A Caltech Library Service

Phase mask coronagraphy at JPL and Palomar

Serabyn, E. and Mawet, D. (2011) Phase mask coronagraphy at JPL and Palomar. EPJ Web of Conferences, 16 . Art. No. 03004. ISSN 2101-6275. doi:10.1051/epjconf/20111603004.

[img] PDF - Published Version
Creative Commons Attribution Non-commercial.


Use this Persistent URL to link to this item:


For the imaging of faint companions, phase mask coronagraphy has the dual advantages of a small inner working angle and high throughput. This paper summarizes our recent work in developing phase masks and in demonstrating their capabilities at JPL. Four-quadrant phase masks have been manufactured at JPL by means of both evaporation and etching, and we have been developing liquid crystal vortex phase masks in partnership with a commercial vendor. Both types of mask have been used with our extreme adaptive optics well-corrected subaperture at Palomar to detect known brown dwarf companions as close as ~ 2.5 λ/D to stars. Moreover, our recent vortex masks perform very well in laboratory tests, with a demonstrated infrared contrast of about 10^(−6) at 3 λ/D, and contrasts of a few 10^(−7) with an initial optical wavelength device. The demonstrated performance already meets the needs of ground-based extreme adaptive optics coronagraphy, and further planned improvements are aimed at reaching the 10^(−10) contrast needed for terrestrial exoplanet detection with a space-based coronagraph.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mawet, D.0000-0002-8895-4735
Additional Information:© 2011 Owned by the authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial License 3.0, which permits unrestricted use, distribution, and reproduction in any noncommercial medium, provided the original work is properly cited. Published online: 18 July 2011. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and is based on observations obtained on the Hale Telescope, Palomar Observatory, as part of a continuing collaboration between the California Institute of Technology, NASA/JPL and Cornell University.
Record Number:CaltechAUTHORS:20150602-163115129
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57954
Deposited On:05 Jun 2015 17:53
Last Modified:10 Nov 2021 21:57

Repository Staff Only: item control page