A cryogenic active optics for the SPICA coronagraph instrument

Details A cryogenic active optics for the SPICA coronagraph instrument A cryogenic active optics for the SPICA coronagraph instrument

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..85k&link_type=abstract

Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -

Physics

Optics

Scientific paper

We present the current status of the development of a cryogenic active optics for the SPICA coronagraph instrument (SCI). We have been developing a coronagraph instrument for SPICA, a 3-meter class infrared space observatory, which will be launched in 2018. The design and the development of two critical active components for SCI, i.e. a wavefront correction system with a MEMS deformable mirror and a tip-tilt mirror system will be described. A wavefront correction system consists of a 1024 element deformable mirror, which will enable us to achieve very high dynamic range imaging without extreme precision telescope mirrors. Our laboratory experiments at room temperatures showed that 106 dynamic range at 3.5 lambda/D was achieved with a stand-alone type binary mask thanks to wavefront correction with a deformable mirror. The wide-band experiment at visible wavelengths and a plan for the future cryogenic experiment will be present. We also show the designs of a cryogenic tip-tilt mirror system, which will allow a very precise, fast tip-tilt correction with extremely low heat-load. Several actuator systems are candidates for the tip-tilt system and the selection is ongoing based on the several criteria for example actuator strokes, heat generation, and compactness of the system.

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