Laser conditioning methods of hafnia-silica multilayer mirrors

Christopher J. Stolz; Lynn Matthew Sheehan; Stephen M. Maricle; Sheldon Schwartz; Jean Hue

doi:10.1117/12.344419

7 April 1999 Laser conditioning methods of hafnia-silica multilayer mirrors

Christopher J. Stolz, Lynn Matthew Sheehan, Stephen M. Maricle, Sheldon Schwartz, Jean Hue

Proceedings Volume 3578, Laser-Induced Damage in Optical Materials: 1998; (1999) https://doi.org/10.1117/12.344419
Event: Laser-Induced Damage in Optical Materials: 1998, 1998, Boulder, CO, United States

Abstract

A variety of 1064-nm laser conditioning methods were investigated to find the optimum method for production of large aperture (0.25 m2) multilayer coatings for the National Ignition Facility and Laser MegaJoule. Two conditioning methods were explored, multi-step and single-step on two different laser systems. Off-line conditioning was done on PLATO, a small beam diameter ('-1 mm) raster scanning system. On-line conditioning was done on Beamlet, a single beam prototype of the National Ignition Facility with a large rectangular beam (35 cm x 35 cm). Concurrent with this work, coating process development for low-defect density high damage threshold coatings was realized by switching from hafnia to hafnium starting materials. The results of this study suggest that single-step raster-scan off-line laser conditioning is an effective method to raise the damage threshold of multilayer mirrors deposited from hafnium and silica by reactive electron beam deposition.

Citation Download Citation

Christopher J. Stolz, Lynn Matthew Sheehan, Stephen M. Maricle, Sheldon Schwartz, and Jean Hue "Laser conditioning methods of hafnia-silica multilayer mirrors", Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); https://doi.org/10.1117/12.344419

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