热容型钕玻璃棒激光器工作物质的温度和热应力研究

Temperature and Thermal Stress Distribution of Nd： Glass Rod Lasers in the Heat Capacity Operation

阐述了闪光灯抽运钕玻璃棒热容型激光器重频工作方式下瞬态温度分布模型和热应力分布模型，进行了数值模拟，并和常规冷却模式下的温度、热应力分布进行了比较。结果表明：热容型激光器工作物质中心温度低于表面温度，温度梯度较小；中心应力为张应力，表面为压应力，且应力大小比冷却模式下小得多。由于工作物质承受的压应力的破坏阈值远高于张应力，所以热容型激光器比常规冷却模式激光器可以工作在更高的抽运功率上。

The transient temperature distribution model and thermal stress distribution model of flash lamp pumped heat capacity Nd：glass rod lasers in repetition rate operation is described,the models are numeri- cally simulated and compared with the conventional cooling scheme. Numerical analysis results showed that the gain medium＇ s temperature in the interior is even lower than on the surface, and the temperature gradient is small;the calculation manifests that the interior of gain medium is tensile stress and its surface is compressive, and the stress is much less than in cooling scheme. Since the destructive threshold of gain medium against compressive stress exceeds that against tensile, so heat capacity lasers can operate at far higher burst powers than cooling scheme lasers.