高功率双包层光纤激光器温度场动态分析

Dynamic Temperature Field in High Power Double-clad Fiber Laser

基于动态热传导方程,对高功率双包层光纤激光器的热效应进行了数值模拟,研究了高功率双包层光纤激光器内部温度场的空间及时间特性.计算表明,对于芯径为15μm的光纤,开启泵浦光后约20s光纤温度达到稳定值,关闭泵浦光后约20s光纤冷却到室温,如采用脉冲泵浦,温度分布将随时间变化,波动频率与泵浦频率相同,泵浦频率越高波动越小,越接近相同平均功率的连续泵浦.

According to the heat conduction equation,the temperature distribution in high power double-clad fiber laser（DCFL）was analyzed.The dynamic characteristics of the temperature in the core was discussed.For the fiber with core radius of 15 μm,the computation indicates that the temperature reaches the maximum after opening the pump light for about 20 seconds.Shut down the pump light for about 20 seconds,the fiber will be cooled down to the room temperature.If pumping with pulse light,the temperature will fluctuate at the same frequency with the pulse. The higher the frequency is, the smaller the fluctuate is,the more similar with the continuous pump.