Y-junction and misaligned-stripe diode laser arrays with nonuniform reflective diffraction coupler

The Y-junction structures are analyzed using diffraction theory based on a scattering-matrix representation. In the analysis, the threshold behavior, mode distribution, and stability of the array modes are calculated as a function of various array structures. The oxide-restricted ridge waveguide laser is chosen as the basic laser structure and a simple fabrication process is developed. The output peak-power per facet for a 10-element Y-junction array without coating is over 800 mW and the total differential quantum efficiency reaches 70%. The misaligned-stripe laser exhibits high power of 500 mW per facet and high quantum efficiency of 60%. The fundamental mode operation is achieved for both lasers.<
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