White light interferometry: a method for coarse phasing segmented telescopes without dedicated hardware

Mitchell Troy; Siddarayappa Bikkannavar; Andrew G. Kee; Catherine Ohara; Carl Nissly; Phillip K. Poon; David Redding; Lewis C. Roberts; Jonathan Tesch

doi:10.1117/12.3017676

23 August 2024 White light interferometry: a method for coarse phasing segmented telescopes without dedicated hardware

Mitchell Troy, Siddarayappa Bikkannavar, Andrew G. Kee, Catherine Ohara, Carl Nissly, Phillip K. Poon, David Redding, Lewis C. Roberts, Jonathan Tesch

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130925R (2024) https://doi.org/10.1117/12.3017676
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Current approaches for phasing of segmented space telescopes have required complex dedicated optics and mechanisms, such as Dispersed Hartmann sensors or grisms. These methods do not scale well as the number of segments increases. The broadband phasing approach used at the Keck Observatory does scale well and can work on space telescopes without the need for any additional hardware. We show that this method implemented as white light interferometry (WLI), using a standard imaging detector and filters, has a capture range limited only by the range of the segment actuators and can easily phase the mirrors to within the capture range of single wavelength phasing methods. An analysis of the Keck broadband phasing performance is presented and used to develop a formula for implementation of WLI on other segmented telescopes. As an example, a WLI implementation for the NASA Habitable Worlds Observatory telescope is developed and demonstrated via detailed wave-optics simulations. The implementation, performance and limitations of the proposed WLI method are discussed in detail in the paper.

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

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Mitchell Troy, Siddarayappa Bikkannavar, Andrew G. Kee, Catherine Ohara, Carl Nissly, Phillip K. Poon, David Redding, Lewis C. Roberts, and Jonathan Tesch "White light interferometry: a method for coarse phasing segmented telescopes without dedicated hardware", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130925R (23 August 2024); https://doi.org/10.1117/12.3017676

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