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In view of the rapid extension of offshore wind farms, there is an urgent need to improve our knowledge on possible adverse effects of underwater sound generated by pile-driving. Mortality and injuries have been observed in fish exposed to loud impulse sounds, but knowledge on the sound levels at which (sub-)lethal effects occur is limited for juvenile and… (More)
Gain dynamics of Er:Yb fiber amplifiers were studied analytically and corresponding transfer functions were measured, showing good agreement with the theoretical treatment. In addition, numerical investigations have been carried out to get deeper insight.
We collinearly combined two ytterbium doped fiber amplifiers with an output power of 11.4 W to 21.8 W. The system will be used to evaluate coherent beam combining in laser systems for gravitational wave detectors.
We present SBS suppression in a single frequency amplifier using frequency sidebands added by an EOM and complete recovery of the single frequency signal after amplification using a custom high power high modulation index EOM.