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sinto01新蟲 (初入文壇)
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[求助]
量子級聯(lián)激光器的一些基本問題
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小弟目前在做一些關(guān)于QCL的研究,看了很多書籍,有一些基本的原理實在不是很理解,求各位大神幫助![]() ![]() 首先有一個基本的概念不是很理解,比如下圖中的Longitudinal optical phonon,請問這個聲子對upper state 的 lifetime究竟有什么影響呢 還有就是下面這段描述 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. 請問上述的 intersubband nonradiative lifetimes 是如何受optical phonons控制的。 萬分感激T T |
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