Vector vortex coronagraph: first results in the visible

Dimitri Mawet; John T. Trauger; Eugene Serabyn; Dwight C. Moody; Kurt M. Liewer; John E. Krist; David M. Shemo; Nada A. O'Brien

doi:10.1117/12.826569

19 August 2009 Vector vortex coronagraph: first results in the visible

Dimitri Mawet, John T. Trauger, Eugene Serabyn, Dwight C. Moody, Kurt M. Liewer, John E. Krist, David M. Shemo, Nada A. O'Brien

Author Affiliations +

Proceedings Volume 7440, Techniques and Instrumentation for Detection of Exoplanets IV; 74400X (2009) https://doi.org/10.1117/12.826569
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

Citation Download Citation

Dimitri Mawet, John T. Trauger, Eugene Serabyn, Dwight C. Moody, Kurt M. Liewer, John E. Krist, David M. Shemo, and Nada A. O'Brien "Vector vortex coronagraph: first results in the visible", Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400X (19 August 2009); https://doi.org/10.1117/12.826569

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available