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Femtosecond laser damage resistance of oxide and mixture oxide optical coatings

机译:飞秒激光对氧化物和混合氧化物光学涂层的抗损伤性

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摘要

We report on the laser damage resistance of ion beam--sputtered oxide materials (Al_(2)O_(3), Nb_(2)O_(5), HfO_(2), SiO_(2), Ta_(2)O_(5), ZrO_(2)) and mixtures of Al_(2)O_(3)-SiO_(2), Nb_(2)O_(5)-SiO_(2), HfO_(2)-SiO_(2), Ta_(2)O_(5)-SiO_(2), and ZrO_(2)-SiO_(2), irradiated by single 500 fs pulses at 1030 nm. Laser-induced damage threshold (LIDT), refractive index, and bandgaps of the single-layer coatings are measured. For pure oxide materials a linear evolution of the LIDT with bandgap is observed. The results are in accordance with our simulations based on photo-ionization and avalanche-ionization. In the case of mixtures, however, deviations from the previous behaviors are evidenced. The evolution of the LIDT as a function of the refractive index is analyzed, and an empirical description of the relation between refractive index and LIDT is proposed.
机译:我们报告了离子束溅射氧化物材料(Al_(2)O_(3),Nb_(2)O_(5),HfO_(2),SiO_(2),Ta_(2)O_( 5),ZrO_(2))和Al_(2)O_(3)-SiO_(2),Nb_(2)O_(5)-SiO_(2),HfO_(2)-SiO_(2),Ta_的混合物(2)O_(5)-SiO_(2)和ZrO_(2)-SiO_(2)由1030 nm的单个500 fs脉冲辐照。测量了单层涂层的激光诱导损伤阈值(LIDT),折射率和带隙。对于纯氧化物材料,观察到LIDT随带隙线性增长。结果与我们基于光电离和雪崩电离的模拟结果一致。但是,在混合的情况下,与以前的行为有偏差。分析了LIDT随折射率的变化,并提出了关于折射率与LIDT之间关系的经验描述。

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