System and methods for shearless hologram acquisition

Details System and methods for shearless hologram acquisition System and methods for shearless hologram acquisition

2007-10-30

2007-10-30

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

C359S009000, C356S457000

Reexamination Certificate

active

11272539

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.

REFERENCES:
patent: 6747771 (2004-06-01), Thomas et al.
patent: 6809845 (2004-10-01), Kim et al.
patent: 7068375 (2006-06-01), Voelkl
patent: 2003/0016364 (2003-01-01), Thomas et al.
patent: 2006/0181714 (2006-08-01), Mater et al.

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