Tip-tilt reconstruction with a single dim natural guide star in multiconjugate adaptive optics with laser guide stars

Details Tip-tilt reconstruction with a single dim natural guide star in multiconjugate adaptive optics with laser guide stars Tip-tilt reconstruction with a single dim natural guide star in multiconjugate adaptive optics with laser guide stars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005josaa..22.2719f&link_type=abstract

Optical Society of America Journal, Volume 22, Issue 12, pp. 2719-2729 (2005).

Physics

Optics

Adaptive Optics, Astronomical Telescopes, Astronomical Techniques, Artificial Guide Stars, Laser Beam Applications, Wavefront Sensors, Ccd Image Sensors, Adaptive Optics, Atmospheric Turbulence, Turbulence, Wave-Front Sensing

Scientific paper

A solution to the problem of detecting the tip-tilt modes in multiconjugate adaptive optics (MCAO) with laser guide stars (LGS) is presented. This solution requires the presence of only a single relatively dim natural guide star (NGS) within the reconstructed field of view (FoV). The dim NGS is used for the reconstruction of the tip-tilt modes on the entire FoV, while the tomographic reconstruction of second-order and higher-order modes is made possible by having an LGS constellation with LGSs at different heights. Due to the relatively low brightness required for the tip-tilt NGS and the large corrected FoV (as compared with the case of conventional adaptive optics) the presented solution provides a means to achieve near-diffraction-limited performance of a 10-m-class telescope in the near infrared over a large portion of the sky. Sky coverage calculations assuming median seeing conditions indicate that this technique could be applied to 75% (95%) of the sky, achieving corrections with an average Strehl ratio -0.42(-0.33) in the 2.2 μm K band across the 1.5 - reconstructed FoV.

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