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We have demonstrated high‐power linear arrays of InGaAs/InGaAsP grating‐surface‐emitting lasers operating at a wavelength of 1.5 μm and emitting over 200 mW cw and 400 mW pulsed power. Arrays 1 cm in length exhibit coherent, mutual‐injection‐coupled laser action; single‐wavelength‐mode operation with a linewidth of 100 MHz at a power output of 55 mW has been observed.