Dr. Torsten Erbe Profile

Dr. Torsten Erbe

at JENOPTIK Optical Systems GmbH

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Proceedings Article | 23 September 2015 Paper

Lens-mount stability trade-off: a survey exemplified for DUV wafer inspection objectives

Achmed Bouazzam, Torsten Erbe, Stephan Fahr, Jan Werschnik

Proceedings Volume 9626, 96261E (2015) https://doi.org/10.1117/12.2191511

KEYWORDS: Optical components, Tolerancing, Objectives, Deep ultraviolet, Inspection, Adhesives, Optical design, Optical mounts, Assembly tolerances, Polarization

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The position stability of optical elements is an essential part of the tolerance budget of an optical system because its compensation would require an alignment step after the lens has left the factory. In order to achieve a given built performance the stability error contribution needs to be known and accounted for. Given a high-end lens touching the edge of technology not knowing, under- or overestimating this contribution becomes a serious cost and risk factor. If overestimated the remaining parts of the budget need to be tighter. If underestimated the total project might fail. For many mounting principles the stability benchmark is based on previous systems or information gathered by elaborated testing of complete optical systems. This renders the development of a new system into a risky endeavour, because these experiences are not sufficiently precise and tend to be not transferable when scaling of the optical elements is intended. This contribution discusses the influences of different optical mounting concepts on the position stability using the example of high numerical aperture (HNA) inspection lenses working in the deep ultraviolet (DUV) spectrum. A method to investigate the positional stability is presented for selected mounting examples typical for inspection lenses.

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