The authors present the effects of the doping concentration on the performance of a set of terahertz quantum-cascade lasers emitting around 2.75 THz. The chosen design is based on the longitudinal-optical-phonon depopulation of the lower laser state. An identical structure is regrown varying the sheet density from 5.4 X 10~9 to 1.9 X 10~(10) cm~(-2). A linear dependency of the threshold current density on the doping is observed. The applied field where lasing takes place is independent of the doping. The field is responsible for the alignment of the cascades and therefore the transport of the electrons through the structure.
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机译:作者介绍了掺杂浓度对发射约2.75 THz的一组太赫兹量子级联激光器的性能的影响。选择的设计基于较低激光状态的纵向光子声子种群。在5.4 X 10〜9到1.9 X 10〜(10)cm〜(-2)的范围内重新生成相同的结构。观察到阈值电流密度对掺杂的线性依赖性。产生激光的应用场与掺杂无关。该场负责级联的对准,并因此负责电子通过结构的传输。
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