Physics – Optics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997josaa..14.1949m&link_type=abstract
Journal of the Optical Society of America A, Vol. 14, No. 8, p. 1949 - 1966
Physics
Optics
15
Adaptive Optics: Guide Stars
Scientific paper
The residual wave-front error after correction by an adaptive optics system (AOS) with a laser guide star (LGS) as reference for the wave-front sensing is computed by using the wave-front expansion on the Zernike polynomials. The polynomial angular correlations are calculated for a spherical wave front coming from the LGS used to compensate for a plane wave front coming from a natural star and also for two arbitrary spherical wave fronts. The plot of decorrelation versus angular distance between the natural star and the LGS is much steeper for the sodium LGS than for the Rayleigh LGS. A D/n dependence is found for the 50% correlation angle, where D is the telescope diameter and n is the polynomial radial degree. The isoplanatic angle is computed for different D and observation wavelengths. For D = 8 m and a sodium LGS, the wavelength must be larger than 1.6 μm in order to produce a λ/5 wave-front error.
Molodij Guillaume
Rousset Gabriel
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