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We have developed a novel structure for achieving high-brightness output from a semiconductor laser array using coherent spatial beam combination. The structure consists of an array of curved ridge waveguides with in-phase, coherent output. Interference of the multiple outputs leads to a narrow, bright, on-axis, far-field beam shape. Experimental results demonstrate a diffraction limited output beam width, ideal for high-brightness applications. [ABSTRACT FROM PUBLISHER]

This letter presents a monolithically integrated dual-wavelength source at 850 nm suitable for use in optical heterodyning. The device consists of two surface-etched distributed Bragg reflector (DBR) lasers, a Y-branch coupler, and a curved waveguide outcoupler. The Y-branch coupler and curved outcoupler are fabricated with the same epitaxial material as the DBR lasers, enabling operation as a semiconductor optical amplifier. The spectral characteristics and frequency stability of the two wavelength lasers are reported. [ABSTRACT FROM PUBLISHER]