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23 October 2019 Simulations of a high-contrast single-mode fiber coronagraphic multiobject spectrograph for future space telescopes
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Abstract

Directly imaging and characterizing Earth-like exoplanets is a tremendously difficult instrumental challenge. Present coronagraphic systems have yet to achieve the required 10  −  10 broadband contrast in a laboratory environment, but promising progress toward this goal continues. An approach to starlight suppression is the use of a single-mode fiber (SMF) behind a coronagraph. By using deformable mirrors to create a mismatch between incoming starlight and the fiber mode, SMF can be turned into an integral part of the starlight suppression system. We present simulation results of a system with five SMFs coupled to shaped pupil and vortex coronagraphs. We investigate the properties of the system, including its spectral bandwidth, throughput, and sensitivity to low-order aberrations. We also compare the performance of the SMF configuration with conventional imaging and multiobject modes, finding improved spectral bandwidth, raw contrast, background-limited signal-to-noise ratio, and demonstrate a wavefront control algorithm, which is robust to tip/tilt errors.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2019/$28.00 © 2019 SPIE
Carl T. Coker, Stuart B. Shaklan, A. J. Eldorado Riggs, and Garreth Ruane "Simulations of a high-contrast single-mode fiber coronagraphic multiobject spectrograph for future space telescopes," Journal of Astronomical Telescopes, Instruments, and Systems 5(4), 045003 (23 October 2019). https://doi.org/10.1117/1.JATIS.5.4.045003
Received: 11 April 2019; Accepted: 23 September 2019; Published: 23 October 2019
JOURNAL ARTICLE
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