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Inhomogeneous quantum dot gain medium for improved spatial coherence in wide-aperture semiconductor lasers

To analyze the problem of modal filamentation and beam-instabilities in wide-aperture semiconductor lasers, we have developed a sophisticated opto-electro-thermal model based on Maxwell-Bloch formalism, to describe frequency-, carrier- and temperature-dependent gain and dispersion. Effects of both homogeneous and inhomogeneous gain broadening are analyzed. It is shown, via linear stability analysis and high resolution space-time adaptive FEM simulations that inhomogeneous gain broadening in quantum dot (QD) lasers enhances spatial coherence and leads to suppressed filamentation and stable far-fields in both thermal and non-thermal regimes even when the phase-amplitude coupling is comparable to that in quantum well (QW) gain medium.