Piston and tilt interferometry for segmented wavefront sensing

We present a novel interferometric technique dedicated to the measurement of relative phase differences (pistons) and tilts of a periodically segmented wavefront. Potential applications include co-phasing of segmented mirrors of Keck-like telescopes as well as coherent laser beam combining. The setu...

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Bibliographic Details
Published in:Optics letters 2016-03, Vol.41 (6), p.1078-1081
Main Authors: Deprez, M, Bellanger, C, Lombard, L, Wattellier, B, Primot, J
Format: Article
Language:English
Subjects:
Camber
Diffraction
Engineering Sciences
Interferometry
Optics
Pattern analysis
Photonic
Pistons
Segmented mirrors
Tilt
Wave fronts
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Summary:We present a novel interferometric technique dedicated to the measurement of relative phase differences (pistons) and tilts of a periodically segmented wavefront. Potential applications include co-phasing of segmented mirrors of Keck-like telescopes as well as coherent laser beam combining. The setup only requires a holes mask selecting the center part of each element, a diffracting component, and a camera. Recorded interferogram is made of many subareas with sinusoidal fringe pattern. From each pattern, piston is extracted from fringe shift and tilts from fringe frequency and orientation. The pattern analysis is simple enough to enable kilohertz rate operation. The λ ambiguities are solved by a two-wavelength measurement. This technique is compatible with a very high number of elements and can be operated in the presence of atmospheric turbulence.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.41.001078