Adaptive Optics Point Spread Function Reconstruction at W. M. Keck Observatory in Laser & Natural Guide Star Modes : Final Developments

We present the final development of our point spread function reconstruction algorithm for the Keck-II telescope adaptive optics system, in laser and natural guide star modes. The method makes use of AO loop teleme- try, nearby CN2 profiler data, and on-sky phase diversity. We describe the fundamental assumptions and the mathematical models for each components of the residual phase structure function. The reconstructed PSF is compared with on-sky single star PSF. We emphasize the importance of access to a good telemetry and the fact that non-common path aberrations also affects PSF-R. The global, statistical quality of the reconstructed PSF demonstrates the validity of the method. The algorithm is now ready for AO science data reduction (see the companion overview paper, Ragland et al.1 - this conference).

[1]  B L Ellerbroek,et al.  Real-time turbulence profiling with a pair of laser guide star Shack-Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes. , 2010, Journal of the Optical Society of America. A, Optics, image science, and vision.

[2]  Laurent Jolissaint,et al.  Adaptive optics point spread function reconstruction: lessons learned from on-sky experiment on Altair/Gemini and pathway for future systems , 2010, Astronomical Telescopes + Instrumentation.

[3]  Glenn A. Tyler,et al.  Rapid evaluation of d 0 : the effective diameter of a laser-guide-star adaptive-optics system , 1994 .

[4]  D. Winker.  Effect of a finite outer scale on the Zernike decomposition of atmospheric optical turbulence , 1991 .

[5]  H. Maître,et al.  Estimation of the adaptive optics long-exposure point-spread function using control loop data , 1997 .

[6]  L. Jolissaint.  Synthetic Modeling of Astronomical Closed Loop Adaptive Optics , 2010, 1009.1581.

[7]  Laurent Jolissaint,et al.  OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair , 2004, SPIE Astronomical Telescopes + Instrumentation.

[8]  F. Lascaux,et al.  On the comparison between MASS and generalized-SCIDAR techniques , 2013, Monthly Notices of the Royal Astronomical Society.

[9]  Laurent Jolissaint,et al.  Laser guide star adaptive optics point spread function reconstruction project at W. M. Keck Observatory: preliminary on-sky results , 2014, Astronomical Telescopes and Instrumentation.

[10]  R. Parenti,et al.  Laser-guide-star system for astronomical applications , 1994 .

[11]  Laurent M. Mugnier,et al.  Retrieving the telescope and instrument static wavefront aberration with a phase diversity procedure using on-sky adaptive optics corrected images , 2012, Other Conferences.

[12]  Laurent Jolissaint,et al.  First Successful Adaptive Optics PSF Reconstruction at W. M. Keck Observatory , 2012 .

[13]  M. Sarazin,et al.  Using MASS for AO simulations: a note on the comparison between MASS and Generalized SCIDAR techniques , 2016 .

[14]  Laurent Jolissaint,et al.  Adaptive optics point spread function reconstruction project at W. M. Keck Observatory: first results with faint natural guide stars , 2012, Other Conferences.