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A first order wavefront estimation algorithm for P1640 calibrator

Zhai, C. and Vasisht, G. and Shao, M. and Lockhart, T. and Cady, E. and Oppenheimer, B. and Burruss, R. and Roberts, J. and Beichman, C. and Brenner, D. and Crepp, J. and Dekany, R. and Hinkley, S. and Hillenbrand, L. and Ligon, E. R. and Parry, I. and Pueyo, L. and Rice, E. and Roberts, L. C., Jr. and Sivaramakrishnan, A. and Soummer, R. and Vescelus, F. and Wallace, K. and Zimmerman, N. (2012) A first order wavefront estimation algorithm for P1640 calibrator. In: Adaptive Optics Systems III. Proceedings of SPIE. No.8447. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 84476W. ISBN 9780819491480.

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P1640 calibrator is a wavefront sensor working with the P1640 coronagraph and the Palomar 3000 actuator adaptive optics system (P3K) at the Palomar 200 inch Hale telescope. It measures the wavefront by interfering post-coronagraph light with a reference beam formed by low-pass filtering the blocked light from the coronagraph focal plane mask. The P1640 instrument has a similar architecture to the Gemini Planet Imager (GPI) and its performance is currently limited by the quasi-static speckles due to non-common path wavefront errors, which comes from the non-common path for the light to arrive at the AO wavefront sensor and the coronagraph mask. By measuring the wavefront after the coronagraph mask, the non-common path wavefront error can be estimated and corrected by feeding back the error signal to the deformable mirror (DM) of the P3K AO system. Here, we present a first order wavefront estimation algorithm and an instrument calibration scheme used in experiments done recently at Palomar observatory. We calibrate the P1640 calibrator by measuring its responses to poking DM actuators with a sparse checkerboard pattern at different amplitudes. The calibration yields a complex normalization factor for wavefront estimation and establishes the registration of the DM actuators at the pupil camera of the P1640 calibrator, necessary for wavefront correction. Improvement of imaging quality after feeding back the wavefront correction to the AO system demonstrated the efficacy of the algorithm.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Zhai, C.0000-0002-0291-4522
Vasisht, G.0000-0002-1871-6264
Cady, E.0000-0002-8789-2931
Oppenheimer, B.0000-0001-7130-7681
Beichman, C.0000-0002-5627-5471
Crepp, J.0000-0003-0800-0593
Hinkley, S.0000-0001-8074-2562
Pueyo, L.0000-0003-3818-408X
Rice, E.0000-0002-3252-5886
Roberts, L. C., Jr.0000-0003-3892-2900
Soummer, R.0000-0003-2753-2819
Zimmerman, N.0000-0001-5484-1516
Additional Information:© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was prepared at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Series Name:Proceedings of SPIE
Issue or Number:8447
Record Number:CaltechAUTHORS:20161024-150653410
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Official Citation:C. Zhai ; G. Vasisht ; M. Shao ; T. Lockhart ; E. Cady ; B. Oppenheimer ; R. Burruss ; J. Roberts ; C. Beichman ; D. Brenner ; J. Crepp ; R. Dekany ; S. Hinkley ; L. Hillenbrand ; E. R. Ligon ; I. Parry ; L. Pueyo ; E. Rice ; L. C. Roberts ; A. Sivaramakrishnan ; R. Soummer ; F. Vescelus ; K. Wallace and N. Zimmerman "A first order wavefront estimation algorithm for P1640 calibrator ", Proc. SPIE 8447, Adaptive Optics Systems III, 84476W (September 13, 2012); doi:10.1117/12.927015;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71405
Deposited By: George Porter
Deposited On:24 Oct 2016 22:48
Last Modified:09 Mar 2020 13:19

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