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Diffractive beam shaping for enhanced laser polymer welding

机译：衍射光束整形以增强激光聚合物焊接

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摘要

Laser welding of polymers increasingly finds application in a large number of industries such as medical technology, automotive, consumer electronics, textiles or packaging. More and more, it replaces other welding technologies for polymers, e. g. hot-plate, vibration or ultrasonic welding. At the same rate, demands on the quality of the weld, the flexibility of the production system and on processing speed have increased. Traditionally, diode lasers were employed for plastic welding with flat-top beam profiles. With the advent of fiber lasers with excellent beam quality, the possibility to modify and optimize the beam profile by beam-shaping elements has opened. Diffractive optical elements (DOE) can play a crucial role in optimizing the laser intensity profile towards the optimal M-shape beam for enhanced weld seam quality. We present results on significantly improved weld seam width constancy and enlarged process windows compared to Gaussian or flat-top beam profiles. Configurations in which the laser beam diameter and shape can be adapted and optimized without changing or aligning the laser, fiber-optic cable or optical head are shown.
机译：聚合物的激光焊接越来越多地应用于许多行业，例如医疗技术，汽车，消费电子，纺织品或包装。越来越多地，它取代了其他用于聚合物的焊接技术，例如G。热板，振动或超声波焊接。同样，对焊接质量，生产系统的灵活性和加工速度的要求也提高了。传统上，二极管激光器用于具有平顶光束轮廓的塑料焊接。随着具有优良光束质量的光纤激光器的出现，通过光束整形元件来修改和优化光束轮廓的可能性已经打开。衍射光学元件（DOE）在朝着最佳M形光束优化激光强度轮廓以提高焊缝质量方面起着至关重要的作用。与高斯或平顶光束轮廓相比，我们提出的结果显着改善了焊缝宽度的恒定性并扩大了工艺窗口。示出了在不改变或对准激光器，光纤电缆或光学头的情况下可以适应和优化激光束直径和形状的配置。

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