报道了千瓦级激光二极管面阵抽运固体热容激光器的理论与实验研究, 分别采用Nd:YAG单板条和双板条串接的热容激光器, 利用热容激光器的理论计算模型计算了在一定的工作时间内激光输出特性, 并进行了实验验证。实验中采用的晶体尺寸均为59 mm×40 mm×4.5 mm, 对单板条进行抽运时平均功率大约为5.6 kW, 双板条串接时为11.2 kW, 重复频率为1 kHz, 占空比为20％。实验中观察了1 s的工作时间内脉冲能量输出的波动情况, 单板条时单脉冲能量输出最大为1.3 J, 在1 s后单脉冲能量输出下降到开始的70％左右, 而双板条串接时单脉冲能量输出最大为2.06 J, 在1 s后单脉冲能量输出下降到开始的50％左右, 对单块晶体采用通水冷却的准热容热管理模式能有效地降低其热效应。

A kilowatt laser diode stack pumped solid state heat capacity laser is studied theoretically and fabricated respectively with single slab and double Nd:YAG slabs. Using the theoretical model of heat capacity laser, the output characteristic for a certian time, the relation of the output power, temperature and time, is obtained. The Nd:YAG slab size is 59 mm×40 mm×4.5 mm. The average pump power is 5.6 kW for single slab and 11.2 kW for double slabs, repetition rate of 1 kHz and duty cycle of 20%. In the 1 s running time, the output energy of the laser shows a fluctuation. And the maximal output energy is 1.3 J for one slab laser and 2.06 J for two slabs laser respectedly. After the 1 s process the output energy declines to 70% and 50% of the original values for two lasers respectively. The thermal effects have been minished for one slab cooled by water. The experimental results match well with the calculation data.