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Controlling the gain contribution of background emitters in few-quantum-dot microlasers
Citation key F.Gericke2018
Author F. Gericke, M. Segnon, M. von Helversen, C. Hopfmann, T. Heindel, C. Schneider, S. Höfling, M. Kamp, A. Musiał, X. Porte, C. Gies, and S. Reitzenstein
Pages 023036
Year 2018
Journal New Journal of Physics
Volume 20
Number 2
Abstract We provide experimental and theoretical insight into single-emitter lasing effects in a quantum dot (QD)-microlaser under controlled variation of background gain provided by off-resonant discrete gain centers. For that purpose, we apply an advanced two-color excitation concept where the background gain contribution of off-resonant QDs can be continuously tuned by precisely balancing the relative excitation power of two lasers emitting at different wavelengths. In this way, by selectively exciting a single resonant QD and off-resonant QDs, we identify distinct single-QD signatures in the lasing characteristics and distinguish between gain contributions of a single resonant emitter and a countable number of off-resonant background emitters to the optical output of the microlaser. Our work addresses the important question whether single-QD lasing is feasible in experimentally accessible systems and shows that, for the investigated microlaser, the single-QD gain needs to be supported by the background gain contribution of off-resonant QDs to reach the transition to lasing. Interestingly, while a single QD cannot drive the investigated micropillar into lasing, its relative contribution to the emission can be as high as 70% and it dominates the statistics of emitted photons in the intermediate excitation regime below threshold.
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