2026-10-14T20:02:17Z https://www.scidb.cn/oai

10.57760/sciencedb.26432 2026-04-30T14:30:27Z

2026-04-30 Damage Mechanisms of Mid-infrared Coating Components Induced by 2.1 μm Nanosecond Laser Pulses doi:10.57760/sciencedb.26432 en Mid-infrared (MIR) lasers have important applications in atmospheric detection, materials processing, and laser medicine. However, the robustness of high-power MIR lasers is constrained by the low laser-induced damage resistance of optical coating components. This study, investigated laser-induced damage mechanisms of high-transmittance (HT) and percent-transmittance (PT) coating components susceptible to optical damage in high-power MIR lasers under 2.1 µm laser irradiation. Both HT and PT components showed the damage induced by significant thermal effects. Different damage morphologies were identified on the PT and HT coating surfaces of 2.1 µm PT components, characterized by dome-shaped bulges and funnel-shaped pits due to nodule defects and nano-absorptive precursors, respectively. The analysis of substrate effects on MIR multiband HT coatings (HT 1.9–2.2 & 3.5–4.8 µm) damage revealed that CaF2-based coatings showed higher susceptibility to mechanical interfacial damage compared to fused silica-based coatings, primarily attributed to higher coefficient of thermal expansion (CTE) of CaF2, which induced significant coating–substrate interfacial stress mismatch. These findings provide critical insights for the fabrication of durable MIR optical coatings, paving the way for advancing high-power MIR lasers with enhanced robustness. Mid-infrared laser coatings; Mid-infrared laser-induced damage; High transmittance coating; Percent transmittance coating Jiansheng He Haiyang Wang Mengxia Wang Meng Guo Yuchun Liu Chuanpeng Qian Xisheng Ye Yujie Peng Jianke Yao Yuxin Leng Yuanan Zhao Jianda Shao PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank