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Rolled edges and phasing of segmented telescopes |
Applied Optics, Vol. 50, Issue 4, pp. 542-553 (2011)
http://dx.doi.org/10.1364/AO.50.000542
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Abstract
To achieve the diffraction limit, the segments in a segmented telescope must be correctly aligned to a fraction of a wavelength. This alignment is performed via optical measurements using starlight. We investigate the piston degree of freedom or phasing of the segments and the impact of rolled segment edges on the accuracy of the optical alignment. Three models for edge profiles are developed and fit to data from optic manufacturers. These profiles are then used, along with a simplified model of a Shack–Hartmann optical sensor, to determine their impact on phasing accuracy. The results can help estimate the residual phasing error and set requirements on segment polishing.
© 2011 Optical Society of America
OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(220.1140) Optical design and fabrication : Alignment
(220.5450) Optical design and fabrication : Polishing
(220.1080) Optical design and fabrication : Active or adaptive optics
ToC Category:
Optical Design and Fabrication
History
Original Manuscript: October 12, 2010
Revised Manuscript: December 13, 2010
Manuscript Accepted: December 13, 2010
Published: January 28, 2011
Citation
Natalia Yaitskova and Mitchell Troy, "Rolled edges and phasing of segmented telescopes," Appl. Opt. 50, 542-553 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-4-542
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