Koechner W
Appl Opt. 1970 Jun 1;9(6):1429-34. doi: 10.1364/AO.9.001429.
A Nd : YAG crystal 7.6 cm long and 6.35 mm in diameter was pumped by two krypton filled arc lamps in a double elliptical pumping cavity. The pump radiation absorbed and the heat dissipated by the Nd : YAG crystal were measured. This was done by a calorimetric measurement of the heat removed from the YAG crystal cooling loop and by monitoring the laser output power. In separate experiments the pump cavity transfer efficiency and the optical losses of the resonator were determined. The results of these measurements show that in the case of a high powered YAG system having an output power of 250 W at 12 kW input, which is six times threshold, 7.5% of the electrical input to the lamp is being absorbed by the crystal, and 40% of the absorbed pump power leaves the crystal as stimulated emission. The experiments revealed that 15% of the electrical input into the krypton arc lamps is emitted into the absorption bands of Nd:YAG crystal. The temperature profile and the associated stress components in the YAG crystal are calculated from the experimental data.
一块长7.6厘米、直径6.35毫米的钕钇铝石榴石（Nd:YAG）晶体在一个双椭圆泵浦腔中由两盏充氪弧光灯泵浦。测量了Nd:YAG晶体吸收的泵浦辐射和散发的热量。这是通过量热法测量从YAG晶体冷却回路带走的热量以及监测激光输出功率来完成的。在单独的实验中，确定了泵浦腔的传输效率和谐振器的光学损耗。这些测量结果表明，在一个高功率YAG系统中，输入功率为12千瓦，输出功率为250瓦，是阈值的六倍，此时灯的电输入的7.5%被晶体吸收，吸收的泵浦功率的40%以受激发射的形式离开晶体。实验表明，氪弧灯电输入的15%发射到Nd:YAG晶体的吸收带中。根据实验数据计算了YAG晶体中的温度分布和相关的应力分量。
