Gemini planet imager 2.0: implementing a Zernike wavefront sensor for non-common path aberrations measurement

V. Chambouleyron; M. Salama; C. E. Guthery; S. Perera; Q. Konopacky; J.-P. Veran; D. Savransky; J. Chilcote; J. K. Wallace; D. Dillon; R. Jensen-Clem; B. Macintosh

doi:10.1117/12.2676818

5 October 2023 Gemini planet imager 2.0: implementing a Zernike wavefront sensor for non-common path aberrations measurement

V. Chambouleyron, M. Salama, C. E. Guthery, S. Perera, Q. Konopacky, J.-P. Veran, D. Savransky, J. Chilcote, J. K. Wallace, D. Dillon, R. Jensen-Clem, B. Macintosh

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 1268002 (2023) https://doi.org/10.1117/12.2676818
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

GPI2.0 is an upgrade of the high-contrast instrument known as the Gemini Planet Imager (GPI). This new version is scheduled for installation on Gemini North telescope by the end of 2024. In this document, we outline our approach for addressing Non-Common Path Aberrations (NCPA) measurement and correction within the instrument. Our strategy differs significantly from the methods employed in the original GPI. Our proposal involves the utilization of a dedicated Wavefront Sensor (WFS) positioned within the coronagraph branch to accurately measure NCPAs. Subsequently, we will compensate for these aberrations by transmitting offset signals to the adaptive optics WFS. The chosen dedicated WFS will be a Zernike WFS (ZWFS), known for its exceptional sensitivity. This paper provides insights into the integration plan for incorporating the ZWFS into GPI2.0, details its key characteristics, and outlines the methodology for performing phase inversion based on the ZWFS measurements. Additionally, we present the initial results of experimental tests conducted on the SEAL testbed at the University of California, Santa Cruz (UCSC).

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V. Chambouleyron, M. Salama, C. E. Guthery, S. Perera, Q. Konopacky, J.-P. Veran, D. Savransky, J. Chilcote, J. K. Wallace, D. Dillon, R. Jensen-Clem, and B. Macintosh "Gemini planet imager 2.0: implementing a Zernike wavefront sensor for non-common path aberrations measurement", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 1268002 (5 October 2023); https://doi.org/10.1117/12.2676818

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