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

A.J. Wright, S.P. Poland, B.A. Patterson, J.M. Girkin, G.M. Gibson, M.J. Padgett

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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.
Original languageEnglish
Pages (from-to)222-228
Number of pages6
JournalOptics Express
Volume14
Issue number1
DOIs
Publication statusPublished - Jan 2006

Keywords

  • atmospheric and oceanic optics
  • active or adaptive optics
  • microscopy
  • optical devices
  • mirrors
  • spatial light modulators

Cite this

Wright, A. J., Poland, S. P., Patterson, B. A., Girkin, J. M., Gibson, G. M., & 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), 222-228. https://doi.org/10.1364/OPEX.14.000222