BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Laboratory demonstration of high-contrast in broadband light at sm
 all angular separations using the EXCEDE starlight suppression system - Da
 n Sirbu (NASA Ames)
DTSTART:20151209T160000Z
DTEND:20151209T164500Z
UID:TALK62273@talks.cam.ac.uk
CONTACT:Dr B.-O. Demory
DESCRIPTION:Direct imaging of exoplanets and circumstellar disks requires 
 starlight suppression to create regions of high-contrast in the telescope'
 s focal plane. The technological challenge increases in particular with wo
 rking regions close to the stellar PSF and for wider spectral bands. The E
 Xoplanetary Circumstellar Environments and Disk Explorer (EXCEDE) science 
 mission concept uses a visible-wavelength Phase-Induced Amplitude Apodizat
 ion (PIAA) coronagraph to enable high-contrast imaging of circumstellar de
 bris systems and some giant planets at angular separations reaching into t
 he habitable zones of some of the nearest stars. A laboratory demonstratio
 n of its starlight suppression system was carried out in the vacuum chambe
 r at the Lockheed Martin Advanced Technology Center using 10% broadband li
 ght demonstrating high contrast simultaneously in two working regions of 1
 .2-2.0 Lambda/D and 2.0-11.0 Lambda/D for a single-sided dark hole using a
  deformable mirror (DM) upstream of the PIAA coronagraph. We discuss exper
 imental results obtained from the testbed and comparisons to model simulat
 ions demonstrating contrast sensitivity.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
END:VEVENT
END:VCALENDAR