Implicit electric field conjugation for improved starlight rejection through a single-mode fiber

Joshua Liberman; Jorge Llop-Sayson; Arielle Bertrou-Cantou; Dimitri Mawet; A.J. Eldorado Riggs; Niyati Desai

doi:10.1117/12.2677532

5 October 2023 Implicit electric field conjugation for improved starlight rejection through a single-mode fiber

Joshua Liberman, Jorge Llop-Sayson, Arielle Bertrou-Cantou, Dimitri Mawet, A.J. Eldorado Riggs, Niyati Desai

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126802D (2023) https://doi.org/10.1117/12.2677532
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

Connecting a coronagraph instrument to a spectrograph via a single-mode optical fiber is a promising technique for characterizing the atmospheres of exoplanets with ground and space-based telescopes. However, due to the small separation and extreme flux ratio between planets and their host stars, instrument sensitivity will be limited by residual starlight leaking into the fiber. To minimize stellar leakage, we must control the electric field at the fiber input. Implicit Electric fFeld Conjugation (iEFC) is a model-independent wavefront control technique in contrast with classical Electric Field Conjugation (EFC) which requires a detailed optical model of the system. We present here the concept of an iEFC-based wavefront control algorithm to improve stellar rejection through a single-mode fiber. As opposed to image-based iEFC which relies on minimizing intensity in a dark hole region, our approach aims to minimize the amount of residual starlight coupling into a single-mode fiber. We present broadband simulation results demonstrating a normalized intensity ≥ 10⁻¹⁰ for both fiber-based EFC and iEFC. We find that both control algorithms exhibit similar performance for the low wavefront error case, however, iEFC outperforms EFC by ≈ 100x in the high wavefront error regime. Having no need for an optical model, this fiber-based approach is theoretically easier to implement than conventional EFC on future ground and space-based telescope missions.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Joshua Liberman, Jorge Llop-Sayson, Arielle Bertrou-Cantou, Dimitri Mawet, A.J. Eldorado Riggs, and Niyati Desai "Implicit electric field conjugation for improved starlight rejection through a single-mode fiber", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126802D (5 October 2023); https://doi.org/10.1117/12.2677532

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