Abstract

We propose, through simulations and experiments, a wavefront reconstruction technique using a focus-tunable lens and 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 by different 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.

© 2015 Optical Society of America

Full Article  |  PDF Article
More Like This
All-in-focus image reconstruction under severe defocus

Julia R. Alonso, Ariel Fernández, Gastón A. Ayubi, and José A. Ferrari
Opt. Lett. 40(8) 1671-1674 (2015)

Volumetric structured illumination microscopy enabled by a tunable-focus lens

Taylor Hinsdale, Bilal H. Malik, Cory Olsovsky, Javier A. Jo, and Kristen C. Maitland
Opt. Lett. 40(21) 4943-4946 (2015)

Solid electrically tunable dual-focus lens using freeform surfaces and microelectro-mechanical-systems actuator

Yongchao Zou, Wei Zhang, Fook Siong Chau, and Guangya Zhou
Opt. Lett. 41(1) 1-4 (2016)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics