From Event: SPIE Optical Engineering + Applications, 2017
Hybrid Lyot Coronagraph (HLC) is one of the two operating modes of the Wide-Field InfraRed Survey Telescope (WFIRST) coronagraph instrument. Since being selected by National Aeronautics and Space Administration (NASA) in December 2013, the coronagraph technology is being matured to Technology Readiness Level (TRL) 6 by 2018. To demonstrate starlight suppression in presence of expecting on-orbit input wavefront disturbances, we have built a dynamic testbed in Jet Propulsion Laboratory (JPL) in 2016. This testbed, named as Occulting Mask Coronagraph (OMC) testbed, is designed analogous to the WFIRST flight instrument architecture: It has both HLC and Shape Pupil Coronagraph (SPC) architectures, and also has the Low Order Wavefront Sensing and Control (LOWFS/C) subsystem to sense and correct the dynamic wavefront disturbances. We present upto-date progress of HLC mode demonstration in the OMC testbed. SPC results will be reported separately. We inject the flight-like Line of Sight (LoS) and Wavefront Error (WFE) perturbation to the OMC testbed and demonstrate wavefront control using two deformable mirrors while the LOWFS/C is correcting those perturbation in our vacuum testbed. As a result, we obtain repeatable convergence below 5 × 10−9 mean contrast with 10% broadband light centered at 550 nm in the 360 degrees dark hole with working angle between 3 λ/D and 9 λ/D. We present the key hardware and software used in the testbed, the performance results and their comparison to model expectations.
Byoung-Joon Seo, Eric Cady, Brian Gordon, Brian Kern, Raymond Lam, David Marx, Dwight Moody, Richard Muller, Keith Patterson, Ilya Poberezhskiy, Camilo Mejia Prada, Erkin Sidick, Fang Shi, John Trauger, and Daniel Wilson, "Hybrid Lyot coronagraph for WFIRST: high-contrast broadband testbed demonstration," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000F (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 1 September 2017); https://doi.org/10.1117/12.2274687.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon