System and method for imaging with extended depth of focus and incoherent light
An optical arrangement is provided for use in imaging with a large depth of focus. The optical arrangement comprises an aperture unit, and a replication unit. The replication unit is configured for producing a plurality of replicas of an input optical field passed through the aperture unit such that the replicas include at least two replicas that are of substantially the same phase distribution and are created at different regions of the aperture unit plane.
1. An optical arrangement for use in imaging with a large depth of focus, said optical arrangement comprising an
aperture unit, and
a replication unit configured for providing a plurality of replicas of an input optical field such that said replicas include at least two replicas that are of substantially the same phase distribution and are created at different regions of the aperture unit plane.
2. The optical arrangement of claim 1 , wherein said replication unit comprises at least first and second symmetrizing units configured for providing the at least two replicas of the input optical field while sequentially symmetrizing the input optical field projected on said aperture unit with respect to first and second centers of symmetry, respectively.
3. The optical arrangement of claim 2 , wherein said first symmetrizing unit is configured for symmetrizing a portion of a chirp of the input optical field passed through said aperture unit, and said second symmetrizing unit is configured for symmetrizing an output of said first symmetrizing unit.
4. The optical arrangement of claim 2 , wherein the aperture unit and the first and second symmetrizing units are configured such that at least one of the replicas is displaceable with respect to the other.
5. The optical arrangement of claim 4 , comprising a scanner, configured and operable to provide said displacement of at least one of the replicas by providing a relative displacement of at least one of the aperture unit and said first symmetrizing unit with respect to the second symmetrizing unit.
6. The optical arrangement of claim 1 , wherein the replication unit comprises reflective surfaces.
7. The optical arrangement of claim 1 , wherein said reflective surfaces are formed by at least first and second reflector units accommodated in a spaced-apart relationship along an optical axis of light propagation through the optical arrangement towards an imaging plane.
8. The optical arrangement of claim 7 , wherein each of the first and second reflector units comprises two reflectors defining mutually perpendicular reflective surfaces such that the reflective surface of the first reflector unit are substantially parallel to the respective reflective surfaces of the second reflector unit.
9. The optical arrangement of claim 1 , wherein the replication unit comprises at least one of the following: an array of optical fibers, a spatial light modulator, and one or more corner prisms.
10. The arrangement of claim 1 , wherein said aperture unit comprises a random plate.
11. The optical arrangement of claim 1 , comprising a pixel detector array in an imaging plane.
12. A method for use in imaging to provide imaging with a large depth of focus, the method comprising
passing an input optical field to be imaged through an aperture plate, and
optically processing the optical field passed through the aperture plate to produce a plurality of replicas of said optical field such that said replicas include at least two replicas that are of substantially the same phase distribution and are created at different regions of the aperture plane.