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Laser welding characterization of kovar and stainless steel alloys as suitable materials for components of photonic devices packaging

机译：可伐合金和不锈钢合金的激光焊接表征，作为光子器件包装组件的合适材料

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The weldaility of Kovar and stainless steel alloys by Nd:YAG laser beam is studied through changing of some laser beam parameters.udIt has been found that there is a suitable interaction of the pulsed laser beam of low power laser pulse with both alloys. The change of thermo physical properties with absorbed energy from the laser pulse is discussed in this paper which reports the suitability of both Kovar and stainless steel 304 as the base materials for photonic devices packaging.udWe used laser weld system (LW400S from Newport) which employs Nd:YAG laser system with three simultaneous beam output for packaging of 980 nm high power laser module. The effect of changing the power density, pulse energy and pulse duration was shown to have a good correlation to both laser spot width and penetration depth. Optimization for both pulse peak power and pulse duration is required in achieving a suitable aspect ratio of laser spot width to penetration depth. This is important o reduce the heat affected zone (HAZ) which affects the sensitive optical components.udAn optimum value of the power density in the order of 10w/cm found to be suitable to induce melting in the welded joints without vaporization. The desired ratio can also be optimized by changing the focus position on the target material as illustrate from our measurements. A theoretical model is developed to simulate the temperature distribution during the laser pulse heating and predict the penetration depth inside the material. From the metallurgical and SEM measurements the weld spot shows a suitable weld yield with reasonable weld width to depth ratio.
机译：通过改变Nd：YAG激光束的参数研究了可伐合金和不锈钢合金的可焊性。 ud发现低功率激光脉冲的脉冲激光束与两种合金都有适当的相互作用。本文讨论了热物理性质随激光脉冲吸收能量的变化，报告了可伐合金和304不锈钢作为光子器件包装基础材料的适用性。 ud我们使用了激光焊接系统（来自Newport的LW400S）采用Nd：YAG激光系统，具有三个同时光束输出，用于包装980 nm高功率激光模块。结果表明，改变功率密度，脉冲能量和脉冲持续时间的效果与激光光斑宽度和穿透深度都具有良好的相关性。为了获得合适的激光光斑宽度与穿透深度的纵横比，需要优化脉冲峰值功率和脉冲持续时间。这对于减少影响敏感光学组件的热影响区（HAZ）至关重要。 ud发现功率密度的最佳值约为10w / cm，适合在不蒸发的情况下在焊接接头中引起熔化。如我们的测量所示，还可以通过更改目标材料上的焦点位置来优化所需比率。建立了理论模型来模拟激光脉冲加热过程中的温度分布并预测材料内部的穿透深度。通过冶金和SEM测量，焊点显示出合适的焊缝产量，且焊缝宽深比合理。

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