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Design and laboratory demonstration of an achromatic vector vortex coronagraph
| Title: | Design and laboratory demonstration of an achromatic vector vortex coronagraph |
| Authors: | Murakami, Naoshi Browse this author →KAKEN DB | | Hamaguchi, Shoki Browse this author | | Sakamoto, Moritsugu Browse this author | | Fukumoto, Ryohei Browse this author | | Ise, Akitoshi Browse this author | | Oka, Kazuhiko Browse this author →KAKEN DB | | Baba, Naoshi Browse this author | | Tamura, Motohide Browse this author |
| Issue Date: | 25-Mar-2013 |
| Publisher: | Optical Society of America |
| Journal Title: | Optics Express |
| Volume: | 21 |
| Issue: | 6 |
| Start Page: | 7400 |
| End Page: | 7410 |
| Publisher DOI: | 10.1364/OE.21.007400 |
| PMID: | 23546123 |
| Abstract: | A vector vortex coronagraph (VVC) is one of promising means for imaging extremely faint objects around bright stars such as exoplanets. We present a design of an achromatic VVC, in which an axially-symmetric half-wave plate (AHP) is placed between crossed polarization filters (circular polarizer and analyzer). The circular polarizer and the analyzer are both composed of a polarizer and a quarter-wave plate (QWP). We demonstrate, via Jones calculus and Fourier analysis, that the achromatic stellar elimination can theoretically be realized by optimal polarization filters, even when chromatic AHP and QWPs are used. We carried out laboratory demonstrations of the designed VVC using a photonic-crystal AHP. As a result, we observed achromatic coronagraphic performance, a light suppression level of 7 x 10(-5), over a wavelength from 543 nm to 633 nm. (c) 2013 Optical Society of America |
| Rights: | © 2013 Optical Society of America, Inc. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/52784 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 村上 尚史
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