Transient thermal profile in optically pumped laser rods
Transient thermal profile in optically pumped laser rods
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DOI：
10.1063/1.1662725
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发表时间：
1973-07
影响因子：
3.2
通讯作者：
W. Koechner
中科院分区：
文献类型：
--
作者：
W. Koechner
推导了单次激光和重复脉冲激光作用下，光泵圆柱形激光棒内的瞬时温度分布表达式。对实心和中空圆柱激光棒进行了分析。数值计算了这些解，并以图形方式给出了适用于各种系统参数的温度历史。计算结果表明，棒材的冷却条件对瞬变热分布的影响很大。结果表明，在实际情况下(冷却因子A=2~10)，与假设棒表面与冷却液之间的热阻抗为零(A=∞)时相比，热弛豫过程要慢得多。这解释了激光棒中热效应衰减时间的理论和测量之间存在的差异。
Expressions are derived for the transient temperature distribution in optically pumped cylindrical laser rods for single‐shot and repetitively pulsed operations. The analysis is performed for both solid and hollow cylindrical laser rods. The solutions are evaluated numerically and temperature histories applicable to a wide range of system parameters are presented graphically. The computations show the dependence of the transient thermal profile on the cooling condition of the rod. The results reveal that in practical situations (cooling factor: A = 2 to 10) the thermal relaxation processes are considerably slower than in the case where a zero thermal impedance (A = ∞) between the rod surface and the cooling fluid is assumed. This explains the discrepancy which existed between the theory and measured decay times of thermal effects in laser rods.