The efficiency of electric pumping of THz quantum-cascade lasers (QCLs) with strip geometry is studied depending on the number and position of contact pads. The numerical simulation of the electric potential distribution in the THz QCL active region is used to determine the required thicknesses of the upper metallisation layers of the THz QCLs to minimize the voltage drop along the laser structure in the case of nonuniform current supply. It is found that the efficiency of electric pumping in the case of a centrally located contact is significantly higher than when the contact pads are located near the laser structure edges. From the calculated dependence of the THz QCL integral power on the thickness of the upper metal layer, it is shown that for effective current injection, the contact pads must be located at a distance of less than 0.5 mm from each other.

根据接触垫的数量和位置，研究了具有条形几何形状的THz量子级联激光器（QCL）的电泵效率。太赫兹QCL有源区中电势分布的数值模拟用于确定太赫兹QCL的上金属化层的所需厚度，以在电流不均匀的情况下将沿着激光器结构的电压降降至最低。已经发现，在中心位置处的接触的情况下，电泵浦的效率明显高于当接触垫位于激光结构边缘附近时的电泵的效率。从THz QCL积分功率对上层金属层厚度的计算得出的依赖关系可以看出，为了有效注入电流，接触垫必须位于小于0的距离处。