机械加工
光学
球差
激光加工
材料科学
折射率
梁(结构)
镜头(地质)
激光器
数值孔径
空间光调制器
光圈(计算机存储器)
柱面透镜
激光束
物理
声学
波长
冶金
作者
Huaizhi Zhang,Yingxiong Qin,Jiaming Xu,Hengyang Li,Xiahui Tang
摘要
In the framework of laser precision machining, spherical aberrations of the laser beam increase gradually along the machining depth, which is widely observed due to the refractive index difference between the material of the working pieces and the surrounding medium. In this paper, we report on a simple and effective approach for spherical-aberration-free 3D beam forming inside the materials. This new technique is based on the modified Ewald cap which is related to the numerical aperture of the objective lens, the machining depth, and the refractive index of the material. This method is verified on a laser machining platform, where the phase loaded on the spatial light modulator is acquired by the modified 3D Gerchberg-Saxton algorithm. In the experiment, we have realized line and helical structures with SA compensation, which demonstrate that customized arbitrary intensity distribution inside the material can be realized.
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