18 September 2007 Broadband wavefront correction algorithm for high-contrast imaging systems
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Abstract
Great strides have been made in recent years toward the goal of high-contrast imaging with a sensitivity adequate to detect earth-like planets around nearby stars. It appears that the hardware − optics, coronagraph masks, deformable mirrors, illumination systems, thermal control systems − are up to the task of obtaining the required 10-10 contrast. But in broadband light (e.g., 10% bandpass) the wavefront control algorithms have been a limiting factor. In this paper we describe a general correction methodology that works in broadband light with one or multiple deformable mirrors by conjugating the electric field in a predefined region in the image where terrestrial planets would be found. We describe the linearized approach and demonstrate its effectiveness through laboratory experiments. This paper presents results from the Jet Propulsion Laboratory High Contrast Imaging Testbed (HCIT) for both narrow-band light (2%) and broadband light (10%) correction.
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Amir Give'on, Amir Give'on, Brian Kern, Brian Kern, Stuart Shaklan, Stuart Shaklan, Dwight C. Moody, Dwight C. Moody, Laurent Pueyo, Laurent Pueyo, } "Broadband wavefront correction algorithm for high-contrast imaging systems", Proc. SPIE 6691, Astronomical Adaptive Optics Systems and Applications III, 66910A (18 September 2007); doi: 10.1117/12.733122; https://doi.org/10.1117/12.733122
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