OPTICAL ELEMENTS WITH STRESS-BALANCING COATINGS
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United States of America Patent
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Issued Date -
Jan 25, 2018
app pub date -
Jul 11, 2017
filing date -
Jul 21, 2016
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Abstract
Optical elements with coatings having low surface figure are described. The optical element includes coatings on two or more surfaces. At least one of the coatings includes a stress-compensating layer. In the absence of the stress-compensating layer, the coatings are mismatched in stress. The difference in stress increases surface figure and distorts the wavefront of optical signals that are reflected and/or transmitted through the optical element. The stress-compensating layer acts to reduce mismatch in stress and leads to coatings with reduced surface figure and reduced distortion of wavefronts.
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