Calculate the threshold current densities for the two lasers.

Two GaAs/AlGaAs double heterostructure lasers are fabricated with active region thicknesses of 2.0 µm and 0.5 µm. The optical confinement factors are 1.0 and 0.8, respectively. The carrier injection density needed to cause lasing is the first laser and 1.1 in the second one. The radiative recombination times are 1.5 ns. Calculate the threshold current densities for the two lasers.


 

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