多芯双包层光纤激光器相干合束纤芯最优化排布  

Optimizing cores array for coherent beam combining with multi-core double-clad fiber laser

作　　者：张晓路[1,2] 娄淑琴[1,2] 王立文[1,2] 

机构地区：[1]北京交通大学全光网络与现代通信网教育部重点实验室,北京100044 [2]北京交通大学光波技术研究所,北京100044

出　　处：《强激光与粒子束》2011年第8期2074-2078,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60977033)

摘　　要：基于衍射理论推导出多芯双包层光纤激光器的远场相干光光强理论模型,并在此基础之上,系统地分析比较了纤芯不同排布方式的合束效果,重点研究了纤芯的单层圆环排布、多层圆环排布、方形排布、正六边形堆积排布4种方案的合束效果,及在一定纤芯排布下纤芯直径、纤芯轴间距、出射平面与衍射平面间距离、波长对合束效果的影响。研究发现:在纤芯数目一定的情况下,单层圆环排布的合束效果最优,其次是方阵排布;纤芯数目越多,截面利用率越高,可获得更大合束最大光强;方阵排布方式及正六边形堆积排布方式可有效提高截面利用率;增大纤芯直径,减小纤芯轴间距、减小出射平面与衍射平面间的距离、减小波长可以获得更好的合束效果。Based on diffraction theory, this paper deduces the equation of coherent beam intensity in far field of with multi core double-clad fiber. The effects of different fiber core arrays, especially single ring array, multilayer rings array, rectangular array and hexagon array, on the final quality of beam combination are investigated. The effects of different parameters including core diameter, core space, the distance between output plane and diffraction plane and wavelength are also studied. Numerical re suits demonstrate that, for given core number, single ring array is the best scheme among the above four core array in order to re alize high quality beam combination, and the next one is rectangular array. Increasing core number can increase cross section utili zation ratio,thus producing higher maximum laser intensity. Both rectangular array and hexagonal array can improve using efficiency of the fiber cross section. Moreover, higher laser intensity can be obtained through increasing core diameter, decreasing core space, decreasing the distance between output plane and diffraction plane and decreasing wavelength.

关 键 词：相干合成 光纤激光器 多芯双包层光纤 衍射模型 纤芯排布 

分 类 号：TN248[电子电信—物理电子学]