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Vector vortex coronagraph: first results in the visible

Mawet, Dimitri P. and Trauger, John T. and Serabyn, Eugene and Moody, Dwight C. and Liewer, Kurt M. and Krist, John E. and Shemo, David M. and O’Brien, Nada A. (2009) Vector vortex coronagraph: first results in the visible. In: Techniques and Instrumentation for Detection of Exoplanets IV. Proceedings of SPIE. No.7440. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 74400X. ISBN 9780819477309. https://resolver.caltech.edu/CaltechAUTHORS:20150520-151419415

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Abstract

We report the status of JPL and JDSU ongoing technological developments and contrast results of the vector vortex coronagraph (VVC) made out of liquid crystal polymers (LCP). The first topological charge 4 VVC was tested on the high contrast imaging testbed (HCIT) around 800 nm, under vacuum and with active wavefront control (32x32 Xinetics deformable mirror). We measured the inner working angle or IWA (50% off-axis transmission) at ~ 1.8λ/d. A one-sided dark hole ranging from 3λ/d to 10λ/d was created in polarized light, showing a mean contrast of ~ 2 × 10^(-7) over a 10% bandwidth. This contrast was maintained very close in (3 λ/d) in a reduced 2% bandwidth. These tests begin to demonstrate the potential of the LCP technology in the most demanding application of a space-based telescope dedicated to extrasolar planet characterization. The main limitations were identified as coming from incoherent sources such as multiple reflections, and residual chromaticity. A second generation of improved masks tackling these issues is being manufactured and will be tested on the HCIT in the coming months.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.826569DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1340995PublisherArticle
ORCID:
AuthorORCID
Mawet, Dimitri P.0000-0002-8895-4735
Additional Information:© 2009 SPIE. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA). D. M. is supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, California Institute of Technology, administered by Oak Ridge Associated Universities through a contract with NASA.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:High contrast imaging, exoplanets, phase-mask coronagraphy, optical vortex, polarization manipulation, wavefront control
Series Name:Proceedings of SPIE
Issue or Number:7440
DOI:10.1117/12.826569
Record Number:CaltechAUTHORS:20150520-151419415
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150520-151419415
Official Citation:Dimitri Mawet ; John T. Trauger ; Eugene Serabyn ; Dwight C. Moody, Jr. ; Kurt M. Liewer ; John E. Krist ; David M. Shemo ; Nada A. O'Brien; Vector vortex coronagraph: first results in the visible. Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400X (August 19, 2009); doi:10.1117/12.826569
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57724
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 May 2015 23:08
Last Modified:10 Nov 2021 21:54

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