Catastrophic failure of contaminated fused silica optics at 355 nm

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For years, contamination has been known to degrade the performance of optics and to sometimes initiate laser-induced damage to initiate. This study has W to quantify these effects for fused silica windows used at 355 mm Contamination particles (Al, Cu, TiO{sub 2} and ZrO{sub 2}) were artificially deposited onto the surface and damage tests were conducted with a 3 ns NdYAG laser. The damage morphology was characterized by Nomarski optical microscopy. The results showed that the damage morphology for input and output surface contamination is different. For input surface contamination, both input and output surfaces can damage. In particular, the ... continued below

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12 pages; Other: FDE: PDF

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Genin, F. Y., LLNL December 3, 1996.

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Description

For years, contamination has been known to degrade the performance of optics and to sometimes initiate laser-induced damage to initiate. This study has W to quantify these effects for fused silica windows used at 355 mm Contamination particles (Al, Cu, TiO{sub 2} and ZrO{sub 2}) were artificially deposited onto the surface and damage tests were conducted with a 3 ns NdYAG laser. The damage morphology was characterized by Nomarski optical microscopy. The results showed that the damage morphology for input and output surface contamination is different. For input surface contamination, both input and output surfaces can damage. In particular, the particle can induce pitting or drilling of the surface where the beam exits. Such damage usually grows catastrophically. Output surface contamination is usually ablated away on the shot but can also induce catastrophic damage. Plasmas are observed during illumination and seem to play an important role in the damage mechanism. The relationship between fluence and contamination size for which catastrophic damage occurred was plotted for different contamination materials. The results show that particles even as small as 10 {micro}m can substantially decrease the damage threshold of the window and that metallic particles on the input surface have a more negative effect than oxide particles.

Physical Description

12 pages; Other: FDE: PDF

Notes

OSTI as DE00016372

Source

  • 2nd Annual International Conference on Solid-State Lasers for Applications to Inertial Confinement Fusion, Paris (FR), 10/22/1996--10/25/1996; Other Information: Supercedes report DE98050991; PBD: 03 Dec 96

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  • Other: DE98050991
  • Report No.: UCRL-JC-125417
  • Report No.: CONF-9610225--
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 16372
  • Archival Resource Key: ark:/67531/metadc618339

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 3, 1996

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 3, 2017, 1:50 p.m.

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Genin, F. Y., LLNL. Catastrophic failure of contaminated fused silica optics at 355 nm, article, December 3, 1996; (digital.library.unt.edu/ark:/67531/metadc618339/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.