Atomic coherence effects in four - level system 四能級系統(tǒng)中的原子相干效應
First , we study electromagnetically induced absorption . this significant feature of the system model is that a four - level system in which three - dipole transitions are in n configuration in this system , the middle transition serves as a probe transition and two other transitions serve as couple transitions 系統(tǒng)的模型特征是:三個電偶極躍遷構成n型鏈的四能級系統(tǒng),其中,中間躍遷為探測躍遷,兩邊的躍遷為耦合躍遷。
Next we consider the effect of the coupling field linewidth to electromagnetically induced absorption , by employing a four - level system in which three transitions are in n configuration and the middle transition serves as a probe transition , we find that coupling field linewidth inhibits electromagnetically induced absorption 碩士學位論文master ’ st } iesis其次,本文研究在裸態(tài)下,考慮禍合場線寬對原子相干的作用,進一步揭示了禍合場線寬抑制電磁誘導吸收。這與禍合場線寬增強eit的吸收形成鮮明的對比。
In this paper we have done two work , one is we , in the dressed states representation , reveal that the constructive interference of atomic coherence on absorption leads to electromagnetically induced absorption , which is in sharp contrast to the case in which destructive interference of atomic coherence gives rise to electromagnetically induced transparency and the other is we reveal that coupling field linewidth inhibits electromagnetically induced absorption , by employing a four - level system in which three transitions are in n configuration and the middle transition serves as a probe transition 本文主要做了兩方面的工作:一是在修飾態(tài)表象中揭示修飾態(tài)原子相干對吸收的相長干涉產生電磁誘導吸收,這與修飾態(tài)原子相干對吸收的相消干涉導致電磁誘導透明的情形形成鮮明的對照。二是在裸態(tài)中,引入耦合場的線寬,從而發(fā)現(xiàn)耦合場的線寬抑制電磁誘導吸收。首先研究電磁誘導吸收。
In the second chapter , the operating principle of solid - state laser is analyzed . based on the model of four - level system , the interacting theory between laser field and laser crystal is studied by the rate equation theory , then the characters , such as threshold power , output power , slope efficiency etc . , of solid - state laser are deduced 第二章分析了固體激光器的工作原理,以四能級系統(tǒng)為模型,應用速率方程理論研究了激光場與激光晶體之間相互作用理論,導出了固體激光器的閾值功率、輸出功率和斜效率等特性。