Focal plane wave-front sensing algorithm for high-contrast imaging
Abstract
High-contrast imaging provided by a coronagraph is critical for the direction imaging of the Earth-like planet orbiting its bright parent star. A major limitation for such direct imaging is the speckle noise that is induced from the wave-front error of an optical system. We derive an algorithm for the wave-front measurement directly from 3 focal plane images. The 3 images are achieved through a deformable mirror to provide specific phases for the optics system. We introduce an extra amplitude modulation on one deformable mirror configuration to create an uncorrelated wave-front, which is a critical procedure for wave-front sensing. The simulation shows that the reconstructed wave-front is consistent with the original wave-front theoretically, which indicates that such an algorithm is a promising technique for the wave-front measurement for the high-contrast imaging.
- Publication:
-
Science in China: Physics, Mechanics and Astronomy
- Pub Date:
- August 2009
- DOI:
- 10.1007/s11433-009-0158-2
- arXiv:
- arXiv:1510.03791
- Bibcode:
- 2009ScChG..52.1284D
- Keywords:
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- high-contrast imaging;
- multi-image algorithm;
- speckle nulling technique;
- wave-front sensing;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- 5 pages, 3 figures