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Experimental results are presented on the effects of extraction barrier on the performance of resonant phonon terahertz quantum-cascade lasers. The extraction barrier is varied from 48 to 39 A in an otherwise identical 3.4 THz laser structure. It is found that, when the extraction barrier width decreases from 48 to 39 A, the threshold current density at 10 K increases monotonously from 900 A/cm to...
The active region temperature of THz quantum cascade lasers during continuous-wave operation was measured using interband photoluminescence technique. The active region was found to be ~40 K above heat sink temperature at maximum THz power output.
An experimental study of the effects of injector barrier thickness on the performance of terahertz quantum-cascade lasers is reported. The injector barrier is varied from 54 to 38 Aring in an otherwise identical 3.4 THz laser structure. It is shown that the threshold current density at 10 K increases monotonically from 445 A/cm2 to 1.29 kA/cm2 with reducing barrier thickness. On the other hand, an...
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