Physics – Optics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4839.1175t&link_type=abstract
Adaptive Optical System Technologies II. Edited by Wizinowich, Peter L.; Bonaccini, Domenico. Proceedings of the SPIE, Volume 4
Physics
Optics
1
Scientific paper
Rayleigh laser guide star technology is discussed here with particular attention paid to the effects of laser pulse length, a parameter that becomes more significant to the design when telescope apertures are greater than 10 meters. After reviewing the relative return signal for Rayleigh versus sodium laser guide stars, a brief review of the pulse length characteristics of sodium lasers is given. Only one of the proposed sodium laser systems is pulsed while the others are CW. To insure star-like sources at the wavefront sensor with FWHM < 1.0 arcsec, lasers that will be most useful for Extremely Large Telescopes must have a short pulse format whereas CW lasers will be of little to no use. A relatively simple Rayleigh laser guide star method is described for Ground Layer Adaptive Optics (GLAO). This method provides a way to average out the effects of high altitude turbulence with a single Rayleigh laser guide star leaves intact the wavefront sign needed to correct ground-layer wavefront perturbations.
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