System and methods for shearless hologram acquisition
US7936490B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 2007 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | Aug 16, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2223/13
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Systems and methods for shearless digital hologram acquisition, including an apparatus incorporating an illumination source configured to produce a first beam of light, which is then split by a beamsplitter into a reference beam and an object illumination beam. The reference beam is directed onto a phase-shaping optical element which imparts a phase shift to the reference beam and returns the phase-shifted reference beam on itself to the beamsplitter. The object illumination beam is directed onto an object, and a portion of the beam is reflected back to the beamsplitter, which combines the phase-shifted reference beam and object illumination beam substantially coaxially. The combined beams are passed through a focusing lens which focuses them at a focal plane. A digital recorder is positioned at the focal plane to record the spatially heterodyne hologram formed by the focused phase-shifted reference beam and reflected object illumination beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.