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SEM images of uncapped (a) and (b) quantum dots. The inset shows a larger area of the same sample. The surface is tilted by 70° to enhance the height contrast.
(Color online) Dot density of QDs as a function of Al concentration . The Al concentrations used in the laser samples are indicated by arrows. The solid line is a guide to the eye.
(Color online) (a) Threshold current density of samples a and b as a function of reciprocal cavity length and (b) dependence of reciprocal differential quantum efficiency of the two samples on the cavity length. The solid lines represent an (a) exponential and (b) linear extrapolation. The insets display (a) typical light output characteristics and spectra of long and wide lasers and (b) PL spectra of the two samples at . All measurements were performed under pulsed conditions.
(Color online) Dependence of the threshold current density on temperature of long and wide lasers fabricated from samples a and b. For the measurement the lasers were operated in pulsed mode. The values indicated were derived from linear fitting of the logarithmically plotted threshold current density data.
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