摘要
We report here an ultra-broadband linearly polarized(LP)LP01-LP11 mode converter operating at 1μm based on a long period fiber grating(LPFG)fabricated in a conventional two-mode fiber(TMF)by a line-focused CO2 laser.The measured 3d B bandwidth is about 240 nm,which is the broadest bandwidth for such fiber mode converters.The maximum conversion efficiency between the LP01 and LP11 modes is>99%over the range of 1000 nm to 1085 nm,almost covering the whole emission band of Yb3+,which is useful for further power scaling of high-power fiber lasers operating at the 1μm band.
We report here an ultra-broadband linearly polarized（LP） LP01-LP11 mode converter operating at 1 μm based on a long period fiber grating（LPFG） fabricated in a conventional two-mode fiber（TMF） by a line-focused CO2 laser. The measured 3d B bandwidth is about 240 nm, which is the broadest bandwidth for such fiber mode converters. The maximum conversion efficiency between the LP01 and LP11 modes is >99% over the range of 1000 nm to 1085 nm, almost covering the whole emission band of Yb3+, which is useful for further power scaling of high-power fiber lasers operating at the 1 μm band.
作者
Xin Tian
Hao Li
Le Liu
Meng Wang
Xiaoming Xi
Zefeng Wang
田鑫;李昊;刘乐;王蒙;奚小明;王泽锋(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;State Key Laboratory of Pulsed Power Laser Technology,Changsha 410073,China;Hunan Provincial Key Laboratory of High Energy Laser Technology,Changsha 410073,China)
基金
supported by the Outstanding Youth Science Fund of Natural Science Foundation of Hunan Province(No.2019JJ20023)
the National Natural Science Foundation of China(No.11974427)
