Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

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

Full text not available in this repository. (Request a copy from the Strathclyde author)

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.