Fracture related initiation and growth of surface laser damage in fused silica

H. Bercegol; P. Grua

doi:10.1117/12.804419

30 December 2008 Fracture related initiation and growth of surface laser damage in fused silica

H. Bercegol, P. Grua

Proceedings Volume 7132, Laser-Induced Damage in Optical Materials: 2008; 71321B (2008) https://doi.org/10.1117/12.804419
Event: Boulder Damage Symposium XL Annual Symposium on Optical Materials for High Power Lasers, 2008, Boulder, Colorado, United States

Abstract

This paper deals with the relation between fracture mechanics and 355 nm laser damage at the surface of fused silica. It is organized in 3 parts. First, we discuss about the link between cracks and laser initiation of surface damage. A 1D model was proposed last year to explain how a nanometer wide, clean, uncontaminated crack could trigger a macroscopic damage event. Here, using the model, we try to express a damage criterion able to reproduce experimental features. In a second part, we consider the relationship between laser damage and mechanical damage by indents or impacts. From Auerbach's law, it is straightforward to derive an energy density threshold for Hertzian crack initiation. With the laser fracture interaction model, a laser fluence threshold of cone crack formation can be calculated. When cone cracks are present, a series of shot at moderate fluence will increase their length exponentially. This is a possible explanation for exponential damage growth at the exit surface of fused silica.

Citation Download Citation

H. Bercegol and P. Grua "Fracture related initiation and growth of surface laser damage in fused silica", Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 71321B (30 December 2008); https://doi.org/10.1117/12.804419

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