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BEAM SHAPING WITH SPATIAL MODULATORS FOR LASER MICRO-WELDING OF PLASTICS

机译:用于激光微焊接的空间调制器光束整形

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摘要

This paper reviews the use of diffractive optics for beam shaping of high-power lasers (100 W) for micro-welding of plastics. By using Fourier transformations on two-dimensional complex arrays, spatial domain images were transformed into phase domain images. These images were then used to produce a mask for the microlithography etching of a glass diffractive optical element (DE). An 80 W fiber laser with a wavelength of 1084 nm was coupled in air to the lens to shape the beam into predetermined patterns. These patterns were then reduced with standard optics to a desired size. The images were focused at the faying surface of two plastic components in a through-transmission weld configuration. Weld quality was assessed based on fidelity, burst pressure and consistency. The resulting welds were able to support burst pressures as high as 0.6 MPa. In addition weld features as small as 300 nm were also produced.
机译:本文回顾了衍射光学在塑料微焊接大功率激光器(100 W)的光束整形中的应用。通过在二维复杂阵列上使用傅立叶变换,将空间域图像转换为相域图像。然后将这些图像用于生产用于玻璃衍射光学元件(DE)的微光刻蚀刻的掩模。在空气中将波长为1084 nm的80 W光纤激光器耦合到透镜,以将光束整形为预定图案。然后用标准光学器件将这些图案减小到所需尺寸。图像以直通焊接结构聚焦在两个塑料组件的接合面上。根据保真度,爆破压力和稠度评估焊接质量。所得的焊缝能够承受高达0.6 MPa的爆破压力。另外,还产生了小至300 nm的焊接特征。

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