Abstract
Ga(As)Sb/GaAs quantum dot broad area lasers (BALs) with an emission wavelength of λ= 930 nm are realised. For suppressing the typical multi-transverse-mode operation of the BALs transverse mode selection filters are monolithically integrated into the laser crystal. Two different approaches are reported, which can both be considered Fourier-optical. Following our spatial-frequency-filter concept with 4f setup from [1] BALs with a monolithically integrated film waveguide lens on one facet and spatial filter elements on the other facet supporting the fundamental mode are developed [2]. The resonator length is l = f = 2700 μm determined by the focal length f of the film lens, the ridge width of 100 μm, and the filter width of 30 μm.
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