Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes

Details Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9435565m&link_type=abstract

Presented at the Astronomical Telescopes and Instrumentation for the 21st Century, Kona Beach, HI, 13-18 Mar. 1994

Physics

Optics

Adaptive Optics, Design Analysis, Laser Outputs, Mirrors, Reflecting Telescopes, Degrees Of Freedom, Laser Applications, Performance Prediction, Pulsed Lasers

Scientific paper

We discuss issues in optimizing the design of adaptive optics and laser guide star systems for the Keck Telescope. The initial tip-tilt system will use Keck's chopping secondary mirror. We describe design constraints, choice of detector, and expected performance of this tip-tilt system as well as its sky coverage. The adaptive optics system is being optimized for wavelengths of 1-2.2 mu m. We are studying adaptive optics concepts which use a wavefront sensor with varying numbers of subapertures, so as to respond to changing turbulence conditions. The goal is to be able to 'gang together' groups of deformable mirror subapertures under software control, when conditions call for larger subapertures. We present performance predictions as a function of sky coverage and the number of deformable mirror degrees of freedom. We analyze the predicted brightness several candidate laser guide star systems, as a function of laser power and pulse format. These predictions are used to examine the resulting Strehl as a function of observing wavelength and laser type. We discuss laser waste heat and thermal management issues, and conclude with an overview of instruments under design to take advantage of the Keck adaptive optics system.

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