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Calculated CB profile and key wave functions for (a) Conventional QC laser (Ref. 4) emitting at . (b) Deep-well QC laser under an electric field of 75 kV/cm . The upper lasing level is labeled as 4, while 5, 6, and 7 are upper energy levels in the active region. The band profile at the top of each figure corresponds to the valley.
curves in pulsed (100 ns, 2 kHz) mode at various heatsink temperatures for uncoated, 3 mm long chips and of wide, ridge waveguide configuration. The threshold current density at is . Also shown is the curve at . The inset shows a typical lasing spectrum at RT near threshold.
The threshold current density and the slope efficiency as a function of heatsink temperature. and are the characteristic temperature coefficients for and the slope efficiency, respectively.
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