We present a new theoretical scheme for a high-power -doped fiber amplifier assisted with a long period grating (LPG). This cladding-pumped amplifier is predicted to generate up to of continuous-wave output power at with a power conversion efficiency of . This device consists of an -doped cladding and an undoped core pumped with a high-power laser at a wavelength of . The LPG imprinted in the fiber core transfers a weak input signal propagating in the core mode of a single-mode fiber into a predetermined cladding mode, dramatically increasing the effective mode-area of the signal and the threshold powers for unwanted nonlinear effects such as stimulated Raman and Brillouin scattering. Depending on the choice of the cladding mode used for amplification, a second LPG imprinted at the end of the -doped fiber may be used to transfer the amplified signal into a large core output fiber with high efficiency, providing a high-quality output beam in a fundamental mode.
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