Multilevel Computer Generated Hologram on a Curved Surface for High Power CO2 Laser Beam Shaping
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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.
Keywordscomputer generated hologram beam shaping high power CO2 laser curved surface laser processing
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