A Space Coronagraph Mission for Exoplanet Imaging and ...

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The demonstrated state of exoplanet coronagraphyVisible nuller coronagraph• VNC development is active atGSFC (Lyot et al.) and at JPL(Sandhu et al.)• Segmented MEMS DMs fromboth Boston Micromachines andIRIS-AO are under consideration.• Spatial filters, consisting of abundle of 1000 single modefibers coupled with lenslet arrays,are now being perfected andtested.• Starlight suppression of 1e-8 hasbeen demonstrated in laser light(Lyot et al. 2010).18
All coronagaphs require deformable mirrorsfor precise wavefront controlHCIT experiments have been carried out withXinetics DMs. Fused silica facesheet is polishednominally to λ/100 rms. Surface figure (openloop) has been shown to be settable to 0.05 nmrms and stable to 0.01 nm rms over periods of 6hours or more in a vacuum testbed environment.Protoflight qualification is in progress at JPL.MEMS DMs manufacturedby Boston Micromachines(left) and IRIS-AO (right)can be configured witheither continuous orsegmented mirrorfacesheets. MEMS DMs areactively in use in alltestbeds other than HCIT.
Page 1 and 2: Status and Challenges:A Space Coron
Page 3 and 4: Exoplanet Discovery SpaceAsterisks:
Page 6 and 7: Exoplanet Discovery Space- Hubble A
Page 10 and 11: Exoplanet Discovery Space- Extrapol
Page 12 and 13: Exoplanet Mission Readiness Checkli
Page 14 and 15: The demonstrated state of exoplanet
Page 22 and 23: Exoplanet Discovery Space- Extrapol
Page 24 and 25: Next three years are critical forbu

A Space Coronagraph Mission for Exoplanet Imaging and ...

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