Wavefront sensing for Themis: a case study for next generation solar telescopes like EST .
Abstract
Wavefront sensing is one of the most challenging problem in solar Adaptive Optics (AO) due to the presence of extended and low contrast AO-targets on the solar scene. We show preliminary results of wavefront modal phase estimation on THEMIS Solar Telescope data, using two approaches: Zernike (ZE) and Karhunen-Loeve (K-L) polynomial expansions. We have analyzed Shack-Hartmann (SH) dataset, and the wavefront phases were reconstructed. A study of pros and cons of the two different modal expansions has been carried out. These results could be particularly helpful in developing and studying design and performances for next generation solar telescopes based upon annular pupils.
- Publication:
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Memorie della Societa Astronomica Italiana
- Pub Date:
- 2009
- Bibcode:
- 2009MmSAI..80..293S
- Keywords:
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- Instrumentation: adaptive optics;
- Techniques: high angular resolution