Actions for Study of CO2 laser smoothing of surface roughness in fused silica [electronic resource].
Study of CO2 laser smoothing of surface roughness in fused silica [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Energy, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- PDF-file: 8 pages; size: 1.8 Mbytes
- Additional Creators
- Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- Small micrometer-sized roughness on optical surfaces, caused by laser damage and/or redeposition of laser ablated material, can cause local electric field intensification which may lead to damage initiation both on the optics and/or downstream. We examined the smoothing of etched periodic surface structures on SiO₂ substrate with 10.6 {micro}m CO₂ laser using atomic force microscopy. The characteristic surface tension driven mass flow of the glass under different laser parameters were simulated using computational fluid dynamics and correlated with experimental results. We found that during CO₂ laser polishing the estimate viscosity of the silica glass appears to be higher than typical literature values measured at a temperature similar to the laser heating conditions. This discrepancy can be explained by the observation that at high temperature, a significant portion of the hydroxyl content in the layer of heated silica glass can diffuse out resulting in a much stiffer glass.
- Report Numbers
- E 1.99:llnl-proc-420985
llnl-proc-420985 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
11/03/2009.
"llnl-proc-420985"
Presented at: Boulder Damage Symposium, Boulder, CO, United States, Sep 21 - Sep 23, 2009.
Matthews, J; Yang, T; Cooke, D; Fair, J E; Nguyen, H T; Britten, J A; Henshaw, D; Shen, N; Guss, G M; Elhadj, S. - Funding Information
- W-7405-ENG-48
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