title: Adaptive optimisation of a generalised phase contrast beam shaping system.
abstract: The generalised phase contrast (GPC) method provides versatile and efficient light shaping for a range of applications. We have implemented a generalised phase contrast system that used two passes on a single spatial light modulator (SLM). Both the pupil phase distribution and the phase contrast filter were generated by the SLM. This provided extra flexibility and control over the parameters of the system including the phase step magnitude, shape, radius and position of the filter. A feedback method for the on-line optimisation of these properties was also developed. Using feedback from images of the generated light field, it was possible to dynamically adjust the phase filter parameters to provide optimum contrast.
authors.affiliation: Centre for Neural Circuits and Behaviour, University of Oxford, Mansfield Road, Oxford OX1 3SR, United Kingdom.
authors.forename: F
authors.initials: F
authors.lastname: Kenny
authors.affiliation: Centre for Neural Circuits and Behaviour, University of Oxford, Mansfield Road, Oxford OX1 3SR, United Kingdom.
authors.forename: F S
authors.initials: FS
authors.lastname: Choi
authors.affiliation: DTU Fotonik, Department of Photonics Engineering, Ørsted Plads 343, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Glückstad
authors.affiliation: Centre for Neural Circuits and Behaviour, University of Oxford, Mansfield Road, Oxford OX1 3SR, United Kingdom ; Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom.
authors.forename: M J
authors.initials: MJ
authors.lastname: Booth
keywords: Adaptive optics; Phase contrast; Spatial light modulators