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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 linewidth enhancement factor of a 5.2-mum distributed-feedback quantum cascade laser above the threshold current caused by detuning from the gain peak was investigated. We clearly observed different values for the linewidth enhancement factor.
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