半导体泵浦铷蒸气激光器阈值特性

以速率方程为基础建立理论模型,采用迭代计算方法,对单程端面泵浦铷蒸气激光器的阈值特性进行了详细研究。研究表明,铷室温度和长度对阈值泵浦功率密度的影响具有等价性,存在使阈值功率密度达到最小的最佳铷室长度与温度组合。泵浦光线宽对阈值功率密度的影响基本呈线性;泵浦光线宽越宽,泵浦光中心波长与铷原子吸收波长的偏移量对阈值功率密度的影响越小;存在最佳的铷原子吸收线宽,使阈值功率密度达到最小;为减小阈值功率密度,铷室窗口片应尽量考虑镀膜,谐振腔输出耦合率不宜大于80%。

Analysis on threshold characteristics of diode pumped rubidium vapor lasers

Abstract:The threshold characteristics of lasers are of great importance to the output of lasers. In this paper, we use a theoretical model, which is based on rate equations, to investigate the threshold characteristics of an end-pumped single-pass rubidium vapor laser using iteration method. The results show that, the influences of temperature and gain medium length on the threshold pump intensity are equivalent, and there exists an optimum combination of temperature and gain medium length which can minimize threshold pump intensity. The influence of pump linewidth on threshold pump intensity is linear, and the influence of central wavelength shift on pump intensity will be smaller if the pump linewidth is broader. Also there exists an optimum Rb atomic absorption linewidth, which can minimize threshold pump intensity. In order to reduce threshold pump intensity, the cell window should be anti-reflectively coated, and the output coupling-efficiency should be less than 80%.