Abstract

970-980nm broad area (BA) diode lasers with 90-100µm stripe widths are commercially important as pump source for solid state and fiber lasers, as well as for direct applications. Although BA lasers demonstrate high continuous wave (CW) power conversion efficiency η_c > 60% and high reliable powers, P_rel > 7W, the emission spectrum is too broad (~ 4nm) and varies too quickly with temperature (~ 0.4nm/K) for many applications [1]. Introduction of a uniform overgrown distributed feedback (DFB) grating leads to narrow (FWHM < 1nm), temperature stable spectra, but this typically causes additional losses in the BA laser, leading to ηc < 60% and P_rel < 5W [2].

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