Mid-IR AGPMs for ELT applications
arXiv:1604.08355 · doi:10.1117/12.2056280
Abstract
The mid-infrared region is well suited for exoplanet detection thanks to the reduced contrast between the planet and its host star with respect to the visible and near-infrared wavelength regimes. This contrast may be further improved with Vector Vortex Coronagraphs (VVCs), which allow us to cancel the starlight. One flavour of the VVC is the AGPM (Annular Groove Phase Mask), which adds the interesting properties of subwavelength gratings (achromaticity, robustness) to the already known properties of the VVC. In this paper, we present the optimized designs, as well as the expected performances of mid-IR AGPMs etched onto synthetic diamond substrates, which are considered for the E-ELT/METIS instrument.
8 pages, 5 figures, Proc. of SPIE Vol. 9147 (2014)
References in corpus (5)
- Optical Vectorial Vortex Coronagraphs using Liquid Crystal Polymers: theory, manufacturing and laboratory demonstration
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- L'-band AGPM vector vortex coronagraph's first light on VLT/NACO: Discovery of a late-type companion at two beamwidths from an F0V star
- Laboratory demonstration of a mid-infrared AGPM vector vortex coronagraph
- L'-band AGPM vector vortex coronagraph's first light on LBTI/LMIRCam