This paper comprehensively considers the suppression effect of fiber parameter control on Stimulated Brillouin Scattering (SBS), and studies the influence of different phase modulation modes, different linewidths, different fiber Yb ion densities, and different fiber lengths on the SBS threshold of the whole system, The best system setting scheme for improving SBS threshold is also given.
This paper proposes and verified a modified cavity configuration in oscillating-amplifying integrated fiber laser for stimulated Raman scattering suppression. A short segment of YDF and a long piece of GDF is used in the oscillating section, which can simultaneously suppress the onset of Raman component and avoid the self-pulsing operation caused by the extremely low gain in cavity. Experimental result shows a 31dB Raman suppression ratio at 1080nm when output power reaches 5kW without any other Raman suppression element.
The stimulated Brillouin scattering (SBS) effect in fiber amplifiers using white noise signal (WNS) phase modulated seed is simulated. The influences of cut-off frequencies of WNS and the output fiber structure on SBS threshold are discussed. Basing on simulation results, optimized phase modulation signal and output fiber structure are achieved to suppress SBS. A fiber laser is established according to the simulation results.
We proposed a simple O-shaped cylinder all-fiber-integrated laser without inter-cladding-power-strippers (CPS) based on a quasi-bidirectional pumping scheme. The fiber grooves were inscribed on the outside of an O-shaped aluminium cylinder with both straight and curved tracks. The curved track with a diameter of 10 cm could suppress the high order modes and keep a stable beam quality with the increases of output power, while the straight parts improve the robustness for fusion points and unpackaged optical components. The simplified configuration of no CPS between the oscillator and the amplifier could also improve the total efficiency. The output power, the optical-to-optical efficiency, the beam quality, and the Raman suppression are systematically investigated. It is verified that this design introduces a practical way to simultaneously improve the transverse mode instability (TMI) and SRS thresholds in a high-power fiber laser system with a simple configuration and high efficiency.
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