaping optics is aspheric shape with 4 mm of thickness and it works to convert the intensity distribution of multi-mode beam profile with 13 mm of diameter into a flat top cylinder with 1 mm of diameter. A working distance of the beam shaping optics is 60 mm, and its transmittance is over 98%. It succeeds to fabricate uniform melting mark of 0.6 mm diameter on a steel target by the YAG laser process.

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Authors and Affiliations

  1. Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan

    Ryoichi Kuwano, Yukitoshi Otani & Norihiro Umeda

  2. Mechanical Engineering Section, Fukuyama Polytechnic College, 4-8-48 Kitahonjo, Fukuyama, Hiroshima, 720-0074, Japan

    Ryoichi Kuwano

  3. Precision Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba, 275-0016, Japan

    Tsuyoshi Tokunaga

  4. College Optical Sciences, The University of Arizona, 1630E. University Blvd., Tucson, AZ, 85721, U.S.A.

    Yukitoshi Otani

Authors
  1. Ryoichi Kuwano
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  2. Tsuyoshi Tokunaga
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  3. Yukitoshi Otani
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  4. Norihiro Umeda
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Kuwano, R., Tokunaga, T., Otani, Y. et al. Beam Shaping Optics for YAG Laser Processing Fabricated by Computerized Numerical Control Lathe. OPT REV 12, 476–479 (2005). https://doi.org/10.1007/s10043-005-0476-1

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  • DOI: https://doi.org/10.1007/s10043-005-0476-1

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