Effect of an excited-state optical transition on the linewidth enhancement factor of quantum dot lasers |
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Authors: | A. E. Zhukov A. V. Savelyev M. V. Maximov Yu. M. Shernyakov E. M. Arakcheeva F. I. Zubov A. A. Krasivichev N. V. Kryzhanovskaya |
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Affiliation: | 1.St. Petersburg Academic University-Nanotechnology Research and Education Center,Russian Academy of Sciences,St. Petersburg,Russia;2.Ioffe Physical Technical Institute,Russian Academy of Sciences,St.Petersburg,Russia;3.St. Petersburg State Polytechnical University,St. Petersburg,Russia |
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Abstract: | An analytical expression is derived for the linewidth enhancement factor of a quantum-dot laser, which makes it possible to describe its dependence on optical loss and photon density in an explicit form. The model accounts for refractive index variations at the ground-state optical transition due to gain/absorption variations upon the first excited-state transition in quantum dots. It is shown that a decrease in optical loss, an increase in saturated gain, and an increase in the energy separation between the excited-state and ground-state transitions results in a decrease in the α factor both at and above the lasing threshold. |
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