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The influence of fiber glass composition on dynamics of pump-induced refractive index changes in Yb-doped silicate fibers is reported. The Yb-ions polarizability difference responsible for the effect is determined for fibers with different Yb-ion lifetimes.
Pulses from harmonically-mode-locked fiber laser were amplified in Yb-fiber to average power of 45 watts in good-quality 3-ps-pulses, at 1.3-GHz repetition rate in a near diffraction-limited-beam. 15-watts-average-power at 520 nm is produced by second-harmonic generation.
The Brillouin gain efficiency was measured in an Erbium-Ytterbium multifilament-core fiber. The corresponding Brillouin gain is 4dB smaller than for standard doped fibers. Measurement and modeling show the presence of 2 classes of acoustic modes.
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