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Spontaneous and stimulated emission from gain-switched injection lasers is measured directly with picosecond resolution. Below threshold, the luminescence time profile shows a carrier concentration rise time of 300 ps in a transverse-junction AlGaAs laser diode. Above threshold, laser pulse widths down to 30 ps were observed and a regime of operation was found where a single longitudinal mode predominates in the output spectrum.
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Duguay et al. (1982) studied this question.
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