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Title: Sodium laser guide star system at Lawrence Livermore National Laboratory: System description and experimental results

Abstract

The architecture and major system components of the sodium-layer kw guide star system at LLNL will be described, and experimental results reported. The subsystems include the laser system, the beam delivery system including a pulse stretcher and beam pointing control, the beam director, and the telescope with its adaptive-optics package. The laser system is one developed for the Atomic Vapor Laser Isotope Separation (AVLIS) Program. This laser system can be configured in various ways in support of the AVLIS program objectives, and was made available to the guide star program at intermittent times on a non-interference basis. The first light transmitted into the sky was in July of 1992, at a power level of 1. 1 kW. The laser pulse width is about 32 ns, and the pulse repetition rate was 26 kHz for the 1. 1 kW configuration and 13 kHz for a 400 W configuration. The laser linewidth is tailored to match the sodium D{sub 2} absorption line, and the laser system has active control of beam pointing and wavefront quality. Because of the short pulse length the sodium transition is saturated and the laser power is not efficiently utilized. For this reason a pulse stretcher was developed,more » and the results of this effort will be reported. The beam is delivered via an evacuated pipe from the laser building to the guide star site, a distance of about 100 meters, and then launched vertically. A beam director provides the means to track the sky in the full AO system, but was not used in the experiments reported here. The return signal is collected by a 1/2 meter telescope with the AO package. This telescope is located 5 meters from the km launch tube. Smaller packages for photometry, wavefront measurement, and spot image and motion analysis have been used. Although the unavailability of the AVLIS laser precluded a full AO system demonstration, data supporting feasibility and providing input to the system design for a Lick Observatory AO system was obtained.« less

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:
10165256
Report Number(s):
UCRL-JC-114938; CONF-940391-10
ON: DE94014735
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Society of Photo-Optical Instrumentation Engineers (SPIE) conference,Kona Beach, HI (United States),13-18 Mar 1994; Other Information: PBD: 2 Mar 1994
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 47 OTHER INSTRUMENTATION; TELESCOPES; LASER GUIDANCE; SODIUM; PERFORMANCE; DESIGN; OPTICAL SYSTEMS; ASTRONOMY; 661300; 440600; OTHER ASPECTS OF PHYSICAL SCIENCE; OPTICAL INSTRUMENTATION

Citation Formats

Avicola, K, Brase, J, and Morris, J. Sodium laser guide star system at Lawrence Livermore National Laboratory: System description and experimental results. United States: N. p., 1994. Web.
Avicola, K, Brase, J, & Morris, J. Sodium laser guide star system at Lawrence Livermore National Laboratory: System description and experimental results. United States.
Avicola, K, Brase, J, and Morris, J. 1994. "Sodium laser guide star system at Lawrence Livermore National Laboratory: System description and experimental results". United States. https://www.osti.gov/servlets/purl/10165256.
@article{osti_10165256,
title = {Sodium laser guide star system at Lawrence Livermore National Laboratory: System description and experimental results},
author = {Avicola, K and Brase, J and Morris, J},
abstractNote = {The architecture and major system components of the sodium-layer kw guide star system at LLNL will be described, and experimental results reported. The subsystems include the laser system, the beam delivery system including a pulse stretcher and beam pointing control, the beam director, and the telescope with its adaptive-optics package. The laser system is one developed for the Atomic Vapor Laser Isotope Separation (AVLIS) Program. This laser system can be configured in various ways in support of the AVLIS program objectives, and was made available to the guide star program at intermittent times on a non-interference basis. The first light transmitted into the sky was in July of 1992, at a power level of 1. 1 kW. The laser pulse width is about 32 ns, and the pulse repetition rate was 26 kHz for the 1. 1 kW configuration and 13 kHz for a 400 W configuration. The laser linewidth is tailored to match the sodium D{sub 2} absorption line, and the laser system has active control of beam pointing and wavefront quality. Because of the short pulse length the sodium transition is saturated and the laser power is not efficiently utilized. For this reason a pulse stretcher was developed, and the results of this effort will be reported. The beam is delivered via an evacuated pipe from the laser building to the guide star site, a distance of about 100 meters, and then launched vertically. A beam director provides the means to track the sky in the full AO system, but was not used in the experiments reported here. The return signal is collected by a 1/2 meter telescope with the AO package. This telescope is located 5 meters from the km launch tube. Smaller packages for photometry, wavefront measurement, and spot image and motion analysis have been used. Although the unavailability of the AVLIS laser precluded a full AO system demonstration, data supporting feasibility and providing input to the system design for a Lick Observatory AO system was obtained.},
doi = {},
url = {https://www.osti.gov/biblio/10165256}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 02 00:00:00 EST 1994},
month = {Wed Mar 02 00:00:00 EST 1994}
}

Conference:
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