Quantum-dot micropillar lasers subject to coherent time-delayed optical feedback from a short external cavity
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We investigate the mode-switching dynamics of an electrically driven bimodal quantum-dot micropillar laser when subject to delayed coherent optical feedback from a short external cavity. We experimentally characterize how the external cavity length, being on the same order than the microlaser’s coherence length, influences the spectral and dynamical properties of the micropillar laser. Moreover, we determine the relaxation oscillation frequency of the micropillar by superimposing optical pulse injection to a dc current. It is found that the optical pulse can be used to disturb the feedback-coupled laser within one roundtrip time in such a way that it reaches the same output power as if no feedback was present. Our results do not only expand the understanding of microlasers when subject to optical feedback from short external cavities, but pave the way towards tailoring the properties of this key nanophotonic system for studies in the quantum regime of self-feedback and its implementation to integrated photonic circuits.
Holzinger , S , Schneider , C , Höfling , S , Porte , X & Reitzenstein , S 2019 , ' Quantum-dot micropillar lasers subject to coherent time-delayed optical feedback from a short external cavity ' , Scientific Reports , vol. 9 , 631 . https://doi.org/10.1038/s41598-018-36599-3
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DescriptionThe research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework ERC Grant Agreement No. 615613 and from the German Research Foundation via CRC 787.
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