Phase locking of a wide aperture diode laser array was achieved with a 1/4 Talbot cavity.Output power of 7.56 W was obtained at an injection current of 35 A,responding to several lobes in the far-field pattern,and the spectrum was narrowed from 2.0 nm to 0.2 nm.Increasing output power was demonstrated by inserting a cylindrical lens,whose focal distance was 5 multiple of cavity length under the same condition,and the far-field pattern was also multi-lobes responding to output power of 8.75 W,and the spectrum of the output radiation was 0.2 nm.