千瓦级掺Yb^3＋双包层光纤激光器的热分析  

Thermal Analysis of Kilowatt Yb^(3+) Double-clad Fiber Lasers

作　　者：李剑峰[1,2,3] 段开椋[1] 曹祥杰[1] 王屹山[1] 姚欣[2] 郭永康[2] 林祥棣[2] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [2]四川大学物理科学与技术学院纳光子研究所,成都610064 [3]电子科技大学光电信息学院光电传感与信息处理重点实验室,成都610054

出　　处：《光子学报》2008年第10期1921-1927,共7页Acta Photonica Sinica

基　　金：中国科学院“西部之光”基金资助

摘　　要：针对千瓦级Yb3+光纤激光器的特殊结构,在同时考虑光纤表面的对流换热和辐射换热条件下建立了热传递模型和一维稳态传热方程.结合该稳态传热方程和光纤激光器的速率方程,数值模拟了正向泵浦1000W和双端泵浦两端各500W的条件下沿光纤纵向和径向的温度分布.计算结果表明,双端泵浦的温度分布比正向泵浦的均匀,且光纤中的最高温度比正向泵浦时下降了135.9℃.将考虑辐射换热时光纤的温度分布和忽略辐射换热时的结果进行对比,后者的温度比前者高得多,表明辐射换热是光纤激光器非常重要的换热方式.最后,分析了双端泵浦以及光纤长度不变的条件下纤芯半径、包层半径以及表面传热系数对光纤内温度分布的影响.结果表明纤芯半径不会影响光纤表面温度,而加大表面传热系数以及增大包层半径可以有效地降低光纤表面及内部温度.The beat dissipauon mechanism m Kilowatt double-clad fiber laser is investigated. Meanwhile,the steady state heat equations with consideration of both convective and radiative beat transfer are constructed . By using the steady-state rate equations and heat equations, the temperature distributions along the fiber for forward pump of 1 000 W and two-end pump of 500 W each side are calculated numerically. The results show that the temperature distribution for two-end pump mode is more even than that for forward pump mode and the maximum temperature in the fiber decreases by 135. 9;C. A comparison between the temperature distributions with and without consideration of radiative heat transfer is performed, and the results show that radiative heat transfer plays an important role in heat dissipation of high power fiber lasers. The effects of the core and cladding radius, and transfer coefficient on the temperature distributions along the fiber are investigated, and the results of which indicate that changing core radius only changes the temperature in core region and do not affect the temperature in cladding region and fiber surface, while increasing the cladding radius and transfer coefficient can decrease the temperature of the whole fiber effectively.

关 键 词：高功率光纤激光器 传热方程 速率方程 对流换热 辐射换热 温度分布 

分 类 号：TN929.11[电子电信—通信与信息系统]