Experimental comparison of model-free and model-based dark hole algorithms for future space telescopes
arXiv (Cornell University)(2023)
摘要
Coronagraphic instruments provide a great chance of enabling high contrast
spectroscopy for the pursuit of finding a habitable world. Future space
telescope coronagraph instruments require high performing focal plane masks in
combination with precise wavefront sensing and control techniques to achieve
dark holes for planet detection. Several wavefront control algorithms have been
developed in recent years that might vary in performance depending on the
coronagraph they are paired with. This study compares 3 model-free and
model-based algorithms when coupled with either a Vector (VVC) or a Scalar
(SVC) Vortex Coronagraph mask in the same laboratory conditions: Pairwise
Probing with Electric Field Conjugation, the Self-Coherent Camera with Electric
Field Conjugation, and Implicit Electric Field Conjugation. We present
experimental results from the In-Air Coronagraph Testbed (IACT) at JPL in
narrowband and broadband light, comparing the pros and cons of each of these
wavefront sensing and control algorithms with respect to their potential for
future space telescopes.
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关键词
future space telescopes,dark hole
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