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Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics

Dubost, Nicolás; Bharmal, Nazim Ali; Dubbeldam, Marc; Myers, Richard M.

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Authors

Nicolás Dubost

Marc Dubbeldam



Abstract

The direct detection and imaging of exoplanets requires the use of high-contrast adaptive optics (AO). In these systems quasi-static aberrations need to be highly corrected and calibrated. To achieve this, the pupil-modulated point-diffraction interferometer (m-PDI) was presented in an earlier paper. This present paper focuses on m-PDI concept validation through three experiments. First, the instrument’s accuracy and dynamic range are characterized by measuring the spatial transfer function at all spatial frequencies and at different amplitudes. Then, using visible monochromatic light, an AO control loop is closed on the system’s systematic bias to test for precision and completeness. In a central section of the pupil with 72% of the total radius, the residual error is 7.7 nm rms. Finally, the control loop is run using polychromatic light with a spectral FWHM of 77 nm around the R-band. The control loop shows no drop in performance with respect to the monochromatic case, reaching a final Strehl ratio larger than 0.7.

Citation

Dubost, N., Bharmal, N. A., Dubbeldam, M., & Myers, R. M. (2022). Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics. Applied Optics, 61(14), 4160-4167. https://doi.org/10.1364/ao.439569

Journal Article Type Article
Acceptance Date Mar 30, 2022
Online Publication Date May 9, 2022
Publication Date 2022
Deposit Date May 10, 2022
Publicly Available Date Jul 19, 2022
Journal Applied Optics
Print ISSN 1559-128X
Electronic ISSN 2155-3165
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 61
Issue 14
Pages 4160-4167
DOI https://doi.org/10.1364/ao.439569

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.







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