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首页> 外文期刊>Optical engineering >Laser damage of silica optical windows with random antireflective structured surfaces
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Laser damage of silica optical windows with random antireflective structured surfaces

机译：具有随机抗反射结构表面的石英光学窗口的激光损伤

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High intensity nanosecond laser pulses induce damage on uncoated optics and antireflection (AR) coated optics with thin film boundaries. Structured surfaces with AR performance have shown higher damage resistance than conventional AR coatings. This work explores laser-induced damage threshold (LIDT) of random anti reflective surface structures (rARSS), covering interfaces of planar fused silica substrates, using a 7 ± 1 nanosecond duration, single damaging pulse at 1064-nm wavelength. The rARSS treated windows were optimized for AR at 1064 nm, and transmittance of each treated interface was increased by 3.2% per ISO 13697. Incident fluence was controlled near LIDT for both entry and exit sides. Multiple locations were tested for each fluence setting in accordance with ISO 21254 1-on-1 LIDT testing. Double-sided and single-sided rARSS, orientation with both entrance-side and exit-side treatments, were tested to determine effects random structures have in damage induced by field enhancement on the exit side. Results show that rARSS on a single side of an optic have higher resistance to onset of laser damage when located at entry (structured) side. All tests resulting in damage of polished and single-sided rARSS oriented on exit side were ballistic on beam exit facet, showing surface cracks. Results from rARSS located on beam entry side (both single- and double-side treated) showed nonballistic damage and densification of rARSS features from localized melting or reflow, capping the rARSS but still preserving effective-gradient index and rARSS transmission enhancement. This suggests that the localized melting of the rARSS optic surface does not constitute damage optically, or at least not catastrophically within the prebulk damage regime. Therefore, it is possible to foresee the onset of true damage within an optical system via tracking transmission drop, and swap optics out before catastrophic system failure. The drop in transmission acts as an early warning system, making these rARSS optics an invaluable tool in high-energy laser development.
机译：高强度纳秒激光脉冲会导致未镀膜光学器件和具有薄膜边界的防反射（AR）镀膜光学器件受到损坏。具有增透性能的结构化表面显示出比常规增透膜更高的抗损伤性。这项工作探索了随机抗反射表面结构（rARSS）的激光诱导损伤阈值（LIDT），该覆盖层覆盖了平面熔融石英基底的界面，使用7±1纳秒的持续时间，在1064 nm波长处有单个损坏脉冲。 rARSS处理过的窗口针对1064 nm的AR进行了优化，每个处理过的界面的透射率根据ISO 13697提高了3.2％。在入口和出口侧LIDT附近的入射通量都得到控制。根据ISO 21254 1对1 LIDT测试，针对每个通量设置测试了多个位置。测试了双面和单面rARSS（在进入侧和离开侧的处理下的方向），以确定随机结构对出口侧场增强引起的损伤的影响。结果表明，当位于入射（结构化）侧时，光学器件单侧的rARSS具有更高的抵抗激光损伤发作的能力。所有导致出口侧抛光和单面rARSS损坏的测试均在光束出口面上产生弹道，显示出表面裂纹。位于光束入射侧（单面和双面处理）的rARSS的结果显示，非弹道损伤和局部熔化或回流造成的rARSS特征致密化，使rARSS受到限制，但仍保留了有效梯度指数和rARSS传输增强。这表明rARSS光学表面的局部融化不会在前散装损伤范围内光学上或至少不会造成灾难性损坏。因此，可以通过跟踪传输下降来预见光学系统内真正损坏的发生，并在灾难性系统故障之前更换光学系统。传输速度下降是一个预警系统，使这些rARSS光学器件成为高能激光开发中的宝贵工具。

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