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PIAD low stress coating developments for LMJ deformable mirror

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Abstract

The deformable mirror of the Laser MegaJoule facility is made of a thin coated BK7 substrate requiring strict reflected wavefront specifications in a dry environment. To achieve these specifications, several PIAD coating conditions have been tested and the coating tooling has been optimized. Reflected wavefront results of coated full scale parts, and stress data on samples under various PIAD coating conditions are presented.

© 2013 Optical Society of America

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