10 August 2010 Development of a wavefront correction system for the SPICA coronagraph instrument
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We present the laboratory demonstration of a wavefront correction system for the SPICA project. We have been developing SPICA Coronagraph Instrument (SCI) for exoplanet detection and characterization. SCI employs a wavefront correction system with a 1024-element deformable mirror. The laboratory experiments demonstrated that 106 dynamic ranges at 3.5 λ/D can be achieved after speckle nulling by using a DM at the He-Ne laser wavelength. We also started a wide-band wavefront correction experiment in the visible wavelengths. The combination of wide-band speckle nulling algorithm and a binary pupil mask will lead to a very wide-band, high contrast imaging system.
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Takayuki Kotani, Takayuki Kotani, Keigo Enya, Keigo Enya, Takao Nakagawa, Takao Nakagawa, Lyu Abe, Lyu Abe, Kanae Haze, Kanae Haze, Shin Higuchi, Shin Higuchi, Yoshio Tange, Yoshio Tange, } "Development of a wavefront correction system for the SPICA coronagraph instrument", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77314F (10 August 2010); doi: 10.1117/12.857083; https://doi.org/10.1117/12.857083

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