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

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

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996optl...21.1806n&link_type=abstract

Optics Letters, Volume 21, Issue 22, November 15, 1996, pp.1806-1808

Physics

Optics

9

Astronomical Optics, Atmospheric And Ocean Optics, Atmospheric Transmittance, Focus, Optical Design And Fabrication, Profiles

Scientific paper

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 is most difficult to obtain from natural stars.

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