Modal decomposition of anisoplanatic error of atmospheric turbulence for a laser-guide-star

Feng Shen; Wenhan Jiang

doi:10.1117/12.481675

5 September 2002 Modal decomposition of anisoplanatic error of atmospheric turbulence for a laser-guide-star

Feng Shen, Wenhan Jiang

Proceedings Volume 4926, Adaptive Optics and Applications II; (2002) https://doi.org/10.1117/12.481675
Event: Photonics Asia, 2002, Shanghai, China

Abstract

The beacon problem of Adaptive Optics (AO) is settled by the promotion of laser-guide-star (LGS), but the anisoplanatic error due to LGS will degrade the performance of AU system as well. Analytical expressions are given to evaluate the modal anisoplanatic enor of atmospheric turbulence for LGS. Anisoplanatic error for Rayleigh LGS and Na LGS are also analyzed. Results show that the modal anisoplanatic error of 90 km Na LGS is obviously less than that of 15 km Rayleigh LGS without the angle deviation between LGS and object, but is greatly sensitive to the angle deviation than Rayleigh LGS. Good performance will be obtained with low-order abenation mode correction in LGS AOS, and when angle deviation between beacon and object is larger than isoplanatic patch, low-order modes should be corrected for effective correcting result.

Citation Download Citation

Feng Shen and Wenhan Jiang "Modal decomposition of anisoplanatic error of atmospheric turbulence for a laser-guide-star", Proc. SPIE 4926, Adaptive Optics and Applications II, (5 September 2002); https://doi.org/10.1117/12.481675

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