Performance characterization of a broadband vector Apodizing Phase Plate coronagraph

Abstract

One of the main challenges for the direct imaging of planets around nearby stars is the suppression of the diffracted halo from the primary star. Coronagraphs are angular filters that suppress this diffracted halo. The Apodizing Phase Plate coronagraph modifies the pupil-plane phase with an anti-symmetric pattern to suppress diffraction over a 180 degree region from 2 to 7 λ/D and achieves a mean raw contrast of 10^-4 in this area, independent of the tip-tilt stability of the system. Current APP coronagraphs implemented using classical phase techniques are limited in bandwidth and suppression region geometry (i.e. only on 1 side of the star). In this paper, we show the vector-APP (vAPP) whose phase pattern is implemented by the orientation of patterned liquid crystals. Beam-splitting according to circular polarization states produces two, complementary PSFs with dark holes on either side. We have developed a prototype vAPP that consists of a stack of 3 twisting liquid crystal layers with a bandwidth of 500-900 nm. We characterize the properties of this device using reconstructions of the pupil-plane pattern, and of the ensuing PSF structures. By imaging the pupil between crossed and parallel polarizers we reconstruct the fast axis pattern, transmission, and retardance of the vAPP, and use this as input for a PSF model. This model includes aberrations of the laboratory set-up, and matches the measured PSF, which shows a raw contrast of 10^-3.8 between 2 and 7 λ/D in a 135 degree wedge. The vAPP coronagraph is relatively easy to manufacture and can be implemented together with a broadband quarter-wave plate and Wollaston prism in a pupil wheel in high-contrast imaging instruments. The manufacturing techniques permit the application of phase patterns with deeper contrasts inside the dark holes and enables unprecedented spectral bandwidths for phase-manipulation coronagraphy.

28 pages, 19 figures, 1 table

References in corpus (22)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Detection of Planetary Transits Across a Sun-like Star
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• Images of a fourth planet orbiting HR 8799
• The Gemini Planet Imager: First Light
• A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging
• PynPoint: An Image Processing Package for Finding Exoplanets
• Imaging Spectroscopy for Extrasolar Planet Detection
• Limits of Adaptive Optics for high contrast imaging
• Optical Vectorial Vortex Coronagraphs using Liquid Crystal Polymers: theory, manufacturing and laboratory demonstration
• Exoplanets imaging with a Phase-Induced Amplitude Apodization Coronagraph - I. Principle
• Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems
• Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy
• First Results From VLT NACO Apodizing Phase Plate: 4-micron Images of the Exoplanet beta Pictoris b
• Imaging extrasolar planets by stellar halo suppression in separately-corrected color bands
• HD100546 Multi-Epoch Scattered-Light Observations
• The Vector-APP: a Broadband Apodizing Phase Plate that yields Complementary PSFs
• First On-Sky High Contrast Imaging with an Apodizing Phase Plate
• Optimized Principal Component Analysis on Coronagraphic Images of the Fomalhaut System
• Apodized phase mask coronagraphs for arbitrary apertures
• The Extreme Polarimeter: Design, Performance, First Results & Upgrades

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