三能级laser中原子与光场相互作用化学反应模型的热力学
Thermodynamics of a chemical reaction model for the atom-field interaction in a three-level laser
摘要：
三能级激光器中能级的时间演化由一组封闭的速率方程宏观地描述。在这里，我们通过提供一个模型来补充这一图景，该模型通过化学反应描述了水平如何演变。在大多数教科书中，化学势是作为量子统计中的一个概念引入的。在本文中，我们交替地将其定义基于掺杂原子中的激发态的布居密度。然后，化学反应模型提供了一个清晰和直观的框架，以定义进一步的热力学特性的原子-场相互作用，如光子的化学势和光子熵。
英文摘要：
The temporal evolution of the levels in a three-level laser is macroscopically described by a closed set of rate equations. Here, we complement this picture by providing a model which describes through chemical reactions how the levels are evolving. In most textbooks, the chemical potential is introduced as a concept in quantum statistics. In this paper, we alternatively base its definition on population densities of the excited states in a dopant atom. Then the chemical reaction model delivers a clear and intuitive framework to define the further thermodynamic characteristics of the atom-field interactions such as the chemical potential of the photon and the photon entropy.
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