Annular Groove Phase Mask: An Achromatic Vortex Coronagraph Intended at Differential Polarimetric Imaging

Details Annular Groove Phase Mask: An Achromatic Vortex Coronagraph Intended at Differential Polarimetric Imaging Annular Groove Phase Mask: An Achromatic Vortex Coronagraph Intended at Differential Polarimetric Imaging

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..40m&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

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The Annular Groove Phase Mask (AGPM) is a broadband vectorial vortex coronagraph consisting of integrated subwavelength optical elements. After presenting the status of the manufacturing operations of near-infrared and visible prototypes, we will show why the polarization properties of the AGPM are well suited to differential polarimetric imaging. Using this special ability, we will present an instrumental concept of imaging coronagraphic spectro-polarimeter for the 1.5-meter Super Earth Explorer-Coronagraphic Off-Axis Space Telescope (SEE-COAST). Preliminary performance assessment in presence of realistic sources of noise (wavefront errors, non-common path aberrations, mask and optical component imperfections, etc) leads to 1e-9 contrasts after speckle subtraction, over a 30 %-bandwidth in the visible wavelength range and at inner working distances as small as 1 lambda/D. The AGPM is basically a vortex of topological charge 2, leading to a theta^2 sensitivity to tip-tilt. Thanks to optical integration, we will show how to practically increase the topological charge and therefore decrease the tip-tilt sensitivity, which can be useful especially for larger telescopes.

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