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Extended-image-based correction of aberrations using a deformable mirror with hysteresis.
Optics Express
|November 25, 2018
Summary
We developed a guide-star-free aberration correction method for large space telescopes using a deformable mirror. Our study shows that controlling the mirror in two domains effectively compensates for hysteresis, improving image quality.
Area of Science:
- Optical engineering
- Astronomy instrumentation
Background:
- Next-generation large space telescopes require advanced aberration correction techniques.
- Guide-star-free methods are desirable for autonomous operation.
Purpose of the Study:
- To investigate guide-star-free, image-based aberration correction.
- To evaluate control algorithms for a unimorph deformable mirror.
Main Methods:
- Designed and built a high-resolution imaging testbed.
- Employed a heuristic hill climbing algorithm.
- Compared correction performance in voltage, Zernike, and singular mode domains.
Main Results:
- Successfully implemented guide-star-free aberration correction.
- Demonstrated that successive control in two domains counteracts deformable mirror hysteresis.
- Achieved improved image quality through systematic experimental study.
Conclusions:
- The developed method is effective for aberration correction in space telescopes.
- Dual-domain control is crucial for managing deformable mirror hysteresis.
- This approach advances autonomous optical system performance.
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