
Proceedings Paper
A co-phasing technique for segmented mirror telescopesFormat | Member Price | Non-Member Price |
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Paper Abstract
In the new era of astronomy, we go for bigger telescopes having segmented primary and secondary mirrors. But once
segmentation is done, aligning and phasing mirror segments so that altogether they act like a monolithic mirror of a large
diameter, becomes critical. Co-phasing is a complex task that needed to be done after aligning the segments. Diffraction
limited resolution is only possible by a large segmented telescope, if mirror segments are co-phased. Co-phasing techniques
rely on physical optics and in one of the technique implemented in Keck telescope is based on analysis of diffraction pattern
generated by Shack Hartmann sensor. This same technique is being further explored by us in laboratory experimentation.
In this paper we present our effort to develop a simple but robust phasing technique for a large segmented mirror telescope
proposed to be installed in India. After rigorous mathematical exercise , analytical formulation for the phasing technique is
derived, which is further used to simulate in MATLAB. The MATLAB results are cross checked with the ZEMAX. There
after, a preliminary laboratory experiment has been conducted to check the feasibility of using this technique for phasing
segmented mirrors.
Paper Details
Date Published: 15 June 2015
PDF: 9 pages
Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96540G (15 June 2015); doi: 10.1117/12.2181778
Published in SPIE Proceedings Vol. 9654:
International Conference on Optics and Photonics 2015
Kallol Bhattacharya, Editor(s)
PDF: 9 pages
Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96540G (15 June 2015); doi: 10.1117/12.2181778
Show Author Affiliations
Annu Jacob, Indian Institute of Astrophysics (India)
Padmakar Parihar, Indian Institute of Astrophysics (India)
Published in SPIE Proceedings Vol. 9654:
International Conference on Optics and Photonics 2015
Kallol Bhattacharya, Editor(s)
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