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Coronagraph focal-plane phase masks based on photonic crystal technology: recent progress and observational strategy

Murakami, Naoshi and Nishikawa, Jun and Traub, Wesley A. and Mawet, Dimitri and Moody, Dwight C. and Kern, Brian D. and Trauger, John T. and Serabyn, Eugene and Hamaguchi, Shoki and Oshiyama, Fumika and Sakamoto, Moritsugu and Ise, Akitoshi and Oka, Kazuhiko and Baba, Naoshi and Murakami, Hiroshi and Tamura, Motohide (2012) Coronagraph focal-plane phase masks based on photonic crystal technology: recent progress and observational strategy. In: Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.8442. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 824205. ISBN 9780819491435. (Submitted) https://resolver.caltech.edu/CaltechAUTHORS:20150522-085433692

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Abstract

Photonic crystal, an artificial periodic nanostructure of refractive indices, is one of the attractive technologies for coronagraph focal-plane masks aiming at direct imaging and characterization of terrestrial extrasolar planets. We manufactured the eight-octant phase mask (8OPM) and the vector vortex coronagraph (VVC) mask very precisely using the photonic crystal technology. Fully achromatic phase-mask coronagraphs can be realized by applying appropriate polarization filters to the masks. We carried out laboratory experiments of the polarization-filtered 8OPM coronagraph using the High-Contrast Imaging Testbed (HCIT), a state-of-the-art coronagraph simulator at the Jet Propulsion Laboratory (JPL). We report the experimental results of 10-8-level contrast across several wavelengths over 10% bandwidth around 800nm. In addition, we present future prospects and observational strategy for the photonic-crystal mask coronagraphs combined with differential imaging techniques to reach higher contrast. We proposed to apply the polarization-differential imaging (PDI) technique to the VVC, in which we built a two-channel coronagraph using polarizing beam splitters to avoid a loss of intensity due to the polarization filters. We also proposed to apply the angular-differential imaging (ADI) technique to the 8OPM coronagraph. The 8OPM/ADI mode mitigates an intensity loss due to a phase transition of the mask and provides a full field of view around central stars. We present results of preliminary laboratory demonstrations of the PDI and ADI observational modes with the phase-mask coronagraphs.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.925613DOIArticle
ORCID:
AuthorORCID
Mawet, Dimitri0000-0002-8895-4735
Tamura, Motohide0000-0002-6510-0681
Additional Information:© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). August 22, 2012. We acknowledge Takayuki Kawashima of the Photonic Lattice Inc. for providing us with useful information on a photonic-crystal device. This works were carried out at the Hokkaido University, and at the Jet Propulsion Laboratory (JPL), California Institute of Technology, under a contract with the National Aeronautics and Space Administration (NASA). This research was partially supported by the National Astronomical Observatory of Japan (NAOJ), the Japan Aerospace Exploration Agency (JAXA), and the Japan Society for the Promotion of Science (JSPS) through KAKENHI (21340041, 23740139). MT is supported by KAKENHI 22000005.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
National Astronomical Observatory of JapanUNSPECIFIED
Japan Aerospace Exploration Agency (JAXA)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)21340041
Japan Society for the Promotion of Science (JSPS)23740139
Japan Society for the Promotion of Science (JSPS)22000005
Subject Keywords:high-contrast imaging, extrasolar planets, photonic crystal, coronagraphy, eight-octant phase-mask coronagraph, vector vortex coronagraph, polarization
Series Name:Proceedings of SPIE
Issue or Number:8442
DOI:10.1117/12.925613
Record Number:CaltechAUTHORS:20150522-085433692
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150522-085433692
Official Citation:Naoshi Murakami ; Jun Nishikawa ; Wesley A. Traub ; Dimitri Mawet ; Dwight C. Moody, et al. " Coronagraph focal-plane phase masks based on photonic crystal technology: recent progress and observational strategy ", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 844205 (August 22, 2012); doi:10.1117/12.925613
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57766
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 May 2015 20:13
Last Modified:10 Nov 2021 21:55

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