Resolving piston ambiguities when phasing a segmented mirror

Mats G. Lofdahl; Henrik Eriksson

doi:10.1117/12.394013

28 July 2000 Resolving piston ambiguities when phasing a segmented mirror

Mats G. Lofdahl, Henrik Eriksson

Proceedings Volume 4013, UV, Optical, and IR Space Telescopes and Instruments; (2000) https://doi.org/10.1117/12.394013
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

Wavefront sensing in monochromatic light is insensitive to segment piston errors that are a whole number of waves. If the wavefront sensing is performed in several wavelengths, this ambiguity can be resolved. We give an algorithm for finding the correct phase, given multiple measurements in different wavelengths. Using this algorithm, the capture range of a wavefront sensor can be extended from on the order of +/- (lambda) /2 in piston to several waves. This relaxes the demands on an initial, coarse alignment method. The extended capture range depends on the selection of wavelengths available for phase measurements and the expected accuracy of the wavefront sensing method used.

Citation Download Citation

Mats G. Lofdahl and Henrik Eriksson "Resolving piston ambiguities when phasing a segmented mirror", Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); https://doi.org/10.1117/12.394013

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