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7 April 1999 Thermomechanical model of mirror laser damage at 1.06 μm: II. Flat bottom pits formation
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Abstract
Other defects than nodules are responsible for laser damage of High Reflection coatings at 1.06 micrometers . Among them, flat bottom pits (FBP) are particularly interesting because they are surface induced damages not related with preexisting cosmetic defects. The damage morphology observed with a Scanning Electron Microscope suggest that damages are related to absorbing nanometric centers. Following this idea, a model of FBP formation is developed in this paper. This model predicts a size dependence of the FBP versus the thickness of the buckled layers; this fact is experimentally confirmed. Two different kinds of FBP have been observed; the second one might be related with the seed of nodular defects.
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Jean Dijon, Guillaume Ravel, and Bernard Andre "Thermomechanical model of mirror laser damage at 1.06 μm: II. Flat bottom pits formation", Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); https://doi.org/10.1117/12.344395
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