Masking technique for coating thickness control on large and strongly curved aspherical optics

Abstract : This paper discusses a method to control the coating thickness deposited onto large and strongly curved optics by ion beam sputtering. The technique uses an original design of the mask used to screen part of the sputtered materials. A first multi-element mask is calculated from the measured 2D coating thickness distribution. Then, by means of an iterative process the final mask is designed. By using such a technique, it has been possible to deposit layers of tantalum pentoxide having a high thickness gradient onto a curved substrate 500 mm in diameter. Residual errors in the coating thickness profile are below 0.7%.
Type de document :
Article dans une revue
Applied optics, Optical Society of America, 2009, 46, pp.3760-3765. <10.1364/AO.48.003760>


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Soumis le : jeudi 17 septembre 2009 - 16:23:09
Dernière modification le : mercredi 23 septembre 2009 - 11:49:09

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B. Sassolas, R. Flaminio, J. Franc, Christine Michel, J.-L. Montorio, et al.. Masking technique for coating thickness control on large and strongly curved aspherical optics. Applied optics, Optical Society of America, 2009, 46, pp.3760-3765. <10.1364/AO.48.003760>. <in2p3-00418223>

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