High energy, single-mode, narrow-linewidth fiber laser source using stimulated Brillouin scattering beam cleanup.
We propose an original nonlinear beam cleaning fiber laser architecture to obtain high energy pulses with a good beam quality and a narrow linewidth. The output beam of a large core Er:Yb co-doped multimode fiber amplifier (M(2) approximately 6, 220 microJ) is converted into a near diffraction limited beam (M(2) = 1.6) through a stimulated Brillouin scattering injection seeded beam cleanup process. We report in this experiment a multimode to single mode conversion efficiency of 50% while preserving the master oscillator linewidth.
Steinhausser
B
B
Thales Research and Technology - France, RD 128, 91767 Palaiseau, France. bastien.steinhausser@thalesgroup.com
Brignon
A
A
Lallier
E
E
Huignard
J P
JP
Georges
P
P