New method to achieve the proper polarization state for a vector vortex coronagraph
Abstract
Characterizing the atmospheres of Earth-sized planets necessitates of the advancement in broadband wavefront control for coronagraph systems in large segmented telescopes. At the the High-Contrast Spectroscopy Testbed (HCST) in the Exoplanet Technology Laboratory (ET Lab) at Caltech we are working on a new concept that utilizes single mode fibers (SMFs) at the image plane of the coronagraph to recover the light from the planet and feed it into a spectrograph. This technology has shown to be advantageous in both chromatic and wavefront control performance. Here we report on the status of our 20% bandwidth wavefront control experiments, in which we control the starlight coupling into an SMF in the image plane. We achieve levels of 10⁻⁸ with deformable mirror (DM) solutions that hold the null through the SMF for several hours.
Additional Information
© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE). The material is based upon work supported by NASA SAT under award No. 80NSSC20K0624. C. K. is supported by the Caltech WAVE program. J.L.-S. thanks Garreth Ruane for helpful discussions.Attached Files
Published - 118230P.pdf
Accepted Version - 2108.07371.pdf
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Additional details
- Eprint ID
- 111530
- Resolver ID
- CaltechAUTHORS:20211018-185302996
- 80NSSC20K0624
- NASA
- Caltech WAVE Fellowship
- Created
-
2021-11-15Created from EPrint's datestamp field
- Updated
-
2022-04-26Created from EPrint's last_modified field
- Caltech groups
- Astronomy Department
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 11823