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The linewidth enhancement factor (alpha) of a quantum cascade laser near room-temperature and its current dependence were investigated. The alpha, probably affected by the detuning, was still smaller than that of conventional semiconductor laser diodes.
The linewidth enhancement factor (alpha-factor) of a commercially available 6.1 mum InGaAs/InAlAs distributed-feedback quantum cascade laser capable of continuous-wave operation with a Peltier cooler and its current dependence were investigated. alpha tended to increase slowly with an increase in current. alpha, probably affected by detuning, was still smaller than that of conventional 1.55 mum semiconductor...
The magnitude of the relative intensity noise (RIN) of a 5 mum distributed-feedback quantum cascade laser (DFB-QCL) was compared with a conventional 1.55 mum DFB laser diode (LD). The RIN for the DFB-QCL at a frequency of 1 MHz was 157 dBm at 10 mW light output, about 5 dB higher than that of the DFB-LD, which could almost be fully explained by the semi-classical noise model. The resonant tunnelling...
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