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Estimate low- and high-order wavefront using P1640 calibrator measurements

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 Hillenbrand, L. and Hinkley, S. and Parry, I. and Pueyo, L. and Rice, E. and Roberts, L. C. and Sivaramakrishnan, A. and Soummer, R. and Tang, H. and Vescelus, F. and Wallace, K. and Zimmerman, N. (2013) Estimate low- and high-order wavefront using P1640 calibrator measurements. In: Techniques and Instrumentation for Detection of Exoplanets VI. Proceedings of SPIE. No.8864. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 88640L. ISBN 9780819497147.

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P1640 high contrast imaging system on the Palomar 200 inch Telescope consists of an apodized-pupil Lyot coronagraph, the PALM-3000 adaptive optics (P3K-AO), and P1640 Calibrator (CAL). Science images are recorded by an integral field spectrograph covering J-H bands for detecting and characterizing stellar companions. With aberrations from atmosphere corrected by the P3K-AO, instrument performance is limited mainly by the quasi-static speckles due to noncommon path wavefront aberrations for the light to propagate to the P3K-AO wavefront sensor and to the coronagraph mask. The non-common path wavefront aberrations are sensed by CAL, which measures the post-coronagraph E-field using interferometry, and can be effectively corrected by offsetting the P3K-AO deformable mirror target position accordingly. Previously, we have demonstrated using CAL measurements to correct high order wavefront aberrations, which is directly connected to the static speckles in the image plane. Low order wavefront, on the other hand, usually of larger amplitudes, causes light to leak through the coronagraph making the whole image plane brighter. Knowledge error in low order wavefront aberrations can also affect the estimation of the high order wavefront. Even though, CAL is designed to sense efficiently high order wavefront aberrations, the low order wavefront front can be inferred with less sensitivity. Here, we describe our method for estimating both low and high order wavefront aberrations using CAL measurements by propagating the post-coronagraph E-field to a pupil before the coronagraph. We present the results from applying this method to both simulated and experiment data.

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.0000-0003-3892-2900
Soummer, R.0000-0003-2753-2819
Zimmerman, N.0000-0001-5484-1516
Additional Information:© 2013 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
Subject Keywords:wavefront, estimation, low order, coronagraph, calibrator
Series Name:Proceedings of SPIE
Issue or Number:8864
Record Number:CaltechAUTHORS:20180713-113820608
Persistent URL:
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, L. Hillenbrand, S. Hinkley, I. Parry, L. Pueyo, E. Rice, L. C. Roberts, A. Sivaramakrishnan, R. Soummer, H. Tang, F. Vescelus, K. Wallace, N. Zimmerman, "Estimate low- and high-order wavefront using P1640 calibrator measurements", Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640L (26 September 2013); doi: 10.1117/12.2024754;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87828
Deposited By: George Porter
Deposited On:16 Jul 2018 17:34
Last Modified:16 Nov 2021 00:21

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