Wave-front correction using one or more synthetic beacons.

Details Wave-front correction using one or more synthetic beacons. Wave-front correction using one or more synthetic beacons.

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994josaa..11..379s&link_type=abstract

Journal of the Optical Society of America A, Vol. 11, No. 1, p. 379 - 393

Physics

Optics

16

Adaptive Optics: Guide Stars

Scientific paper

Adaptive optics has been used in a cooperative mode to measure the phase distortion of the light from a star and to correct its image with a deformable mirror. A wave-front sensor in the adaptive-optics system that measures the phase aberrations requires that an object be fairly bright for accurate performance of the measurement. The use of synthetic beacons provides a means of correcting the images of objects that are too dim to allow one to use their light to provide correction in a cooperative mode. Synthetic beacons at a finite distance do not provide a perfect correction in imaging an object at a greater distance. The error in making a correction with one or more beacons is analyzed. Analytical expressions that can be used to determine performance in a variety of geometries, with various beacon altitudes and numbers, are derived. This analysis is applied to 60-cm and 4-m systems.

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