雾化Mg粉对烟火泵浦源性能的影响
Effects of pulverized Mg powders on pyrotechnic pumping source
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摘要: 为了提高烟火泵浦激光器光泵浦源的效率，改进了泵浦源的化学配方，用雾化Mg粉部分代替原来的Al-Mg合金粉。当Mg粉与合金粉的质量比为1∶1时，药柱燃速提高为完全用Al-Mg粉时的2.1倍，光辐射强度为2.4倍；药粒的燃速提高2.4倍，光辐射强度提高2.55倍，光谱效率也有所提高。分析燃速时建立了烟火药发火后的燃烧模型。模型计算结果是：当Mg粉质量分数为50％时，燃烧时间为完全用Al-Mg粉时的2.3倍；全为Mg粉时则是3.6倍。实验结果是:Mg粉质量分数为50％时，燃烧时间为完全用Al-Mg粉时的2.4倍；全为Mg粉时为3.8倍。计算结果与实验结果基本吻合。用新的泵浦源进行出光实验，激光能量由29 mJ提高到147.8 mJ。Abstract: In order to increase the pumping efficiency of pyrotechnically pumped laser, a method was presented to increase the burning rate and improve the irradiance ability of pyrotechnic agent. The new compositions were designed to replace Al-Mg alloy powders by pulverized Mg powders partially. When mass ratio between Mg and Al-Mg was 1∶1, 2.1 times burning rate and 2.4 times radiant intensity were achieved for poles, 2.4 times burning rate and 2.55 times radiant intensity were achieved for pellets, and the spectrum efficiency of poles and pellets were improved ratherish. A model was built to analyze burning rate after detonation. Calculational results according to the model were that, 2.3 times burning rate than that of Al-Mg powder as the reducing agent was achieved when mass fraction of Mg was
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Key words:
- optical pump source /
- pyrotechnic powder /
- particle size /
- burning rate /
- laser
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