Incoherent digital holographic adaptive optics
An aberration-compensated image of an object field is created by generating a full-field complex hologram of the object field, generating a guide star complex hologram of a guide star selected from the object field, performing mathematical correlation between the guide star complex hologram and the full-field complex hologram, and generating from the correlation an aberration-compensated image of the object field from the correlation.
1. A system for generating aberration-compensated images, the system comprising:
an optical system that collects incoherent light from an object field;
an interferometer that receives the light collected by the optical system, the interferometer including a first mirror having a first radius of curvature, a second mirror having a second radius of curvature that is different from the first radius of curvature, a beam splitter configured to send copies of the received light to each of the mirrors, and a camera that receives light waves reflected by each of the mirrors and generates interferograms from the interfering light waves; and
a computing system that executes an aberration compensation program configured to receive the interferograms from the inteferometer and generate an aberration-compensated image of the object field based upon the interferograms.
2. The system of claim 1 , wherein the optical system is the optical system of a telescope.
3. The system of claim 1 , wherein the optical system is the optical system of a microscope.
4. The system of claim 1 , wherein the first mirror has a radius of curvature of approximately 1000 mm to infinity and the second mirror has a radius of curvature of approximately 1000 to 1200 mm.
5. The system of claim 1 , wherein the first mirror is planar and the second mirror has a focal length of approximately 500 to 600 mm.
6. The system of claim 1 , wherein the interferometer further comprises an actuator adapted to axially displace the first mirror along an optical axis of the interferometer.
7. The system of claim 6 , wherein the actuator is a piezoelectric actuator.
8. The system of claim 1 , wherein the interferometer further comprises an imaging lens positioned between the beam splitter and the camera.
9. The system of claim 1 , wherein the interferometer further comprises an interference filter positioned between the beam splitter and the camera.
10. The system of claim 1 , wherein the aberration compensation program comprises:
logic configured to generate a full-field complex hologram of the object field,
logic configured to generate a guide star complex hologram of a guide star selected from the object field,
logic configured to perform mathematical correlation between the guide star complex hologram and the full-field complex hologram, and
logic configured to generate from the correlation an aberration-compensated image of the object field.
11. The system of claim 10 , wherein the logic configured to generate a full-field complex hologram comprises logic configured to combine multiple raw interferograms of the object field to generate the full-field complex hologram.
12. The system of claim 11 , wherein the multiple raw interferograms of the object field comprise phase-shifted interferograms of the object field captured while displacing one of the mirrors along an optical axis of the interferometer.
13. The system of claim 10 , wherein the logic configured to generate a guide star complex hologram comprises logic configured to combine multiple raw interferograms of the guide star to generate the guide star complex hologram.
14. The system of claim 13 , wherein the multiple raw interferograms of the guide star comprise phase-shifted interferograms of the guide star captured while displacing one of the mirrors along an optical axis of the interferometer.
15. A system for generating aberration-compensated images, the system comprising:
an optical system that collects incoherent light from an object field;
an interferometer that receives the light collected by the optical system, the interferometer including a first mirror having a first radius of curvature, a second mirror having a second radius of curvature that is different from the first radius of curvature, a beam splitter configured to send copies of the received light to each of the mirrors, and a camera that receives light waves reflected by each of the mirrors and generates interferograms from the interfering light waves; and
a computing system that executes an aberration compensation program configured to receive the interferograms from the inteferometer and generate an aberration-compensated image of the object field based upon the interferograms, the program including logic configured to generate a full-field complex hologram of the object field, logic configured to generate a guide star complex hologram of a guide star selected from the object field, logic configured to perform mathematical correlation between the guide star complex hologram and the full-field complex hologram, and logic configured to generate from the correlation an aberration-compensated image of the object field.
16. The system of claim 15 , wherein the logic configured to generate a full-field complex hologram comprises logic configured to combine multiple raw interferograms of the object field to generate the full-field complex hologram.
17. The system of claim 16 , wherein the multiple raw interferograms of the object field comprise phase-shifted interferograms of the object field captured while displacing one of the mirrors along an optical axis of the interferometer.
18. The system of claim 15 , wherein the logic configured to generate a guide star complex hologram comprises logic configured to combine multiple raw interferograms of the guide star to generate the guide star complex hologram.
19. The system of claim 18 , wherein the multiple raw interferograms of the guide star comprise phase-shifted interferograms of the guide star captured while displacing one of the mirrors along an optical axis of the interferometer.