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Title: Sodium guide star adaptive optics system for astronomical imaging in the visible and near-infrared. Revision 1

Abstract

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 {mu}m on the 1m telescope, and resolution of about 0.05 arcsec with a Strehl ratio of about 0.5 at {gamma}=2.0 {mu}m on the 10m 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 trackedmore » 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.« less

Authors:
;  [1];  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Science Applications International Corp., San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10182784
Report Number(s):
UCRL-JC-109606-R1; CONF-920853-4
ON: DE92041081
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Nonlinear optics: materials, fundamentals, and applications,Maui, HI (United States),17-21 Aug 1992; Other Information: PBD: Aug 1992
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; TELESCOPES; OPTICAL SYSTEMS; STARS; LASER RADIATION; DESIGN; PERFORMANCE; 440600; OPTICAL INSTRUMENTATION

Citation Formats

Gavel, D T, Morris, J R, and Vernon, R G. Sodium guide star adaptive optics system for astronomical imaging in the visible and near-infrared. Revision 1. United States: N. p., 1992. Web.
Gavel, D T, Morris, J R, & Vernon, R G. Sodium guide star adaptive optics system for astronomical imaging in the visible and near-infrared. Revision 1. United States.
Gavel, D T, Morris, J R, and Vernon, R G. 1992. "Sodium guide star adaptive optics system for astronomical imaging in the visible and near-infrared. Revision 1". United States.
@article{osti_10182784,
title = {Sodium guide star adaptive optics system for astronomical imaging in the visible and near-infrared. Revision 1},
author = {Gavel, D T and Morris, J R and Vernon, R G},
abstractNote = {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 {mu}m on the 1m telescope, and resolution of about 0.05 arcsec with a Strehl ratio of about 0.5 at {gamma}=2.0 {mu}m on the 10m 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.},
doi = {},
url = {https://www.osti.gov/biblio/10182784}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 1992},
month = {Sat Aug 01 00:00:00 EDT 1992}
}

Conference:
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