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We have developed a high-power (≫0.9 W cw) diffraction-limited semiconductor laser based on a tapered semiconductor optical amplifier using a fiber Bragg grating in an external cavity configuration. Frequency-selective feedback from the fiber grating is injected into the amplifier via direct butt coupling through a single mode fiber, resulting in a spectrally stable and narrow (≪0.3 nm) high-power laser for solid-state laser pumping, laser remote sensing, and optical communications. © 1997 American Institute of Physics.