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首页> 外文会议>2017 15th International Conference on Quality in Research : International Symposium on Electrical and Computer Engineering >450nm Laser diode beam shaping in engraving process
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450nm Laser diode beam shaping in engraving process

机译：雕刻工艺中的450nm激光二极管光束整形

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摘要

Laser applications in manufacturing processes such as cutting, welding, and engraving processes are become more popular nowadays. High-power and pulsed lasers such as CO2 and Nd:YAG gas lasers are commonly used in applications of metal cutting and welding. Meanwhile, for engraving process laser diode is more preferred due to its properties of compact shape, easy to operate, low power and high efficiency in comparison to CO2 and Nd:YAG laser gas. Owing to the rectangle resonator, the diode laser beam has some inevitable property disadvantages, such as wide-angle divergence, astigmatism and beam profile which has non-ideal elliptical beam shape. These deficiencies lead to a poor quality of beam profile. In order to obtain a high-quality engraving process, two things have to be considered. The first one is a significant requirement of a good beam quality, which is ideally a round beam shape and the second is characterization of burning time and laser intensity for each specific material object. The beam profile quality can be improved by several optical process steps, which finally end up to a perfect Gaussian round beam shape profile. The beam quality improvement can be done by using several-lens structures, for instances: (1) a combination of two sequential cylindrical lenses; (2) the use of two serial anamorphic prisms; (3) cylindrical micro lenses structure and (4) the usage of a single mode optical fiber. In this paper, we design a combination of two sequential cylindrical lenses to reshape a non-ideal beam shape (ellipse) generated from 450-nm laser diode to be more ideal round beam shape, which reduces the divergence angle of the fast axis. Based on the technical experience and consideration the uses of two cylindrical lenses are the most common, low cost and simple method. We analyze the quality of the beam profile by observing the laser-diode burned footprint on the material object. The round beam shape is the best shape and appropriate for engraving process. Moreover, in order to obtain a perfect engraving result, we are also conducting and reporting the burning time and laser intensity characterization.
机译：如今，激光在诸如切割，焊接和雕刻等制造过程中的应用越来越流行。高功率和脉冲激光器，例如CO2和Nd：YAG气体激光器，通常用于金属切割和焊接应用中。同时，对于雕刻工艺而言，由于其紧凑的形状，易于操作，低功率和与CO2和Nd：YAG激光气体相比效率高的特性，更优选激光二极管。由于矩形谐振器，二极管激光束具有一些不可避免的特性缺点，例如广角发散，像散和具有非理想椭圆形光束形状的光束轮廓。这些缺陷导致光束轮廓的质量较差。为了获得高质量的雕刻过程，必须考虑两点。第一个是对良好光束质量的重要要求，理想情况下，光束质量最好是圆形光束，第二个特征是每个特定材料物体的燃烧时间和激光强度的表征。光束轮廓的质量可以通过几个光学处理步骤来改善，最终达到完美的高斯圆光束形状轮廓。可以通过使用多个透镜结构来提高光束质量，例如：（1）两个连续柱面透镜的组合； （2）使用两个串联的变形棱镜； （3）圆柱微透镜结构；（4）使用单模光纤。在本文中，我们设计了两个连续柱面透镜的组合，以将450 nm激光二极管产生的非理想光束形状（椭圆形）整形为更理想的圆形光束形状，从而减小了快轴的发散角。根据技术经验和考虑，使用两个柱面透镜是最常见，成本低且方法简单的方法。我们通过观察激光二极管烧在材料物体上的足迹来分析光束轮廓的质量。圆梁形状是最好的形状，适合雕刻过程。此外，为了获得完美的雕刻效果，我们还在进行和报告燃烧时间和激光强度表征。

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