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Schematic cross section of oxide-confined SML InGaAs QD VCSEL.
cw room temperature (RT) and characteristics of single-mode SML InGaAs QD VCSEL with oxide tapered aperture and 17-pair top DBR. The inset shows the lasing spectra at three different pumping current values: 1 (1), 2 (2), and (3).
(a) Characteristics of SML InGaAs QD VCSEL with oxide tapered aperture diameter of : cw RT , , and characteristics. (b) Emission spectra taken at five different pumping current values: 1.6 (1), 1.9 (2), 2.2 (3), 2.6 (4), and (5). (c) Self-pulsation at two different currents and dependence of the self-pulsation frequency on pumping current.
Calculated effective index, current density, and transverse optical mode profiles as functions of radial distance for tapered aperture. The current density profile is calculated for a carrier lateral diffusion length of . The inset shows the scanning electron microscopy image of the oxide tapered aperture.
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