Accelerated autofocusing of off-axis holograms using critical sampling

Fatih Toy M. F., Kühn J., Richard S., Parent J., Egli M., Depeursinge C.

Optics Letters, vol.37, no.24, pp.5094-5096, 2012 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 37 Issue: 24
  • Publication Date: 2012
  • Doi Number: 10.1364/ol.37.005094
  • Journal Name: Optics Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.5094-5096
  • Istanbul Medipol University Affiliated: No


In this Letter we propose a fast off-axis hologram autofocusing (AF) approach that is based on the redundant data elimination by the critical resampling of the contained complex field. Implementation of the proposed methodology enables the real-time AF with up to 12× speed-up factors in comparison to the classical approach. The method is further extended for single-shot physical autofocus of the fluorescence imaging channel of multimodal imaging instruments capable of off-axis hologram acquisition. © 2012 Optical Society of America.