铷蒸气激光器中的碰撞能量转移效应

Energy Pooling process in rubidium vapor laser

为研究高泵浦强度下铷蒸气激光器中的碰撞能量转移效应,建立了考虑碰撞能量转移的铷蒸气激光器速率方程模型。通过计算得到高泵浦强度下(10 kW/cm2),碰撞能量转移不会显著影响激光发射速率。碰撞能量转移强弱与激发态粒子数密度和对应温度下的速率常数有关。随着泵浦强度和激发态粒子数密度提高,碰撞能量转移会减小激光发射速率。但是,在较低泵浦强度、较低粒子数密度条件下,碰撞能量转移对自发辐射的抑制效果更为显著,反而会促使激光发射速率增加。

In order to study the Energy Pooling process of the rubidium vapor laser,this paper established a rate equation model which took Energy Pooling effect into consideration.Through calculating it was found that when the magnitude of the pump intensity was,the influence of Energy Pooling process on laser photon emission rate was not remarkable.The influencing degree was related to the excited population density and the rate coefficient.With the increasing of pump intensity and excited population density,the Energy Pooling process reduced laser photon emission rate.However,under the conditions of lower pump intensity and lower excited population density,Energy Pooling significantly reduced the spontaneous radiation so that the laser photon emission rate was increased.