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单增益模块的无机液体激光体系在通过流动循环散热时,也导致抽运区域的增益介质在流动方向上产生了热梯度。而双增益模块的液体激光系统既能有效地散热,同时也避免了流动方向的热梯度,具有较好的性能。采用数值计算方法模拟了同样增益长度的单、双增益模块系统的热特性和输出激光的远场光斑分布,并进行了对比分析。结果表明双增益模块液体激光系统的性能明显优于单增益模块系统:远场光斑的峰值强度提高一个数量级,能量集中度和光束质量均得到明显的提高。
The inorganic liquid laser system of the single-gain module also causes the gain medium in the pumping region to generate a thermal gradient in the flow direction when it is dissipated by the circulation cycle. The dual gain module of the liquid laser system can both effectively heat, but also to avoid the flow of the thermal gradient, with good performance. The thermal characteristics of single and dual gain modules with the same gain length and the far-field spot distribution of the output laser were simulated by numerical method and compared. The results show that the dual-gain liquid-crystal laser system performs significantly better than the single-gain module system. The peak intensity of the far-field spot increases by an order of magnitude, and the energy concentration and the beam quality are obviously improved.