Simultaneous sub-aperture wavefront sensing with holographic aperture masking improves calibration

Jordan M. Stone; Henrique Schmitt; Freddie Santiago; S. Noor Qadri; Ellyn Baines

doi:10.1117/12.3018394

28 August 2024 Simultaneous sub-aperture wavefront sensing with holographic aperture masking improves calibration

Jordan M. Stone, Henrique Schmitt, Freddie Santiago, S. Noor Qadri, Ellyn Baines

Proceedings Volume 13095, Optical and Infrared Interferometry and Imaging IX; 130952T (2024) https://doi.org/10.1117/12.3018394
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Aperture masking is a technique to transform a filled-aperture telescope into an interferometer. One reason masks help boost sensitivity is that they facilitate the measurement of closure phases. Closure phases are insensitive to differential piston in the wavefront of light captured by each subaperture, so are a precise observable encoding the structure of the observed object. Spatial structure in the wavefront of light over each subaperture biases visibilities and closure phases. All extant aperture masking data sets show residual closure phase dispersion after calibration larger than estimates based on photon-noise alone, suggesting time variable substructure in the wavefront is playing a role in limiting closure phase precision. We are developing a technique harnessing the capabilities of holographic aperture masks to multiplex subapertures to provide for simultaneous focal-plane wavefront sensing of each subaperture. This device can be used to measure the spatial structure of the wavefront, facilitating self-calibrating closure phases. We will present the results of simulations demonstrating the concept and describe a prototype instrument design.

Citation Download Citation

Jordan M. Stone, Henrique Schmitt, Freddie Santiago, S. Noor Qadri, and Ellyn Baines "Simultaneous sub-aperture wavefront sensing with holographic aperture masking improves calibration", Proc. SPIE 13095, Optical and Infrared Interferometry and Imaging IX, 130952T (28 August 2024); https://doi.org/10.1117/12.3018394

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