
Proceedings Paper
Mid-infrared coronagraph for SPICAFormat | Member Price | Non-Member Price |
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Paper Abstract
The SPace Infrared telescope for Cosmology and Astrophysics (SPICA) is a infrared space-borne telescope mission of
the next generation following AKARI. SPICA will carry a telescope with a 3.5 m diameter monolithic primary mirror
and the whole telescope will be cooled to 5 K. SPICA is planned to be launched in 2017, into the sun-earth L2 libration
halo orbit by an H II-A rocket and execute infrared observations at wavelengths mainly between 5 and 200 micron. The
large telescope aperture, the simple pupil shape, the capability of infrared observations from space, and the early launch
gives us with the SPICA mission a unique opportunity for coronagraphic observation. We have started development of a
coronagraphic instrument for SPICA. The primary target of the SPICA coronagraph is direct observation of extra-solar
Jovian planets. The main wavelengths of observation, the required contrast and the inner working angle (IWA) of the
SPICA coronagraph are set to be 5-27 micron (3.5-5 micron is optional), 10-6, and a few λ/D (and as small as possible),
respectively, in which λ is the observation wavelength and D is the diameter of the telescope aperture (3.5m). For our
laboratory demonstration, we focused first on a coronagraph with a binary shaped pupil mask as the primary candidate
for SPICA because of its feasibility. In an experiment with a binary shaped pupil coronagraph with a He-Ne laser
(λ=632.8nm), the achieved raw contrast was 6.7×10-8, derived from the average measured in the dark region without
active wavefront control. On the other hand, a study of Phase Induced Amplitude Apodization (PIAA) was initiated in an
attempt to achieve better performance, i.e., smaller IWA and higher throughput. A laboratory experiment was performed
using a He-Ne laser with active wavefront control, and a raw contrast of 6.5×10-7 was achieved. We also present recent
progress made in the cryogenic active optics for SPICA. Prototypes of cryogenic deformable by Micro Electro
Mechanical Systems (MEMS) techniques were developed and a first demonstration of the deformation of their surfaces
was performed with liquid nitrogen cooling. Experiments with piezo-actuators for a cryogenic tip-tilt mirror are also
ongoing.
Paper Details
Date Published: 12 July 2008
PDF: 10 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70102Z (12 July 2008); doi: 10.1117/12.788509
Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann Jr.; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)
PDF: 10 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70102Z (12 July 2008); doi: 10.1117/12.788509
Show Author Affiliations
K. Enya, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
L. Abe, Lab. Hippolyte FIZEAU, CNRS (Japan)
K. Haze, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
S. Tanaka, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
T. Nakagawa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
H. Kataza, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
S. Higuchi, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
T. Miyata, Institute of Astronomy, The Univ. of Tokyo (Japan)
S. Sako, Institute of Astronomy, The Univ. of Tokyo (Japan)
T. Nakamura, Institute of Astronomy, The Univ. of Tokyo (Japan)
L. Abe, Lab. Hippolyte FIZEAU, CNRS (Japan)
K. Haze, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
S. Tanaka, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
T. Nakagawa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
H. Kataza, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
S. Higuchi, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
T. Miyata, Institute of Astronomy, The Univ. of Tokyo (Japan)
S. Sako, Institute of Astronomy, The Univ. of Tokyo (Japan)
T. Nakamura, Institute of Astronomy, The Univ. of Tokyo (Japan)
M. Tamura, National Astronomical Observatory of Japan (Japan)
J. Nishikawa, National Astronomical Observatory of Japan (Japan)
N. Murakami, National Astronomical Observatory of Japan (Japan)
Y. Itoh, Kobe Univ. (Japan)
T. Wakayama, Nanotechnology Research Institute, Advanced Industrial Science and Technology (Japan)
T. Sato, Nanotechnology Research Institute, Advanced Industrial Science and Technology (Japan)
N. Nakagiri, Nanotechnology Research Institute, Advanced Industrial Science and Technology (Japan)
O. Guyon, Subaru Telescope, National Astronomical Observatory of Japan (Japan)
M. Venet, Observatoire Astronomique de Marseille-Provence (France)
P. Bierden, Boston Micromachines Corp. (Japan)
J. Nishikawa, National Astronomical Observatory of Japan (Japan)
N. Murakami, National Astronomical Observatory of Japan (Japan)
Y. Itoh, Kobe Univ. (Japan)
T. Wakayama, Nanotechnology Research Institute, Advanced Industrial Science and Technology (Japan)
T. Sato, Nanotechnology Research Institute, Advanced Industrial Science and Technology (Japan)
N. Nakagiri, Nanotechnology Research Institute, Advanced Industrial Science and Technology (Japan)
O. Guyon, Subaru Telescope, National Astronomical Observatory of Japan (Japan)
M. Venet, Observatoire Astronomique de Marseille-Provence (France)
P. Bierden, Boston Micromachines Corp. (Japan)
Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann Jr.; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)
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