Ultrafast beam dump materials and mirror coatings tested with the ELI beamlines LIDT test station

M. Ďurák, D. Kramer, P. Velpula, J. Cupal, T. Medřík, J. Hrebicek, J. Golasowski, D. Peceli, L. Fekete, V. Stepan, M. Kozlová, B. Rus
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引用次数: 3

Abstract

The ELI Beamlines project will deliver ultrafast laser pulses with peak powers up to 10PW available every minute and PW class beams at 10Hz complemented by a 10TW 1kHz beamline. To properly determine damage thresholds of involved optical components in conditions similar to the operational environment and with expected laser parameters, a high vacuum LIDT test station was constructed at PALS facility. Our study presents results of ISO based S-on-1 and R-on-1 tests in femtosecond regime (50fs, 800nm, 10Hz/1kHz) performed on two different types of coatings: a) highabsorption black coatings with low outgassing rates, intended for use as a beam dump surface; and b) high-reflectivity, low-dispersion 45° AOI ultrafast mirror coatings. Testing of absorptive coatings was accompanied with QMS residual gas analysis to verify, that high intensity laser radiation approaching the damage threshold does not increase concentration of volatile organic compounds in the vacuum chamber. In case of HR mirror coatings, we also investigate the effect of cleaning on LIDT value, comparing characteristic S-on-1 curves of given sample with values obtained after 12h immersion in ethanol-water solution.
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用ELI光束线LIDT测试站测试了超快光束转储材料和反射镜涂层
ELI光束线项目将提供峰值功率高达每分钟10PW的超快激光脉冲和10Hz的PW级光束,并辅以10TW的1kHz光束线。为了在接近操作环境和预期激光参数的条件下正确确定相关光学元件的损伤阈值,在PALS设施建立了高真空LIDT试验站。我们的研究展示了基于ISO的S-on-1和R-on-1在飞秒范围内(50fs, 800nm, 10Hz/1kHz)对两种不同类型的涂层进行的测试结果:a)具有低放气率的高吸收率黑色涂层,用于光束卸载表面;b)高反射率、低色散45°AOI超快反射镜涂层。对吸收涂层进行测试,并结合QMS残余气体分析验证,接近损伤阈值的高强度激光辐射不会增加真空室中挥发性有机化合物的浓度。对于HR镜面涂层,我们还研究了清洗对LIDT值的影响,将给定样品的特征S-on-1曲线与在乙醇水溶液中浸泡12h后获得的值进行了比较。
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