Complex wavefront reconstruction from multiple-image planes produced by a focus tunable lens

Fabián Mosso, Eduardo Peters, Darío G. Pérez*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We propose, through simulations and experiments, a wavefront reconstruction techniqueusing a focus-tunable lensand a phase-retrieval technique. A collimated beam illuminates a complex object (amplitude and phase), and a diffuser then modulates the outgoing wavefront. Finally the diffracted complex field reaches the focus-tunable lens, and a CMOS camera positioned at a fixed plane registers the subjective speckle distribution produced by the lens (one pattern for each focal length). We have demonstrated that a tunable lens can replace the translation stage used in the conventional single- beam, multiple-intensity reconstruction algorithm. In other words, through iterations with a modified version of this algorithm, the speckle images produced bydifferent focal lengths can be successfully employed to recover the initial complex object. With no movable elements, (speckle) image sampling can be performed at high frame rates, which is suitable for dynamical reconstruction applications.

Original languageEnglish
Pages (from-to)4623-4626
Number of pages4
JournalOptics Letters
Issue number20
StatePublished - 15 Oct 2015
Externally publishedYes

Bibliographical note

Funding Information:
CONICYT (FONDECYT 1100895, FONDECYT 3130433); PUCV (123.731/2014).

Publisher Copyright:
© 2015 Optical Society of America.


  • CMOS integrated circuits
  • Image processing
  • Image reconstruction
  • Microlenses
  • Speckle
  • Wavefronts


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