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We theoretically investigate the quantum defect between pump and signal photons in ytterbium-doped fiber lasers and amplifiers, and find that this can be as low as 0.6%. We find that the lowest quantum defects can be achieved with a low area ratio between the pump and signal waveguide of a double-clad fiber, and with high-brightness pumping in the core being an ultimate approach. The change in achievable...
Fibre Raman lasers (FRLs) offer a number of attractive properties such as wavelength agility, immunity to photodarkening even at short wavelengths, absence of energy storage, and instantaneous gain [1]. Here, we report what we believe is the first continuous wave (CW) FRL pumped directly by a multimode diode laser. This is particularly attractive for power-scaling, efficiency, and short-wavelength...
Q-switching in a Yb-doped fiber laser is quenched by providing an alternative lasing wavelength to prevent inversion build-up. 98 % of the non Q-switched power is preserved while completely eliminating the Q-switched pulse.
We show theoretically that a quantum-defect below 1% is possible in tandem-pumped Yb-doped aluminosilicate fibers operating off the gain peak. Experimentally, we reach a quantum defect of 2% and a slope efficiency of 90% or more.
Through nonlinear scattering including stimulated Raman scattering and beam cleanup, a pulsed multimode pump beam is converted into a nearly diffraction-limited supercontinuum extending from 1 to 2 µm in a passive cladding-pumped nonlinear fiber converter.
This tutorial discusses the recent rapid progress of high-power fiber sources, selected state-of-the-art devices in different regimes of operation, the technology, limits to further progress, and possible routes forward.
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