光纤激光及其相干合成光场的准确分析  

Accurate analysis of coherent beam combining of fiber laser

作　　者：亓红群[1,2] 段开椋[2] 蒲继雄[1] 

机构地区：[1]华侨大学电子科学与技术系,泉州362021 [2]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

出　　处：《激光技术》2009年第6期600-603,共4页Laser Technology

基　　金：中国科学院"西部之光"人才培养计划资助项目(2006LH02)

摘　　要：为了准确地研究光纤激光及其相干合成光束的远场传输特性,采用将 LP_(01)模分解为许多不同拉盖尔-高斯模叠加的方法,分析了 LP_(01)模以及多个光纤激光相干合成光束的传输光场分布和光束质量,并与用高斯函数表示的光纤激光的光场进行了比较。分析中发现,基模高斯光束与 LP_(01)模的初始场分布基本相同,但传输后的光场分布会产生较大误差,在光纤激光相干合成光场的分析中两者间的差别也非常明显。结果表明,为更准确地分析光纤激光及其相干合成光束的传输特性,光纤激光的模场表达式应采用拉盖尔-高斯模的叠加式。In order to study the properties of fiber laser and coherent combining beam accurately, the propagation properties and beam quality of LP01 mode and the field of coherent combining beam were analyzed in terms of the method that the mode of LP01 was decomposed into orthonormal Laguerre-Gaussian modes. Then the beam quality and the propagation field were compared with that of Gaussian beam which is usually used to describe fiber laser. The results show the far field distribution of LP01 mode and that of Gaussian beam are much different after transmission though their initial field distribution is the same, and the difference between the field of coherent combination of LP01 mode and that of Gaussian beam is obvious. For accurate analysis of the properties of coherent beam combination, the expression of the Laguerre-Gaussian modes of a fiber laser should be used.

关 键 词：激光光学 光纤激光器 相干合成 拉盖尔-高斯模 弱波导光纤 

分 类 号：O436.1[机械工程—光学工程]