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Fibre amplifiers in MOPA configuration are promising candidates to address the requirements of laser sources for the next generation of gravitational wave detectors (GWDs) operating at 1.0 and 1.5 μm [1]. However, the development of ASE- and SBS-free systems with significant output power in the linearly polarized TEM00 mode is quite challenging, in particular if a compact monolithic design is required.
It is well known that the efficiency of 9xx nm pumped Er3+-doped fibre amplifiers can be enhanced by an Yb3+-codoping, in particular since the absorption cross-section and the maximum doping concentration of Yb3+ are significantly larger than those of Er3+ [1]. However, if the underlying dipole-dipole interaction, a Förster resonance, is taken into account, the common fixed rate modelling [2] of the...
Single-frequency Er3+:Yb3+-codoped fibre amplifiers in MOPA configuration are promising candidates to fulfil the challenging requirements of laser sources operating at 1.5 μm for the third generation of interferometric gravitational wave detectors (GWDs) [1]. However, their output power is limited by amplified spontaneous emission (ASE) of the Yb3+ ions between 1.0 μm and 1.1 μm and stimulated Brillouin...
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.
Wavelengths around 1480 nm can be used to pump Er-doped systems [1] in order to overcome small efficiencies and huge heat loads typically related with pumping wavelengths in the 976 nm region. Additionally, Er-doped fibers suffer from fundamental limits in doping concentration, so that pump sources with high brightness to enable core pumping are preferred over multimode (976nm or 1480nm) laser diodes...
Co-seeding method at 1.0μm was applied in order to scale up the 1.5μm output power of a 976nm pumped single-frequency Er:Yb-codoped triple clad fiber amplifier to a maximum output power of 50W.
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