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Achromatic Four Quadrant Phase Mask Coronagraph using the Dispersion of Form Birefringence

Mawet, D. and Lenaerts, C. and Moreau, V. and Renotte, Y. and Rouan, D. and Surdej, J. (2003) Achromatic Four Quadrant Phase Mask Coronagraph using the Dispersion of Form Birefringence. In: Astronomy with High Contrast Imaging. EAS Publications Series. No.8. EDP Sciences , France, pp. 117-128. ISBN 2-86883-687-9.

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We describe an alternative design for the 4-quadrant phase mask coronagraph described recently by Rouan et al. 2000. Based on the same principle, i.e. producing a very efficient nulling by mutually destructive interferences of the coherent light from the main source, our mask realises the pi phase shift using some properties of ZOGs (Zeroth Order Gratings) and according to an original scheme respecting the 4-quadrant symmetry. When the period of the one-dimension grating structure is smaller than the wavelength of the incident light, the structure becomes birefringent. The effective refractive indices depend on the wavelength. Using this feature, we can design a mask whose nulling efficiency is maintained within a wide wavelength range. Numerical simulations were made according to the RCWT (Rigorous Coupled Wave Theory).

Item Type:Book Section
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Mawet, D.0000-0002-8895-4735
Surdej, J.0000-0002-7005-1976
Additional Information:© 2003 EAS, EDP Sciences 2003. Published online 28 May 2003.
Series Name:EAS Publications Series
Issue or Number:8
Record Number:CaltechAUTHORS:20150528-122813624
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Official Citation:D. Mawet, C. Lenaerts, V. Moreau, Y. Renotte, D. Rouan and J. Surdej EAS Publications Series 8 117-128 (2003) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57878
Deposited By: Ruth Sustaita
Deposited On:28 May 2015 20:02
Last Modified:10 Nov 2021 21:56

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