This chapter presents some concluding remarks. Remarkable progress in the development of self-organized quantum dot lasers is pointed out and the most notable results, e.g. a record-low threshold current density, are briefly summarized. The main parameters of QD arrays affecting the laser’s threshold characteristics are emphasized. It is recognized that device performance of existing QD lasers is still inferior when compared with the theoretical predictions for the ideal quantum dots. Inhomogeneous broadening associated with the size non-uniformity of the islands is the main problem that still remains. An expectation of bright prospects is expressed for device application of quantum dots emitting in wavelength ranges beyond the spectral limit of a quantum well.
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