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Yb~(3+):KGd(WO_4)_2晶体具有增益带宽大、掺杂浓度高等突出特点,是近年来引起广泛关注的可用于构建锁模飞秒和辐射平衡激光系统的激光介质。这里建立了基于准三能级系统的微观动力学理论模型,并将其应用于端面泵浦Yb~(3+):KGd(WO_4)_2种子源和激光放大系统的理论分析中。首先从速率方程出发,讨论了准三能级激光系统的种子源部分的物理特性,指出种子源部分存在着最佳的晶体长度和输出耦合镜反射率。由于Yb~(3+):KGd(WO_4)_2晶体材料的热传导率很低,研究中拟采用主控振荡功率放大结构以实现30 W量级的激光输出,并在此基础上探讨了主控振荡功率放大器部分的输出物理特性。研究结果对将来构建实用化的Yb~(3+):KGd(WO_4)_2激光系统有着重要的理论指导意义。
The Yb3 +: KGd (WO4) 2 crystals have many advantages, such as large gain bandwidth and high doping concentration. They are the most widely used laser media for the fabrication of mode-locked femtosecond and radiation-balanced laser systems. A theoretical model based on the quasi-three-level system is established here and applied to theoretical analysis of the end-pumped Yb ~ (3 +): KGd (WO_4) _2 seed source and laser amplification system. First of all, based on the rate equation, the physical properties of the seed source part of the quasi-three-level laser system are discussed. The optimal crystal length and the output coupling mirror reflectivity exist in the seed source part. Due to the low thermal conductivity of the Yb3 +: KGd (WO4) 2 crystal material, it is proposed to use a master oscillator power amplification structure in order to achieve a laser output of 30 W, and on this basis, the main control Output Physical Characteristics of Oscillator Power Amplifier Section. The research results have important theoretical significance for the future construction of practical Yb ~ (3 +): KGd (WO_4) _2 laser system.