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在已有理论基础之上,采用严格的计算方法对激光器实现太赫兹(THz)波的辐射进行了可能性分析。利用传递矩阵法,通过Matlab软件计算了基于AlGaN/GaN材料体系的三能级量子级联激光器导带子能级与电子波函数的分布,详细分析了由该材料特有的极化效应所产生的极化场,得出了在近共振条件下偶极跃迁元、外加电场、垒层Al组分及导带子能级能级差之间的关系,并研究了它们对激光器性能的影响。分析结果表明,实现受激辐射的条件非常严格,Al组分取0.15或0.16时较为适宜,同时外加电场需大于63kV/cm,但不能过大,这样才能满足近共振条件,实现粒子数反转达到太赫兹量子级联激射。在Al组分为0.15,外加电场为69.0kV/cm时激光器的偶极跃迁元最大,表明跃迁几率也最大,对激光器的性能有利,可以为量子级联激光器构造较好的有源区。
On the basis of the existing theory, a rigorous calculation method is used to analyze the possibility of laser radiation to achieve THz wave. The transfer matrix method was used to calculate the distribution of the conduction band energy levels and the electron wave function of a three-level quantum cascade laser based on the AlGaN / GaN material system by using Matlab software. The polarization generated by the material was analyzed in detail Field, the relationship between dipole transition elements, applied electric field, barrier layer Al composition and conduction band sub-level energy difference under near resonance was obtained and their effects on laser performance were also studied. The results show that the conditions of stimulated radiation are very strict. When the content of Al is 0.15 or 0.16, the applied electric field is more than 63kV / cm, but it can not be too large, so the near resonance condition can be satisfied and the number of particles reversed Achieve terahertz quantum cascade lasing. When the Al composition is 0.15 and the applied electric field is 69.0 kV / cm, the dipole transition element of the laser is the largest, indicating that the transition probability is also the largest, which is good for the performance of the laser and can be a good active area for the quantum cascade laser.