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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Dynamic closed-loop system for focus tracking using a spatial light modulator and a deformable membrane mirror

Wright, A.J. and Poland, S.P. and Patterson, B.A. and Girkin, J.M. and Gibson, G.M. and Padgett, M.J. (2006) Dynamic closed-loop system for focus tracking using a spatial light modulator and a deformable membrane mirror. Optics Express, 14 (1). pp. 222-228. ISSN 1094-4087

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Abstract

A dynamic closed-loop method for focus tracking using a spatial light modulator and a deformable membrane mirror within a confocal microscope is described. We report that it is possible to track defocus over a distance of up to 80 µm with an RMS precision of 57 nm. For demonstration purposes we concentrate on defocus, although in principle the method applies to any wavefront shape or aberration that can be successfully reproduced by the deformable membrane mirror and spatial light modulator, for example, spherical aberration.