Time-resolved spectra of gain-switched GaAs/AlGaAs quantum-well (QW) lasers are measured by a streak camera with a monochromator to investigate effects of QW structures on picosecond lasing dynamics. The result shows that both pulse forms and spectral dynamics strongly depend on the number of the QWs: The pulse duration and spectral width are both broadened when the number of QWs is smaller. This dependence mainly results from the difference in the gain profile at the initial stage of the pulse formation due to the difference in the carrier concentration per well (cm−2). In addition, the overflow effect of carriers outside of QWs also plays a significant role when the number of QWs is smaller. Theoretical discussions considering dynamic behavior of the gain and the capturing effect of carriers into QWs explain the experimental results well.
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Sogawa et al. (1990) studied this question.
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