为了研究长方体型Nd∶GGG热容激光晶体的热效应，通过对激光晶体工作特点的分析，采用半解析各向异性热分析方法，建立了符合实际工作状态热模型，对长方体型Nd∶GGG热容激光晶体进行了热分析，得到了激光晶体抽运阶段和冷却阶段晶体内部温度场计算公式，定量分析了晶体宽度和厚度对温度场的影响。结果表明，当使用输出功率为8100W、脉冲频率500Hz、脉冲宽度0.2ms的LD抽运晶体4s时，抽运面中心最高温升为169.1℃;停止抽运120s时，晶体最高温升下降到0.97%。所得结果为热容激光器的优化设计提供了理论依据。

介绍了荧光寿命的测试原理。设计了荧光寿命测试系统。利用脉冲取样技术测试了Nd∶GGG晶体的荧光寿命，约为250μs。采用英国的荧光光谱仪，在室温条件下，用波长为488nm的Ar离子激光器激发Nd∶GGG晶体，获得了Nd：GGG晶体的荧光光谱，计算出的Nd∶GGG晶体的受激发射截面σ(λ)为21.57×10^－20cm²。

Based on the fundamental theory of heat transfer, the mathematical formulas that describing the transient temperature distributions of two-sided laser diode (LD) pumped Nd∶GGG (gadolinium gallium garnet) heat capacity slab laser were derived in this paper. By means of finite element analysis by ANSYS, transient temperature fields and stress distribution in the slab medium were simulated with various boundary conditions, while the beam distortions induced by thermal gradients were analyzed briefly. The obtained results could benefit to the primary designing of solid state heat capacity laser (SSHCL). Numerical analysis proved that under incomplete adiabatic boundary conditions, it would result in temperature gradients perpendicular to the optical axis. About 0.2 μm optical path differences would occur between the edge and optical axis of the slab. In addition, the thermal distributions in the slab during the subsequent cooling stage were mainly studied. The influences of different cooling methods such as air cooling, water cooling and mist cooling were discussed and cooling methods suitable for a SSHCL were briefly studied.

基于对称双侧激光二极管(LD)抽运Nd∶GGG(掺钕钆镓石榴石)激光晶体板条,从热传导基本方程出发,以废热等效于内热源模型为前提, 利用有限元分析软件ANSYS对Nd∶GGG板条在热容工作下的瞬态温度场及应力场进行了数值模拟,分析了在不同边界条件下温度和应力随时间和空间的变化特性及其热致变形。计算结果表明：在激光发射阶段,边界非绝热使得板条在垂直光轴方向产生温度梯度,由此产生的折射率梯度和应力梯度导致距离光轴最远的板条边缘和光轴处产生约0.2 μm的变形量。同时模拟了冷却阶段空气对流冷却、水循环冷却及喷雾冷却条件下的温度变化过程,研究了适用于热容板条固体激光器工作的冷却手段。