Large diopter range real time sequential wavefront sensor
Example embodiments of a large dynamic range sequential wavefront sensor for vision correction or assessment procedures are disclosed. An example embodiment includes first and second optically coupled 4F relays and a variable focus lens disposed substantially at the image plane of the first 4F relay and the object plane of the second 4F relay.
1. A large diopter range sequential wavefront sensor for vision correction procedures comprising:
an optical wavefront relay system including first and second lenses, each lens having a diameter, a focal length and an optical axis, with the optical wavefront relay system configured to relay an incident wavefront from an object plane in an object space to a wavefront image plane in a wavefront image space along a beam path where the focal lengths and diameters of the first and second lenses are selected to guide an incident wavefront beam having a large diopter range from the object plane to the wavefront image plane;
a controllable beam shifting element positioned in the wavefront image space between the second lens and the wavefront image plane and configured to intercept substantially an entire incident wavefront beam in the wavefront image space and to controllably transversely shift an intercepted incident wavefront beam;
a sampling aperture positioned at or near the wavefront image plane and configured to sample the controllably shifted intercepted incident wavefront beam;
a sub-wavefront focusing lens disposed before or after the sampling aperture configured to focus the controllably shifted and sampled intercepted incident wavefront beam to an image spot onto a focal plane;
a quadrant image spot position sensing device positioned at the focal plane, with the quadrant image spot position sensing device including four quadrants and with the ratios of portions of the image spot incident on each quadrant indicating the tilt of the controllably shifted and sampled intercepted incident wavefront beam; and
a diffuser positioned between the sub-wavefront focusing lens and the quadrant image spot position sensing device, where the sub-wavefront focusing lens focuses the controllably shifted intercepted and sampled incident wavefront beam to an image spot on the diffuser which enlarges the image spot to assure that the image spot when reaching the quadrant image spot position sensing device is shared by all quadrants of the quadrant image spot position sensing device.
2. A wavefront sensor for vision correction procedures comprising:
an optical wavefront relay system configured to relay an incident wavefront from an object plane to a wavefront image plane;
a sampling aperture positioned at or near the wavefront image plane and configured to sample the incident wavefront beam;
a sub-wavefront focusing lens disposed before or after the aperture configured to focus the sampled incident wavefront beam to an image spot on a focal plane;
a quadrant image spot position sensing device positioned at the focal plane, with the quadrant image spot position sensing device including four quadrants and with the ratios of portions of the image spot incident on each quadrant indicating the tilt of the sampled incident wavefront beam; and
a diffuser positioned between the sub-wavefront focusing lens and the quadrant image spot position sensing device, where the sub-wavefront focusing lens focuses the sampled incident wavefront beam to an image spot on the diffuser which enlarges the image spot to assure that the image spot when reaching the quadrant image spot position sensing device is shared by all quadrants of the quadrant image spot position sensing device.
3. A large diopter range sequential wavefront sensor for vision correction or assessment procedures comprising:
a first optical wavefront relay system including first and second lenses, each lens having a diameter, a focal length and an optical axis, with the first optical wavefront relay system configured to relay an incident wavefront from a first object plane in a first object space to a first wavefront image plane in a first wavefront image space along a first beam path where the focal lengths and diameters of the first and second lenses are selected to guide an incident wavefront relay beam having a large diopter range from the first object plane to the first wavefront image plane;
a second optical wavefront relay system including third and fourth lenses, each lens having a diameter, a focal length and an optical axis, with the second optical wavefront relay system having a second object plane in a second object space that is substantially at the first wavefront image plane, and configured to further relay the incident wavefront from the first wavefront image plane to a second wavefront image plane in a second wavefront image space along a second optical path, with the third lens configured to guide the relayed incident wavefront beam to a Fourier transform plane located between the third and fourth lenses;
a reflective beam shifting element disposed substantially at the Fourier transform plane located between the third and fourth lenses, positioned along the optical axis of the third lens to intercept substantially the entire relayed incident wavefront beam over a desired large diopter range and oriented to fold the second optical path at a folding angle having a magnitude that prevents a reflected wavefront beam from being intercepted by the third lens;
a sampling aperture positioned at or near the second wavefront image plane and configured to sample the intercepted incident wavefront beam;
a sub-wavefront focusing lens disposed before or after the sampling aperture configured to focus the intercepted and sampled incident wavefront beam to an image spot onto a focal plane;
a quadrant image spot position sensing device positioned at the focal plane, with the quadrant image spot position sensing device including four quadrants and with the ratios of portions of the image spot incident on each quadrant indicating the tilt of the intercepted and sampled incident wavefront beam; and
a diffuser positioned between the sub-wavefront focusing lens and the quadrant image spot position sensing device, where the sub-wavefront focusing lens focuses the intercepted and sampled incident wavefront beam to an image spot on the diffuser which enlarges the image spot to assure that the image spot when reaching the quadrant image spot position sensing device is shared by all quadrants of the quadrant image spot position sensing device.