Thermomechanical model of mirror laser damage at 1.06 um: II. Flat bottom pits formation

Jean Dijon; Guillaume Ravel; Bernard Andre

doi:10.1117/12.344395

7 April 1999 Thermomechanical model of mirror laser damage at 1.06 μm: II. Flat bottom pits formation

Jean Dijon, Guillaume Ravel, Bernard Andre

Proceedings Volume 3578, Laser-Induced Damage in Optical Materials: 1998; (1999) https://doi.org/10.1117/12.344395
Event: Laser-Induced Damage in Optical Materials: 1998, 1998, Boulder, CO, United States

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.

Citation Download Citation

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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