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Lasing in high-Q quantum-dot micropillar cavities
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View: Figures


Image of FIG. 1.
FIG. 1.

Photoluminescence spectra of a micropillar cavity with a diameter of . The emission of the fundamental mode with a linewidth of is shown for external excitation powers between 5 and . Inset: scanning electron micrograph of a micropillar with a diameter of .

Image of FIG. 2.
FIG. 2.

(a) Input-output characteristic of a micropillar laser at . Lasing threshold is reached at when a superlinear increase of the output intensity sets in. (b) Corresponding linewidth of the laser mode vs the external excitation power.

Image of FIG. 3.
FIG. 3.

Q factor of micropillars with different diameters between 1.0 and . The calculated upper limits for the Purcell factors show a clear maximum at a diameter of for the present sample.

Image of FIG. 4.
FIG. 4.

Power dependence of lasing intensity in log-log plot for micropillars with different diameters. Lasing is observed for pillar diameters down to containing QDs in the active layer. Solid curves correspond to calculated data based on Eq. (1).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lasing in high-Q quantum-dot micropillar cavities