Physics – Optics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nomf.rept...17g&link_type=abstract
Presented at the Nonlinear Optics: Materials, Fundamentals, and Applications, Maui, HI, 17-21 Aug. 1992
Physics
Optics
Adaptive Optics, Atmospheric Turbulence, High Power Lasers, Imaging Techniques, Infrared Astronomy, Infrared Telescopes, Mesosphere, Sodium, Wave Fronts, Actuators, Diffraction, Infrared Radiation, Laser Applications, Laser Induced Fluorescence, Laser Outputs, Mirrors
Scientific paper
We are building an adaptive-optic telescope system that is based on the use of an artificial guide star created by laser-induced fluorescence of the sodium mesospheric layer. This paper discusses the system design for mid-visible to near-infrared compensation of a one meter telescope at Livermore and near-infrared compensation of the ten meter Keck telescope at Mauna Kea. We calculate the expected Strehl ratio and resolution for a 69 channel deformable mirror system and also for a possible 24 channel system upgrade. With the 69 actuator system we expect near diffraction limited resolution, about 0.2 arcsec, with a Strehl ratio of about 0.5 at gamma = 0.8 micron on the 1 m telescope and resolution of about 0.05 arcsec with a Strehl ratio of about 0.5 at gamma = 2.0 microns on the 10 m telescope. Resolution will be limited by the performance of the tip/tilt correction loop, which uses an off-axis natural guide star as a reference. At Livermore, our design uses an existing high power (1 kW) laser source, which is expected to provide an approximately 6th magnitude artificial guide star. This strong beacon signal allows a short integration time in the wavefront sensor so that temporal changes in the atmospheric turbulence can be tracked accurately. For Mauna Kea, we explore how the system to be built for the Livermore site would perform in the infrared, assuming a 100 W laser source.
Gavel Donald T.
Morris James R.
Vernon R. G.
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