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Wavefront control for minimization of speckle coupling into a fiber injection unit based on the electric field conjugation algorithm

Llop Sayson, Jorge and Mawet, Dimitri and Ruane, Garreth and Delorme, Jacques-Robert and Echeverri, Daniel and Jovanovic, Nemanja and Klimovich, Nikita and Xin, Yeyuan (2018) Wavefront control for minimization of speckle coupling into a fiber injection unit based on the electric field conjugation algorithm. In: Adaptive Optics Systems VI. Proceedings of SPIE. No.10703. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1070372. ISBN 9781510619593. http://resolver.caltech.edu/CaltechAUTHORS:20190109-105316778

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Abstract

A fiber injection unit situated in the focal plane behind a coronagraph feeding a high resolution spectrograph can be used to couple light from an exoplanet to obtain high resolution spectra with improved sensitivity. However, the signal-to-noise ratio of the planet signal is limited by the coupling of starlight into the single mode fiber. To minimize this coupling, we need to apply a control loop on the stellar wavefront at the input of the fiber. We present here a wavefront control algorithm based on the formalism of the Electric Field Conjugation (EFC) controller that accounts for the effect of the fiber. The control output is the overlap integral of the electric field with the fundamental mode of a single mode fiber. This overlap integral is estimated by sending probes to a deformable mirror. We present results from simulations, and laboratory results obtained at the Caltech Exoplanet Technology Lab’s transmissive testbed. We show that our approach offers a significant improvement in starlight suppression through the fiber relative to a conventional EFC controller. This new approach improves the contrast of a high contrast instrument and could be used in future missions.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2313657DOIArticle
ORCID:
AuthorORCID
Mawet, Dimitri0000-0002-8895-4735
Ruane, Garreth0000-0003-4769-1665
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE).
Subject Keywords:High contrast imaging, Wavefront control, Wavefront sensing, Fiber injection unit, Electric Field Conjugation
Record Number:CaltechAUTHORS:20190109-105316778
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190109-105316778
Official Citation:Jorge Llop Sayson, Dimitri Mawet, Garreth Ruane, Jacques-Robert Delorme, Daniel Echeverri, Nemanja Jovanovic, Nikita Klimovich, Yeyuan Xin, "Wavefront control for minimization of speckle coupling into a fiber injection unit based on the electric field conjugation algorithm," Proc. SPIE 10703, Adaptive Optics Systems VI, 1070372 (12 July 2018); doi: 10.1117/12.2313657
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92164
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jan 2019 19:04
Last Modified:09 Jan 2019 19:04

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