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首页> 外文期刊>Applied optics >Preparation of fiber optics for the delivery of high-energy high-beam-quality Nd:YAG laser pulses
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Preparation of fiber optics for the delivery of high-energy high-beam-quality Nd:YAG laser pulses

机译：制备用于传输高能高光束质量Nd：YAG激光脉冲的光纤

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摘要

Recent improvements in design have made it possible to build Nd:YAG lasers with both high pulse energy and high beam quality. These lasers are particularly suited for percussion drilling of holes of as much as 1-mm diameter thick (a few millimeters) metal parts. An example application is the production of cooling holes in aeroengine components for which 1-ms duration, 30-J energy laser pulses produce holes of sufficient quality much more efficiently than with a laser trepanning process. Fiber optic delivery of the laser beam would be advantageous, particularly when one is processing complex three-dimensional structures. However, lasers for percussion drilling are available only with conventional bulk-optic beam delivery because of laser-induced damage problems with the small-diameter (approximately 200-400-μm) fibers that would be required for preserving necessary beam quality. We report measurements of beam degradation in step-index optical fibers with an input beam quality corresponding to an M~(2) of 22. We then show that the laser-induced damage threshold of 400-μm core-diameter optical fibers can be increased significantly by a CO_(2) laser treatment step following the mechanical polishing routine. This increase in laser-induced damage threshold is sufficient to propagate 25-J, 1-ms laser pulses with a 400-μm core-diameter optical fiber and an output M~(2) of 31.
机译：设计上的最新改进使构建具有高脉冲能量和高光束质量的Nd：YAG激光器成为可能。这些激光特别适合对直径最大为1毫米（几毫米）的金属零件进行打孔钻削。一个示例应用是在航空发动机部件中生产冷却孔，对于这些冷却孔，持续时间为1毫秒，能量为30-J的激光脉冲产生的孔质量要比激光打孔工艺有效得多。激光束的光纤传输将是有利的，特别是当正在处理复杂的三维结构时。但是，由于用于保留必要光束质量所需的小直径（大约200-400μm）光纤的激光引起的损伤问题，用于冲击钻削的激光器仅在常规的散装光束传输中可用。我们报告了阶跃折射率光纤的光束衰减测量结果，输入光束质量对应于M〜（2）为22。然后，我们证明了可以增加400μm芯直径光纤的激光损伤阈值通过机械抛光程序后的CO_（2）激光处理步骤，可以显着提高效率。激光引起的损伤阈值的这种增加足以传播25-J，1毫秒的激光脉冲，其芯径为400μm的光纤且输出M〜（2）为31。

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