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Green laser emission from monolithic II-VI-based pillar microcavities near room temperature
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) SEM image of the diameter micropillar prepared by FIB. The 18.5 period bottom DBR, the -cavity and the 15 period top DBR are visible. (b) spectrum of this pillar at a temperature of . (c) factor vs pillar diameter.

Image of FIG. 2.
FIG. 2.

spectra of two micropillars with diameters of (a) and (b) for increasing excitation power density at . The numbers denote the incident energy per pulse in relation to the lasing threshold energy for the and for the structure. The inset of (a) shows the PL intensity versus pump energy, measured at the spectral position of the dominating laser line. (c) External threshold pulse energy and computed absolute number of excited carriers per QW necessary for threshold in dependence of pillar cross-sectional area (dashed line is a linear fit).

Image of FIG. 3.
FIG. 3.

Computed lasing spectrum for various initial carrier densities : , , , , and . The pillar diameter is . The cavity mode with is located at . Left inset: computed modal gain for carrier densities ranging from in equidistant steps from bottom to top. The dashed line is the transparency line indicating the balance of losses and gain, marks the band gap energy. Right inset: time-resolved spectrum for ; offsets for clarity. The finite time resolution of leads to a broadening of the individual peaks by .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Green laser emission from monolithic II-VI-based pillar microcavities near room temperature