Focus anisoplanatism: a limit to the determination of tip-tilt with laser guide stars.

@article{Neyman1996FocusAA,
  title={Focus anisoplanatism: a limit to the determination of tip-tilt with laser guide stars.},
  author={Chris Neyman},
  journal={Optics letters},
  year={1996},
  volume={21 22},
  pages={1806-8}
}
One limitation to using laser beacons to measure tilt is focus anisoplanatism. By use of a spectral representation for the atmospheric turbulence, the wave-front error is expressible as an integral over the distribution of turbulence with height. Results are calculated for turbulence profiles typical of astronomical sites. The decrease in Strehl ratio when a single laser guide star is used to measure tip-tilt is shown to be especially significant at visible wavelengths, precisely where tip-tilt… CONTINUE READING

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