Impact of the Polishing Suspension Concentration on Laser Damage of Classically Manufactured and Plasma Post-Processed Zinc Crown Glass Surfaces
Impact of the Polishing Suspension Concentration on Laser Damage of Classically Manufactured and Plasma Post-Processed Zinc Crown Glass Surfaces
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DOI：
10.3390/app8091556
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发表时间：
2018-09-01
影响因子：
2.7
通讯作者：
Stappenbeck, Marco
中科院分区：
文献类型：
--
作者：
Gerhard, Christoph;Stappenbeck, Marco
光学器件的激光损伤阈值是高功率激光应用中的一个重要问题。然而，复杂的和部分相互作用的机制，以及玻璃表面的激光损伤的根本原因尚未完全理解。本工作的目的是有助于更好地了解这种损伤机制，通过提供原始结果的影响，经典的玻璃表面加工的激光诱导损伤阈值。为此目的，玻璃样品是根据所使用的研磨剂和抛光剂以及悬浮液的明确定义的工艺条件制备的。此外，通过大气压等离子体对样品进行后处理以进行精确清洁。在等离子体后处理之前和之后，确定激光诱导的损伤阈值和由制造过程中的残留物引起的表面污染。结果表明，抛光液浓度对激光损伤阈值和抛光液残留物对表面的污染有一定的影响。最高的损伤阈值为15.2 J/cm（2）被发现的最低的表面污染的碳，发生在最高的抛光悬浮液浓度的情况下。在等离子体处理仅仅60秒后，由于去除了表面粘附的碳，该值增加到20.3 J/cm（2）。因此，结果意味着，激光诱导损伤阈值可以显着增加，首先选择适当的工艺参数在经典的制造和第二等离子体后处理的表面抛光。
The laser-induced damage threshold of optics is an issue of essential importance in high-power laser applications. However, the complex and partially interacting mechanisms as well as the underlying reasons for laser damage of glass surfaces are not yet fully understood. The aim of the present work is to contribute to a better understanding of such damage mechanisms by providing original results on the impact of classical glass surface machining on the laser-induced damage threshold. For this purpose, glass samples were prepared with well-defined process conditions in terms of the used lapping and polishing agents and suspensions. Further, the samples were post-processed by atmospheric pressure plasma for precision cleaning. The laser-induced damage threshold and surface contamination by residues from the manufacturing process were determined before and after plasma post-processing. It is shown that the polishing suspension concentration has a certain impact on the laser-induced damage threshold and surface contamination by residues from used working materials. The highest damage threshold of 15.2 J/cm(2) is found for the lowest surface contamination by carbon which occurs in the case of the highest polishing suspension concentration. After plasma treatment for merely 60 s, this value was increased to 20.3 J/cm(2) due to the removal of surface-adherent carbon. The results thus imply that the laser-induced damage threshold can notably be increased by first choosing appropriate process parameters during classical manufacturing and second plasma post-processing for surface finishing.