Special Section on Laser Damage III

CO2 laser microprocessing for laser damage growth mitigation of fused silica optics

[+] Author Affiliations
Thomas Doualle, Laurent Gallais, Serge Monneret

Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France

Stephane Bouillet, Antoine Bourgeade, Christel Ameil, Laurent Lamaignère, Philippe Cormont

CEA-CESTA, F-33116 Le Barp, France

Opt. Eng. 56(1), 011022 (Oct 17, 2016). doi:10.1117/1.OE.56.1.011022
History: Received June 1, 2016; Accepted September 19, 2016
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Abstract.  We report on the development of a mitigation process to prevent the growth of UV nanosecond laser-initiated damage sites under successive irradiations of fused silica components. The developed process is based on fast microablation of silica as it has been proposed by Bass et al. [Bass et al., Proc. SPIE 7842, 784220 (2010)]. This is accomplished by the displacement of the CO2 laser spot with a fast galvanometer beam scanner to form a crater with a typical conical shape to mitigate large (millimetric) and deep (few hundred microns) damage sites. We present the developed experimental system and process for this application. Particularly, we detail and evaluate a method based on quantitative phase imaging to obtain fast and accurate three-dimensional topographies of the craters. The morphologies obtained through different processes are then studied. Mitigation of submillimetric nanosecond damage sites is demonstrated through different examples. Experimental and numerical studies of the downstream intensifications, resulting in cone formation on the surface, are presented to evaluate and minimize the downstream intensifications. Eventually, the laser damage test resistance of the mitigated sites is evaluated at 355, 2.5 ns, and we discuss on the efficiency of the process for our application.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Thomas Doualle ; Laurent Gallais ; Serge Monneret ; Stephane Bouillet ; Antoine Bourgeade, et al.
"CO2 laser microprocessing for laser damage growth mitigation of fused silica optics", Opt. Eng. 56(1), 011022 (Oct 17, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011022


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