Single-mode fiber relay for the ESO laser guide star facility

Details Single-mode fiber relay for the ESO laser guide star facility Single-mode fiber relay for the ESO laser guide star facility

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4007..258h&link_type=abstract

Proc. SPIE Vol. 4007, p. 258-269, Adaptive Optical Systems Technology, Peter L. Wizinowich; Ed.

Physics

Scientific paper

We report on efficient transportation of visible high power (> 5 W) continuous-wave laser radiation in polarization maintaining, medium-long (> 10 m) optical fibers with single-mode output. Solutions are presented to achieve both maximum launching efficiency of a free-space laser beam as well as efficient reduction of stimulated Brillouin back- scattering together with optimum excitation of mesospheric sodium atoms. The fiber throughput experiments carried out so far with shorter fibers agree well with the theoretical predictions. Single-mode transmission above 70% have been achieved in 5 m and 10 m long test fiber units at input powers of 4.2 W at 532 nm. We do not experience fiber glass damage nor changes in throughput over 200 hours operation, at power densities of 25 MW/cm2. An outlook is given on the final development steps required for successful implementation of a single-mode fiber relay system within ESO's laser guide star facility.

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