Waterproof coatings for high-power laser cavities
Waterproof coatings for high-power laser cavities
复制标题
DOI：
10.1038/s41377-018-0118-6
复制
发表时间：
2019-01-23
影响因子：
19.4
通讯作者：
Wang, Zhanshan
中科院分区：
文献类型：
--
作者：
Cheng, Xinbin;Dong, Siyu;Wang, Zhanshan
随着激光功率和重复频率的不断提高，激光介质的热控制变得越来越重要。除了广泛使用的空气冷却或粘结式散热器外，激光介质的水冷却在排出余热方面更有效。然而，如何保护潮解激光介质不受水侵蚀是一个具有挑战性的问题。因此，提出了一种新型的防水涂料来保护掺钕玻璃不受水侵蚀。在阐明了单层膜的防水性能与其微观结构和孔特征的关系后，针对目前缺乏同时具有致密的非晶态结构和宽禁带的高指数材料的问题，采用离子辅助共蒸发法制备了二氧化汞掺杂的纳米复合材料。Hf0.7Si0.3O2/SiO_2多功能涂层具有优良的防水性能、较高的激光损伤阈值(LIDT)和良好的光谱性能，可作为高功率激光腔热控制的使能元件。
With the ever-increasing laser power and repetition rate, thermal control of laser media is becoming increasingly important. Except for widely used air cooling or a bonded heat sink, water cooling of a laser medium is more effective in removing waste heat. However, how to protect deliquescent laser media from water erosion is a challenging issue. Here, novel waterproof coatings were proposed to shield Nd:Glass from water erosion. After clarifying the dependence of the waterproof property of single layers on their microstructures and pore characteristics, nanocomposites that dope SiO2 in HfO2 were synthesized using an ion-assisted co-evaporation process to solve the issue of a lack of a high-index material that simultaneously has a dense amorphous microstructure and wide bandgap. Hf0.7Si0.3O2/SiO2 multifunctional coatings were finally shown to possess an excellent waterproof property, high laser-induced damage threshold (LIDT) and good spectral performance, which can be used as the enabling components for thermal control in high-power laser cavities.