Characterization of HR coatings for the Megajoule laser transport mirrors

Anne Fornier; C. Cordillot; D. Bernardino; O. Lam; Andre Roussel; B. Pinot; Bernard Geenen; Herve Leplan; W. Alexandre

doi:10.1117/12.294292

8 December 1997 Catastrophic failure of contaminated fused-silica optics at 355 nm

Anne Fornier, C. Cordillot, D. Bernardino, O. Lam, Andre Roussel, B. Pinot, Bernard Geenen, Herve Leplan, W. Alexandre

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294292
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

For years, contamination has been known to degrade the performance of optics and to sometimes initiate laser-induced damage to initiate. This study has started to quantify these effects for fused silica windows used at 355 nm. Contamination particles (Al, Cu, TiO₂ and ZrO₂) were artificially deposited onto the surface and damage tests were conducted with a 3 ns Nd:YAG 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 exists. Such damage usually grows catastrophically. Output surface contamination is usually ablated away on the first shot but can also induced 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 micrometers 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.

Citation Download Citation

Anne Fornier, C. Cordillot, D. Bernardino, O. Lam, Andre Roussel, B. Pinot, Bernard Geenen, Herve Leplan, and W. Alexandre "Catastrophic failure of contaminated fused-silica optics at 355 nm", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294292

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KEYWORDS

Laser damage threshold

Mirrors

Contamination

Particles

Scattering

Microscopes

Atomic force microscopy

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