Phased array of computer generated holograms for waveform or surface measurement
AssigneeExelis, Inc.
InventorsEugene Olczak, Cormic Merle, Greg Burdick
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Abstract
An apparatus for testing an optical surface comprising an array of holograms. The array includes a plurality of individual holograms arranged in an M×N format, in which M is the number of rows and N is the number of columns in the array. The array of holograms is positioned between the optical surface and a wavefront sensor. The array of holograms reflects a reference beam back to the wavefront sensor, and transmits a test beam to the optical surface. The array of holograms also receives the test beam reflected from the optical surface and transfers the test beam back to the wavefront sensor.
Claims23
An apparatus for testing an optical surface comprising:
- an array of holograms, the array including a plurality of individual holograms arranged in an M×N format, in which M is the number of rows and N is the number of columns in the array, and
- the array of holograms positioned between the optical surface and a wavefront sensor,
- wherein the array of holograms reflects a reference beam back to the wavefront sensor, and transmits a test beam to the optical surface, and
- the array of holograms receives the test beam reflected from the optical surface and transfers the test beam back to the wavefront sensor.
An apparatus for testing an optical surface comprising:
- an array of holograms, the array including a plurality of individual holograms arranged in a two-dimensional matrix format;
- and
- at least a portion of the array of holograms is illuminated by an incident beam from a wavefront sensor positioned above the array;
- wherein
- the array of holograms modifies the incident beam to a reference beam and reflects back the reference beam to the wavefront sensor;
- and further modifies the incident beam to a test beam impinging on the optical surface positioned below the array of holograms.
A method for testing an optical surface comprising the steps of:
- directing an incident beam from a wavefront sensor toward an array of holograms, the array including a plurality of individual holograms arranged in a two-dimensional matrix format;
- illuminating at least a portion of the array of holograms;
- modifying the incident beam by the array of holograms to produce a reference beam and a test beam;
- reflecting the reference beam from the array of holograms to the wavefront sensor;
- and
- impinging the test beam on the optical surface and reflecting the test beam back to the wavefront sensor.
Dependencies are inferred from the claim text.