随着光纤制备工艺的不断改进和提高,掺镱双包层光纤激光技术得到了飞速发展,2009年IPG公司实现了单纤万瓦量级的单模激光输出。为了降低激光功率进一步提高所带来的非线性效应,国际上提出了大模场面积(LMA)有源双包层光纤的技术,通过增大纤芯面积降低纤芯中的功率密度,从而提高光纤的非线性效应阈值。然而随着双包层光纤纤芯面积的增大,必然会引起光纤激光高阶模式的产生,降低激光光束质 With the continuous improvement and improvement of optical fiber preparation technology, the technology of ytterbium-doped double-clad fiber laser has been developed rapidly. In 2009, IPG realized the single-mode watt-watt single-mode laser output. In order to reduce the non-linear effect caused by the laser power, the LMA active double-clad fiber technology has been proposed in the world to increase the power density in the fiber core by increasing the core area Nonlinear effects of optical fiber threshold. However, with the double-clad fiber core area increases, will inevitably lead to the generation of fiber laser high-order mode, reducing the laser beam quality