We describe an all-fiber ytterbium-doped laser followed by a double-stage ytterbium-doped double-clad fiber amplifier of 10-W output power for helium pumping. Different cavity designs are investigated with the goal of achieving high-power multimode emission at 1083 nm, wavelength tunability over the helium absorption bands, and linewidth envelope control over the range 1-3 GHz. We point out the domains with unstable output power and discuss their origin.
We experimentally demonstrate a passively mode-locked Er:Yb doped double-clad fiber laser using a graphene nanocoated optical taper. Averaging 20 μm of clad diameter with a length of 6 mm, such a saturable absorber enables a strong light–graphene interaction owing to the evanescent field of the excited cladding mode. With the highest pump power of 5 W, the 326th harmonic mode locking of soliton bunches with an average output power of 520 mW was obtained in a fiber ring cavity that has a fundamental frequency of 1.67 MHz. This is the highest average output power yet reported in graphene-based passively mode-locked fiber lasers.
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