【摘 要】
：
Single-pulse and multi-pulse damage behaviors of "standard" (with \lambda/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. Preci
【机 构】
：
KeyLaboratoryofMaterialsforHighPowerLaser,ShanghaiInstituteofOpticsandFineMechanics,ChineseAcademyof
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
Single-pulse and multi-pulse damage behaviors of "standard" (with \lambda/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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