| 查看: 797 | 回复: 0 | ||
[求助]
量子级联激光器的一些基本问题
|
|
小弟目前在做一些关于QCL的研究，看了很多书籍，有一些基本的原理实在不是很理解，求各位大神帮助 首先有一个基本的概念不是很理解，比如下图中的Longitudinal optical phonon，请问这个声子对upper state 的 lifetime究竟有什么影响呢 还有就是下面这段描述 Here should be noted, that in polar semiconductor compounds, for sufficiently high energy differences, intersubband nonradiative lifetimes are limited by the emission of optical phonons which are characterised by nearly constant dispersion [5]. At the same time, the electron phonon scattering matrix element is inversely proportional to the difference delta p between the initial and the final momentums of electronic states. Thus, it is obvious, that if the energy gap between ground state and the first excited state is larger than the optical phonon energy, the electron transition time from the second excited state into the first excited state is longer than that from the first excited state into the ground state, which provides the population inversion. 请问上述的 intersubband nonradiative lifetimes 是如何受optical phonons控制的。 万分感激T T |
回复此楼» 猜你喜欢
化工专硕348，一志愿985求调剂
已经有8人回复
-
0856求调剂285
已经有8人回复
-
290求调剂
已经有11人回复
-
281求调剂
已经有7人回复
-
0856化工专硕求调剂
已经有10人回复
-
材料类求调剂
已经有10人回复
-
高分子化学与物理调剂
已经有10人回复
-
321求调剂一志愿东北林业大学材料与化工英二数二
已经有7人回复
-
0856材料求调剂
已经有4人回复
-
化工专硕342，一志愿大连理工大学，求调剂
已经有4人回复
30