重复脉冲泵浦管状固体激光器的介质温升
Transient temperature rise in a repeat pulse pumped solid-state laser tube
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摘要: 对重复脉冲泵浦的管状YAG激光器的3维温度分布进行了深入研究，计算模拟了管状介质在不同时刻的3维动态温升分布。计算结果表明，泵浦初始阶段，介质中各点的瞬态温升均随泵浦脉冲个数呈锯齿形增长，最大温升点的位置由介质内壁随时间逐渐向介质内部移动；经过大约490个脉冲泵浦后，介质内的瞬态温升最终随时间呈重复周期性变化，最大温升点将不再移动。当温升分布呈重复周期性变化后，激光管中心部分的温升较大，内外壁的温升较小，且外壁温升低于内壁温升。Abstract: The 3-dimensional transient temperature distribution in a tube YAG laser pumped by repeat pulses was studied by experiment and simulation. The result shows that the transient temperature in the tube increases with the number of pump pulses like a saw-toothed curve at the beginning of pumping, and the position of the maximum transient temperature shifts from the inner surface to the inside of the tube. After about 490 pulses, the transient temperature in the tube changes repeatedly with the same frequency of the pump pulse, and the position of the maximum transient temperature occurs at a fixed point. At this time, the temperature inside the tube is higher than that at the inner-or outer-surface of the tube, and the temperature at the inner surface is higher than that at the outer surface.?
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