Physics – Optics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...0213364b&link_type=abstract
Technical Report, DE2001-14465; UCRL-JC-135002; REPT-97-ERD-037
Physics
Optics
Laser Guidance, Telescopes, Sodium, Adaptive Optics, Laser Guide Stars, Wave Fronts, Radiance, Light Amplifiers
Scientific paper
The performance of a sodium laser guide star adaptive optics system depends crucially on the characteristics of the laser guide star in the sodium layer. System performance is quite sensitive to sodium layer spot radiance, that is, return per unit sterradian on the sky, hence we have been working to improve projected beam quality via improvements to the laser and changes to the launched beam format. The laser amplifier was reconfigured to a bounce-beam geometry, which considerably improves wavefront quality and allows a larger round instead of square launch beam aperture. The smaller beacon makes it easier to block the unwanted Rayleigh light and improves the accuracy of Hartmann sensor wavefront measurements in the A0 system. We present measurements of the beam quality and of the resulting sodium beacon and compare to similar measurements from last year.
Bauman Brian
Friedman Harvey
Gavel Donald T.
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