为研究固体热容激光器运转的物理机制, 研制了一台演示验证样机。激光器使用钕玻璃板条为工作物质, 脉冲灯抽运, 平-凹式稳定谐振腔。固体热容激光器运转有两个工作相, 样机达到的技术性能如下: 第一工作相输出激光, 以20Hz重复频率工作10 s, 输出能量开始时23.81J/脉冲, 结束时18.51J/脉冲; 第二工作相冷却工作物质, 经编程控制的氮气冷却5min后, 激光器可重新进入第一工作相循环工作。分析了限制激光器输出激光时间的两个主要原因。试验表明：固体热容激光器输出激光时, 沉积在工作物质中的废热使工作物质处于表面温度高于内部温度的状态。由此工作物质产生了向内的压应力, 它使工作物质破坏阈值上升, 激光器可以工作在较高的温度状态。对第二工作相冷却工作物质的热管理模型进行了讨论。

In order to research the operating physical mechanism of a solid state heat capacity laser, a demonstration & validation model machine, the main structure of which is Nd:glass slab as active medium, pumping by flashlight and plano-concave stable resonator has been developed. In the heat capacity mode the laser operation is divided into two phases, the model machine offers the following technical performances: in the first operation phase, laser will be emitted, it will be working for 10s at a repetition frequency of 20Hz with an output energy of 23.81J/pulse (at the beginning) and 18.51J/pulse (at the end). And in the second operating phase, the active medium will be cooled for 5 min by program controlled nitrogen, the laser will reenter the first operating phase for cycle operating. This paper analyzed 2 key problems which limit the laser time output from the laser. After experiment, it shows that the waste heat will deposit in the active medium during emitting, making the temperature on the surface of the active medium be higher than its inner temperature so as to create an inward compress stress for the active medium, which will make the damage threshold be going up and the laser can be running at higher temperature. A heat management mode for cooling the active medium in the second operating phase was discussed also.