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

Abstract

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 I-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.

Authors:
; ;  [1]
  1. and others
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10139303
Report Number(s):
UCRL-JC-116505; CONF-940395-1
ON: DE94009384
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Astronomical telescopes and instrumentation for the 21st century,Kona Beach, HI (United States),13-18 Mar 1994; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; TELESCOPES; OPTICAL SYSTEMS; DESIGN; LASER RADIATION; 440600; OPTICAL INSTRUMENTATION

Citation Formats

Max, C.E., Gavel, D.T., and Olivier, S.S. Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes. United States: N. p., 1994. Web.
Max, C.E., Gavel, D.T., & Olivier, S.S. Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes. United States.
Max, C.E., Gavel, D.T., and Olivier, S.S. Tue . "Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes". United States. https://www.osti.gov/servlets/purl/10139303.
@article{osti_10139303,
title = {Issues in the design and optimization of adaptive optics and laser guide stars for the Keck Telescopes},
author = {Max, C.E. and Gavel, D.T. and Olivier, S.S.},
abstractNote = {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 I-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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

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