Growth of Laser initiated damage in insensitive optical glasses at 355 nm
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摘要: 光学元件的使用寿命是决定高能激光器稳定运行的重要因素。针对传统光学玻璃在高能激光系统中使用寿命较短的缺点，研发了钝感光学玻璃。钝感光学玻璃具有激光损伤增长阈值高和激光损伤增长速度慢的优点，因而具有较长的使用寿命。基于355 nm激光开展了钝感光学玻璃损伤增长的研究。结果表明：钝感光学玻璃的激光损伤增长阈值为7～12 J/cm2，零概率激光损伤增长阈值为7 J/cm2，是同样实验条件下熔石英玻璃的2倍。钝感光学玻璃在较高激光辐照能量下（>12 J/cm2），呈指数型增长，增长速度较熔石英玻璃慢，增长系数仅为熔石英的0.53倍。钝感光学玻璃的研究，为解决高能激光装置中三倍频光学玻璃使用寿命短的问题提供了一种新的思路。Abstract:
Background The service life of optical glass is a critical factor determining the stable operation of high-power laser systems. Currently, fused silica glass exhibits relatively short service life under laser irradiation, which severely limited the stable operation and development of high-power laser systems. The primary reason for the short service life of fused silica glass is laser-induced damage after triple-frequency laser irradiation and the fused silica components unusable due to degradation.Purpose To address the issue of short service life of current optical glass in high-energy laser systems, An insensitive optical glass has been developed. Insensitive optical glass exhibits optical properties comparable to fused silica glass but demonstrates longer service life under intense laser irradiation. Its chemical composition is similar to traditional glass, yet it possesses a unique mesoscopic structure. The advantages of insensitive optical glass over traditional glass include higher laser damage growth threshold and slower laser damage progression. When initial damage occurs in the glass, subsequent laser irradiation results in slower laser damage progression in insensitive optical glass, thereby extending its service life.Methods The insensitive optical glass was prepared in the laboratory and synthesized using a liquid-phase method to produce nanoscale glass powder, and then vitrified. Research on the damage growth of insensitive optical glass was conducted based on 355 nm laser irradiation. The laser damage threshold and damage growth threshold of the glass were measured using the R:1 method, which involves gradually increasing the laser energy from values significantly below the initial damage threshold for the same test point until laser damage occurs, recording the laser energy density at which damage is induced for each test point.Results The damage growth of the insensitive optical glass was studied based on 355 nm lasers. The results show that the laser damage growth threshold of insensitive optical glass is 7-12 J/cm2, and the threshold of zero probability laser damage growth is 7 J/cm2, which is twice than that of fused silica glasses under the same conditions. Under high laser fluence (>12 J/cm2), the insensitive optical glass exhibits exponential growth, with a slower growth rate than fused silica glasses and a growth coefficient only 0.53 times that of fused silica glasses. The research on insensitive optical glasses provides a new approach to solve the problem of short service life of third harmonic optical glasses in high-energy laser systems.Conclusions This article conducts research on the growth of laser damage in insensitive optical glass. The characteristics of high threshold and slow growth of laser damage in insensitive optical glass were verified. It provides a new approach to solve the problem of short service life of third harmonic optical glass in high-energy laser devices. -
图 3 玻璃激光损伤增长形貌的演变
Figure 3. Morphology evolution of laser-induced damage growth on glasses
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