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


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.


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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