Phasing a small deployable optical space telescope using focal-plane wavefront sensing

Noah Schwartz; Éamonn Harvey; Samuel Pinilla; Siu-Lun Yeung; Douglas Harvey; Jay Stephan; Junyi Zhou; Katherine Morris; Charlotte Z. Bond

doi:10.1117/12.3019886

23 August 2024 Phasing a small deployable optical space telescope using focal-plane wavefront sensing

Noah Schwartz, Éamonn Harvey, Samuel Pinilla, Siu-Lun Yeung, Douglas Harvey, Jay Stephan, Junyi Zhou, Katherine Morris, Charlotte Z. Bond

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130925Q (2024) https://doi.org/10.1117/12.3019886
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

A-DOT (Active Deployable Optical Telescope) is a payload prototype project of a 6U segmented deployable telescope with an aperture diameter of 300 mm currently in the design phase. This paper investigates two different strategies for phasing a deployable segmented telescope. The first method employs a classical optimisation approach, where the image sharpness is used as the primary metric for aligning the mirror segments. This technique involves iteratively adjusting the individual segments' positions and orientations to maximise the resulting image's sharpness. The second method takes a more innovative approach by leveraging the power of deep learning techniques. Deep learning algorithms, trained on a large dataset of simulated images, can learn to recognise and correct phasing errors automatically. This approach can potentially streamline the phasing process and enhance the telescope's overall performance. Preliminary results from the study demonstrate the efficacy of both methods in achieving excellent phasing control. Remarkably, these techniques have successfully identified and corrected significant phasing errors, with path length differences of several microns, ultimately reducing the residual errors to the desired performance level using a point source, typically below 15 nm in the visible spectrum.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Noah Schwartz, Éamonn Harvey, Samuel Pinilla, Siu-Lun Yeung, Douglas Harvey, Jay Stephan, Junyi Zhou, Katherine Morris, and Charlotte Z. Bond "Phasing a small deployable optical space telescope using focal-plane wavefront sensing", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130925Q (23 August 2024); https://doi.org/10.1117/12.3019886

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