Waterproof coatings for high-power laser cavities

• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 29-34
• 页数: 6页
• 语种: 英文

摘要

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.