Electric field conjugation with the project 1640 coronagraph
Abstract
The Project 1640 instrument on the 200-inch Hale telescope at Palomar Observatory is a coronagraphic instru- ment with an integral eld spectrograph at the back end, designed to nd young, self-luminous planets around nearby stars. To reach the necessary contrast for this, the PALM-3000 adaptive optics system corrects for fast atmospheric speckles, while CAL, a phase-shifting interferometer in a Mach-Zehnder con guration, measures the quasistatic components of the complex electric eld in the pupil plane following the coronagraphic stop. Two additional sensors measure and control low-order modes. These eld measurements may then be combined with a system model and data taken separately using a white-light source internal to the AO system to correct for both phase and amplitude aberrations. Here, we discuss and demonstrate the procedure to maintain a half-plane dark hole in the image plane while the spectrograph is taking data, including initial on-sky performance.
Additional Information
© 2013 Society of Photo-optical Instrumentation Engineers (SPIE). This work was performed in part at the Jet Propulsion Laboratory, California Institute of Technology, under contract to the National Aeronautics and Space Administration.Attached Files
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Additional details
- Eprint ID
- 87946
- Resolver ID
- CaltechAUTHORS:20180717-155315869
- NASA/JPL/Caltech
- Created
-
2018-07-17Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 8864