Abstract

Substrate defect planarization has been shown to increase the laser resistance of 1053 nm mirror coatings to greater than 100J/cm2, an increase of 20-fold, when tested with 10 ns laser pulses. Substrate surface particles that are overcoated with optical interference mirror coatings become nodular defects, which behave as microlenses intensifying light into the defect structure. By a discrete process of angle-dependent ion etching and unidirectional ion-beam deposition, substrate defects can be reduced in cross-sectional area by over 90%.

© 2014 Optical Society of America

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