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Achromatic Four Quadrant Phase Mask 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 using the Dispersion of Form Birefringence. In: High-Contrast Imaging for Exo-Planet Detection. Proceedings of SPIE. No.4860. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, p. 182. ISBN 9780819446398.

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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 e±ciency 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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URLURL TypeDescription DOIArticle
Mawet, D.0000-0002-8895-4735
Surdej, J.0000-0002-7005-1976
Additional Information:© 2003 Society of Photo-Optical Instrumentation Engineers (SPIE). February 25, 2003.
Subject Keywords:Coronagraphy, 4-quadrant phase mask, achromaticity, subwavelength gratings, ZOGs, form birefringence
Series Name:Proceedings of SPIE
Issue or Number:4860
Record Number:CaltechAUTHORS:20150527-152842925
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Official Citation:Dimitri Mawet ; C. Lenaerts ; Vincent Moreau ; Yvon L. M. Renotte ; Daniel Rouan, et al. "Achromatic four-quadrant phase mask using the dispersion of form birefringence", Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, 182 (February 25, 2003); doi:10.1117/12.457918
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57875
Deposited By: Ruth Sustaita
Deposited On:27 May 2015 23:22
Last Modified:10 Nov 2021 21:56

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