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We report on high-power 915-nm broad-area laser diodes with a window structure formed by a impurity-free vacancy disordering method. A maximum conversion efficiency of 68% and high output power of 19.8 W have been achieved at 20°C. A stable operation over 2000 h has also been confirmed under the condition of an output power of 15 W at 25°C. Far-field patterns suggest that the laser diode is suitable for coupling into an optical fiber with 105-μm core diameter and 0.15 numerical aperture.