Nanosecond laser damage resistance of differently prepared semi-finished parts of optical multimode fibers
Nanosecond laser damage resistance of differently prepared semi-finished parts of optical multimode fibers
复制标题
不同制备方法的多模光纤半成品的纳秒激光损伤性能
DOI：
10.1016/j.apsusc.2007.09.032
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发表时间：
2007
影响因子：
6.7
通讯作者：
J. Krüger
中科院分区：
文献类型：
--
作者：
G. Mann;Jens Vogel;Rüdiger Preuß;P. Vaziri;M. Zoheidi;M. Eberstein;J. Krüger
多模光纤应用于材料加工（如汽车工业）、国防、航空技术、医药和生物技术等领域。多模光纤生产中一个具有挑战性的任务是提高激光诱导损伤阈值。较高的损伤阈值可以在给定的光纤直径下获得较高的传输平均功率，或者在较薄的光纤内获得相同的功率，从而获得较小的焦点点。原则上，不同的材料参数会影响损伤阈值。除了预制体材料本身的质量外，纤维生产过程中的拉伸工艺和纤维端面的制备也会影响电阻。因此，研究了不同热处理工艺和制备工艺对预制体材料激光损伤阈值的影响。采用调q Nd:YAG激光器，以1064nm波长发射脉冲，脉冲持续时间为15ns，脉冲能量为12mJ，重复频率为10Hz，测量了预制件（F300, Heraeus）的单脉冲和多脉冲激光诱导损伤阈值。精确地控制了激光脉冲的时间和空间形状。激光诱导损伤阈值范围为150Jcm - 2至350Jcm - 2，分别取决于施加在同一点上的脉冲数量、样品的热历史和抛光质量。
Optical multimode fibers are applied in materials processing (e.g. automotive industry), defense, aviation technology, medicine and biotechnology. One challenging task concerning the production of multimode fibers is the enhancement of laser-induced damage thresholds. A higher damage threshold enables a higher transmitted average power at a given fiber diameter or the same power inside a thinner fiber to obtain smaller focus spots. In principle, different material parameters affect the damage threshold. Besides the quality of the preform bulk material itself, the drawing process during the production of the fiber and the preparation of the fiber end surfaces influence the resistance. Therefore, the change of the laser-induced damage threshold of preform materials was investigated in dependence on a varying thermal treatment and preparation procedure. Single and multi-pulse laser-induced damage thresholds of preforms (F300, Heraeus) were measured using a Q-switched Nd:YAG laser at 1064nm wavelength emitting pulses with a duration of 15ns, a pulse energy of 12mJ and a repetition rate of 10Hz. The temporal and spatial shape of the laser pulses were controlled accurately. Laser-induced damage thresholds in a range from 150Jcm−2to 350Jcm−2were determined depending on the number of pulses applied to the same spot, the thermal history and the polishing quality of the samples, respectively.