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Schematic of the SML-QD SDL. (a) Refractive index profile (black) and calculated optical field (gray) as a function of vertical position . Only a part of the Bragg mirror is shown. (b) Group of threefold stacked SML-QD layers. (c) Expanded sketch of a single SML-QD layer showing InAs SML depositions in GaAs.
(a) PL of a single SML structure in a QD test sample without DBR at different excitation densities. (b) Normalized surface-emitting PL, measured reflectivity, and simulated reflectivity, of the SML-QD SDL structure.
Light output characteristics with different output couplers of the SDL cavity comprising a SML QD gain medium. Inset: laser spectrum recorded at output power.
Spatial intensity profile of the output beam with Gaussian fit for two orthogonal directions. Upper and lower spectra refer to vertical and horizontal directions, respectively.
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