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Multi time-step wavefront reconstruction for tomographic adaptive-optics systems

Ono, Yoshito H. and Akiyama, Masayuki and Oya, Shin and Lardiére, Olivier and Andersen, David R. and Correia, Carlos and Jackson, Kate and Bradley, Colin (2016) Multi time-step wavefront reconstruction for tomographic adaptive-optics systems. Journal of the Optical Society of America A, 33 (4). p. 726. ISSN 1084-7529.

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In tomographic adaptive-optics (AO) systems, errors due to tomographic wavefront reconstruction limit the performance and angular size of the scientific field of view (FoV), where AO correction is effective. We propose a multi time-step tomographic wavefront reconstruction method to reduce the tomographic error by using measurements from both the current and previous time steps simultaneously. We further outline the method to feed the reconstructor with both wind speed and direction of each turbulence layer. An end-to-end numerical simulation, assuming a multi-object AO (MOAO) system on a 30 m aperture telescope, shows that the multi time-step reconstruction increases the Strehl ratio (SR) over a scientific FoV of 10 arc min in diameter by a factor of 1.5–1.8 when compared to the classical tomographic reconstructor, depending on the guide star asterism and with perfect knowledge of wind speeds and directions. We also evaluate the multi time-step reconstruction method and the wind estimation method on the RAVEN demonstrator under laboratory setting conditions. The wind speeds and directions at multiple atmospheric layers are measured successfully in the laboratory experiment by our wind estimation method with errors below 2  ms^(−1). With these wind estimates, the multi time-step reconstructor increases the SR value by a factor of 1.2–1.5, which is consistent with a prediction from the end-to-end numerical simulation.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1364/JOSAA.33.000726DOIArticle
Additional Information:© 2016 Optical Society of America. Received 17 November 2015; revised 20 January 2016; accepted 28 January 2016; posted 11 February 2016 (Doc. ID 253736); published 22 March 2016. Funding: Japan Society for the Promotion of Science (JSPS) (15J02510, 23740140, 26287027); Agence Nationale de la Recherche (ANR) (ANR-11-IDEX-0001-02. Thanks to Naruhisha Takato, Yutaka Hayano, and Jean-Pierre Véran for many discussions. Thanks to the staff members of Subaru Telescope for their support. Y. Ono is supported by Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for JSPS Fellows (15J02510). M. Akiyama is supported by JSPS Grant-in-Aid for Young Scientist (B) (23740140) and Grant-in-Aid for Scientific Research (B) (26287027). C. Correia is supported by Agence Nationale de la Recherche (ANR) (ANR-11-IDEX-0001-02).
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)15J02510
Japan Society for the Promotion of Science (JSPS)23740140
Japan Society for the Promotion of Science (JSPS)26287027
Agence Nationale pour la Recherche (ANR)ANR-11-IDEX-0001-02
Issue or Number:4
Classification Code:OCIS codes: (010.1080) Active or adaptive optics; (010.1330) Atmospheric turbulence
Record Number:CaltechAUTHORS:20160429-134357022
Persistent URL:
Official Citation:Y. Ono, M. Akiyama, S. Oya, O. Lardiére, D. Andersen, C. Correia, K. Jackson, and C. Bradley, "Multi time-step wavefront reconstruction for tomographic adaptive-optics systems," J. Opt. Soc. Am. A 33, 726-740 (2016)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66553
Deposited By: Tony Diaz
Deposited On:01 May 2016 23:32
Last Modified:03 Oct 2019 09:57

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