Stable quasi 0° phase mode operation in a laser array diode nearly aligned with a phase shifter

The phase shift of the 180° out of phase mode to the 0° phase mode is an efficient means for producing a stable high power laser output in a coherent single beam. We fabricated laser array diodes which are operated in a very stable 180° out of phase mode, and a phase shifter in which accurate optical phase shift control is possible. These two devices are nearly aligned and a stable quasi 0° phase mode operation is achieved up to 200 mW without any other optical equipment. This fact indicates that it would be possible for these two devices to be integrated.