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Optomechanical Coatings for High-Power Mirrors and Adaptive Optics

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Technical Report,01 Jul 2005,31 Dec 2008

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University of Minnesota, Office of Sponsored Projects Minneapolis United States

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The goals of this program were to develop optical coatings that can resist or circumvent the detrimental effects of thermal gradients. New thin film materials were investigated and optomechanical design techniques were developed. Over the three years of the program, we have made major progress on three main thrusts. These are I encapsulation techniques to stabilize the optical and mechanical properties of porous, reactive, or unstable thin films, 2 optomechanical design to create optical coatings with specified thermal and mechanical deformation, 3 negative thermal expansion NTE films that are stable with changing atmospheres. In addition we have preliminary results regarding two additional areas of inquiry that could have great impact on the coatings for high power lasers. These are 4 infrared signatures to predict the onset of laser damage to optical coatings, and 5 atomic layer deposition for highly conformal coatings for high power beam combining.

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