The output power from two ten‐element laser diodes arrays has been efficiently summed in an external cavity to obtain a coherent, continuous wave beam. In this technique, laser emission from each front surface antireflection coated diode array is stimulated by injection of emission from a second such array. This method was also applied to single‐element diode lasers. The output beam characteristics such as spectral distribution, far‐field and near‐field beam patterns, and overall efficiency have been measured.