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Proceedings Paper

Testing of a transmission-filter coronagraph for ground-based imaging of exoplanets
Author(s): Jiangpei Dou; Deqing Ren; Yongtian Zhu; Xi Zhang; Xue Wang
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Paper Abstract

We present the latest laboratory test of a new coronagraph using one step-transmission filter at the visible wavelength. The primary goal of this work is to test the feasibility and stability of the coronagraph, which is designed for the ground-based telescope especially with a central obstruction and spider structures. The transmission filter is circular symmetrically coated with inconel film on one surface and manufactured with a precisely position-controlled physical mask during the coating procedure. At first, the transmission tolerance of the filter is controlled within 5% for each circular step. The target contrast of the coronagraph is set to be 10-5~10-7 at an inner working angle around 5λ/D. Based on the high-contrast imaging test-bed in the laboratory, the point spread function image of the coronagraph is obtained and it has delivered a contrast better than 10-6 at 5λ/D. As a follow-up effort, the transmission error should be controlled in 2% and the transmission for such filter will be optimized in the near infrared wavelength, which should deliver better performances. Finally, it is shown that the transmission-filter coronagraph is a promising technique to be used for the direct imaging of exoplanets from the ground.

Paper Details

Date Published: 20 July 2010
PDF: 9 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77358E (20 July 2010); doi: 10.1117/12.855775
Show Author Affiliations
Jiangpei Dou, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Nanjing Institute of Astronomical Optics & Technology (China)
Deqing Ren, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Nanjing Institute of Astronomical Optics & Technology (China)
California State Univ., Northridge (United States)
Yongtian Zhu, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Nanjing Institute of Astronomical Optics & Technology (China)
Xi Zhang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Nanjing Institute of Astronomical Optics & Technology (China)
Graduate School of the Chinese Academy of Sciences (China)
Xue Wang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Nanjing Institute of Astronomical Optics & Technology (China)
Graduate School of the Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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