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Multilevel Computer Generated Hologram on a Curved Surface for High Power CO2 Laser Beam Shaping

  • Hideki Hagino
  • Choong Sik Park
  • Hisao Kikuta
  • Koichi Iwata
Conference paper

Abstract

A multilevel computer generated hologram (CGH) on a curved surface was developed for the laser beam shaping of a high-power CO2 laser. The CGH with eight height-levels was fabricated by direct-writing laser-beam lithography and the copper electroplating. The fabricated CGH changes a laser beam profile from a Gaussian distribution to a Rectangle-Gaussian distribution. The measured diffraction efficiency was 68%. When a steel surface was exposed to the shaped laser beam, a uniform melted zone was obtained. We investigated the melted zone with respect to the irradiated conditions experimentally.

Keywords

computer generated hologram beam shaping high power CO2 laser curved surface laser processing 

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Copyright information

© Springer-Verlag London Limited 2007

Authors and Affiliations

  • Hideki Hagino
    • 1
  • Choong Sik Park
    • 1
  • Hisao Kikuta
    • 2
  • Koichi Iwata
    • 1
  1. 1.Technology Research Institute of Osaka PrefectureOsaka
  2. 2.Osaka Prefecture UniversityOsaka

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