Systems and methods for shear-corrected digital hologram acquisition

摘要

Systems and methods for shear-corrected digital hologram acquisition, wherein the shear-corrected geometry is highly suited for two (or more) color operation with either broadband or laser illumination. An apparatus for shear-corrected recording of a spatially heterodyne hologram with broad-band or laser illumination includes: an illumination source; a beamsplitter optically coupled to said illumination source(s); a reference beam corner-mirror pair for translation and phase-shaping of the object beam optically coupled to the beamsplitter; an object optically coupled to the beamsplitter; a focusing lens optically coupled to both the reference beam corner-mirror pair and the object; and a digital recorder optically coupled to the focusing lens. A reference beam is incident upon the translating and phase-shaping corner-mirror pair, and the reference beam and an object beam are focused by the focusing lens at a focal plane of the digital recorder to form a spatially heterodyne hologram.

主权项

1. An apparatus to record a hologram in a shear-corrected manner comprising:
an illumination source configured to produce a first beam of light; an object to be recorded; a beamsplitter configured to split the first beam into a reference beam, and an object illumination beam which interacts with said object; a focusing element configured to focus at a focal plane a portion of the object illumination beam which has interacted with said object; a phase shifting and shear-correcting optical element in the reference beam path only configured to correct the shear in the reference beam, impart a phase shift to the reference beam, and send the phase-shifted and shear-corrected reference beam to the focal plane so that the phase-shifted and shear-corrected reference beam substantially completely overlaps the object illumination beam at the focal plane; and an electronic digital recorder positioned substantially at the focal plane and configured to record a spatially heterodyne hologram formed by the phase-shifted and shear-corrected reference beam and the focused portion of the object illumination beam.