6 December 2016 Few-cycle pulse laser-induced damage of thin films in air and vacuum ambience
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Laser-induced damage mechanisms were investigated for an ultra-broadband chirped mirror, as part of a systematic study of few-cycle pulse laser-induced damage threshold (LIDT) of widely-used ultra-broadband optics, in vacuum and in air, for single and multi-pulse regimes (S-on-1). Microscopic analysis of damage morphology suggests that three different damage mechanisms occur across the fluence range 0.15-0.4J/cm2, while no ablation was yet observed. The three regimes resulted in shallow swelling (< 10 nm tall), tall blistering (~ 150 nm tall), and annular blistering (damage suppressed at highest intensity, forming a ring shape). Descriptions of the potential mechanisms are discussed.
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Kyle R. P. Kafka, Kyle R. P. Kafka, Noah Talisa, Noah Talisa, Gabriel Tempea, Gabriel Tempea, Drake R. Austin, Drake R. Austin, Catalin Neacsu, Catalin Neacsu, Enam A. Chowdhury, Enam A. Chowdhury, } "Few-cycle pulse laser-induced damage of thin films in air and vacuum ambience", Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100140D (6 December 2016); doi: 10.1117/12.2245179; https://doi.org/10.1117/12.2245179

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