Document Detail


Investigation of stress induced by CO2 laser processing of fused silica optics for laser damage growth mitigation.
MedLine Citation:
PMID:  20052056     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Laser damage mitigation' is a process developed to prevent the growth of nanosecond laser-initiated damage sites under successive irradiation. It consists of re-fusing the damage area with a CO2 laser. In this paper we investigate the stress field created around mitigated sites which could have an influence on the efficiency of the process. A numerical model of CO2 laser interaction with fused silica is developed. It takes into account laser energy absorption, heat transfer, thermally induced stress and birefringence. Residual stress near mitigated sites in fused silica samples is characterized with specific photoelastic methods and theoretical data are compared to experiments. The stress distribution and quantitative values of stress levels are obtained for sites treated with the CO2 laser in various conditions of energy deposition (beam size, pulse duration, incident power). The results provided evidence that the presence of birefringence/residual stress around the mitigated sites has an effect on their laser damage resistance.
Authors:
Laurent Gallais; Philippe Cormont; Jean-Luc Rullier
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  17     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-01-06     Completed Date:  2010-03-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  23488-501     Citation Subset:  IM    
Affiliation:
Institut Fresnel, CNRS, Aix-Marseille Universit?, Ecole Centrale Marseille, Campus de Saint-J?r?me, 13013 Marseille, France. laurent.gallais@fresnel.fr
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MeSH Terms
Descriptor/Qualifier:
Dose-Response Relationship, Radiation
Lasers, Gas*
Radiation Dosage
Silicon Dioxide / chemistry*,  radiation effects*
Stress, Mechanical
Surface Properties / radiation effects
Chemical
Reg. No./Substance:
7631-86-9/Silicon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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