Open AccessHigh-order laser guide star performance for the Euro50 telescope
Author(s) -
Changjie Fan,
Mette Owner-Petersen,
Torben Andersen,
A. Ardeberg
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.001377
Subject(s) - strehl ratio , laser guide star , optics , telescope , wavefront , laser , adaptive optics , physics , focus (optics) , residual , guide star , mathematics , algorithm
High-order laser guide star performance for the Euro50 telescope is analyzed. Focus anisoplanatism residual errors using multiple LGSs are obtained by numerical simulations. Results calculated for annual mean conditions at the La Palma site show that, considering only focus anisoplanatism, it will be possible to obtain a Strehl ratio of 0.72~0.82 at 2.2 microm using 13 LGSs. A Strehl ratio of 0.60~0.70 can be obtained at 1.25 microm using 21 LGSs. The dependence of wavefront measurement error on pulsed laser power is also investigated. The variance of the measurement error is lower than 0.2 rad2 when the laser power is larger than 14 W.