Effect of standing-wave field distribution on femosecond laser-induced damage of HfO_2/SiO_2 mirror coating |
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Authors: | Shunli Chen Yuan'an Zhao Hongbo He Ji a Shao Key Laboratory of Materials for High Power Laser |
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Institution: | Shunli Chen1,2,Yuan'an Zhao1,Hongbo He1,and Jianda Shao1 1Key Laboratory of Materials for High Power Laser,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China 2Graduate University of Chinese Academy of Sciences,Beijing 100049,China |
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Abstract: | Single-pulse and multi-pulse damage behaviors of "standard"(with λ/4 stack structure) and "modified"(with reduced standing-wave field) HfO2/SiO2 mirror coatings are investigated using a commercial 50-fs,800-nm Ti:sapphire laser system.Precise morphologies of damaged sites display strikingly different features when the samples are subjected to various number of incident pulses,which are explained reasonably by the standing-wave field distribution within the coatings.Meanwhile,the single-pulse laser-induced damage threshold of the "standard" mirror is improved by about 14% while suppressing the normalized electric field intensity at the outmost interface of the HfO2 and SiO2 layers by 37%.To discuss the damage mechanism,a theoretical model based on photoionization,avalanche ionization,and decays of electrons is adopted to simulate the evolution curves of the conduction-band electron density during pulse duration. |
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