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RT PL spectra of a QDH sample with a thicker first capping layer and a longer growth interruption time (TK-L sample) and a QDH sample with a thinner first capping layer and a shorter growth interruption time (TN-S sample).
at RT vs the reciprocal cavity length for five-layer stacked QDH lasers (TK-L/TN-S samples: filled circles/squares). Solid lines are exponential fits of experimental results.
Inverse external quantum efficiency vs cavity length (TK-L/TN-S samples: filled circles/squares).
Threshold current density measured at RT as a function of the number of QDH layers for TK-L laser (filled circle) and TN-S laser (filled square) with a cavity length of 1.2 mm. The solid lines are a guide to eyes.
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