论文部分内容阅读
本文使用开放型三能级无粒子数反转激光模型，从原子密度算符运动方程出发，讨论了定态情况下驱动场和探测场失谐对激光增益和折射率的影响。理论分析表明：若驱动场Ｒａｂｉ频率较小，只有探测场共振时才能得到最大的增益；调整探测场的失谐可以获得无吸收高折射率；驱动场Ｒａｂｉ频率较大而达到某一阈值后，调整探测场的失谐将出现特别增益区。驱动场失谐的变化对折射率产生的影响比对增益更为显著。以上结论与封闭型三能级无粒子数反转激光系统中的结论有很大的不同，尤其后者不存在特别增益区。
In this paper, the open three-level particle-free inversion laser model is used to study the influence of the driving field and the detection field detuning on the laser gain and the refractive index from the atomic density operator motion equation. The theoretical analysis shows that if the frequency of Rabi is small, the maximum gain can be obtained only when the resonance of the detection field is reached; the non-absorbing high refractive index can be obtained by adjusting the detuning of the detection field; when the Rabi frequency of the driving field is large and reaches a certain threshold, Adjusting the detuning of the probe field will result in a special gain region. The influence of the change of driving field mismatch on the refractive index is more significant than that of the gain. The above conclusion is very different from that of the closed three-level particle-free inversion laser system, especially the latter does not have the special gain region.