0.5 W CW diffraction-limited-beam operation from high-efficiency resonant-optical-waveguide diode-laser arrays

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Abstract
20-element resonant-optical-waveguide antiguided arrays have been optimised for high-performance CW operation. Diffraction-limited-beam CW operation is obtained to 0.5 W; that is, far-field beam patterns of 0.7° lobe width are achieved. External differential quantum-efficiency values of 42% are obtained, whereas electrical-to-optical power conversion efficiencies at 0.5 W CW are as high as 20%.