A novel laser three-dimension micro processing technology, which is called Laser Ablation by Projective Galvanometer Scanning (LPAGS), has been introduced to fabricate microstructures on free-form surface with high efficiency and high precision firstly by Huazhong University of Science and Technology. The principle of LPAGS is as follows: (1)laser spot size, energy distribution remains basically constant in the range of laser focusing depth of focus(DOF), (2)the reversible property of light. In this paper, the main factor, laser beam orientation, that affects the processing quality is studied. The variation of laser beam orientation will lead to the change of laser spot and energy distribution. The ablation behavior of FTO, PI film irradiated by a 355nm DPSS Q-switched UV laser at different angles for incidence is modeled and experimentally verified.

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