Phasing the primary mirror segments of the Keck telescopes: a comparison of different techniques

Gary A. Chanan; Mitchell Troy; Catherine Mayumi Ohara

doi:10.1117/12.391510

20 July 2000 Phasing the primary mirror segments of the Keck telescopes: a comparison of different techniques

Gary A. Chanan, Mitchell Troy, Catherine Mayumi Ohara

Proceedings Volume 4003, Optical Design, Materials, Fabrication, and Maintenance; (2000) https://doi.org/10.1117/12.391510
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

We have developed and tested extensively three different methods for phasing the primary mirror segments of the Keck telescopes. Two of these, referred to as the broadband and narrowband algorithms respectively, are physical optics generalizations of the Shack-Hartmann technique. The third, Phase Discontinuity Sensing, is a physical optics generalization of curvature sensing. We evaluate and compare experimental results with these techniques with regard to capture range (as large as 30 micrometers ), run-to-run variation (as small as 6 nm), execution time (as short as twenty minutes), systematic errors, ease of implementation, and other factors, in the context of the Keck telescopes and also of future very large ground-based telescopes.

Citation Download Citation

Gary A. Chanan, Mitchell Troy, and Catherine Mayumi Ohara "Phasing the primary mirror segments of the Keck telescopes: a comparison of different techniques", Proc. SPIE 4003, Optical Design, Materials, Fabrication, and Maintenance, (20 July 2000); https://doi.org/10.1117/12.391510

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