基于国产传能光纤的高功率包层光滤除器实验研究  

Experimental Research on High-Power Cladding Light Stripper Based on Domestic Power Delivery Fiber

作　　者：孙伟 严勇虎 郭洁[1] 姚之圃 朱永刚[1] 贺作为[1] 袁健[1] 陈伟[1] Sun Wei;Yan Yonghu;Guo Jie;Yao Zhipu;Zhu Yonggang;He Zuowei;Yuan Jian;Chen Wei(Jiangsu Alpha Optic Eletrie Techmology Co.,Ltd.,Suzhou 215200,Jiangu,China)

机构地区：[1]江苏亨通光纤科技有限公司,江苏苏州215200

出　　处：《中国激光》2022年第18期13-20,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2021YFB2900700)。

摘　　要：为了滤除高功率光纤激光器传能光纤包层中的剩余泵浦光、高阶模式激光、纤芯泄漏激光和反射光,提高高功率光纤激光器的光束质量和稳定性,基于自研国产双包层20μm/400μm传能光纤,以KHF_(2)溶液、玻璃蒙砂膏和HF为腐蚀剂,采用分段腐蚀工艺,并复合应用腐蚀剂,制备了带梯度结构的包层光滤除器。所制备的包层光滤除器在输入泵浦光功率为343 W时,输出功率只有2.22 W,功率衰减系数达21.9dB。为了在真实应用场景下利用激光器输出端传能光纤包层获得高功率低数值孔径激光,采用自研19μm/400μm双包层掺镱光纤构建光纤激光系统,在1173W激光输入时包层光滤除器可滤除208W低数值孔径包层光,在无主动散热条件下滤除器运行温度稳定在45℃以下。基于国产传能光纤制备的包层光滤除器可满足高功率光纤激光器的应用要求,保证了高功率光纤激光器的高光束质量和稳定性。Objective In order to filter out the residual pump light,the high-order mode laser,the core leakage laser,and the reflected laser in the power delivery fiber(PDF)cladding of a high power fiber laser,it is urgent to improve the beam quality and keep the operational stability of a high power fiber laser.Cladding light stripper(CLS)as the critical component for cladding light filtering,is capable of efficiently stripping cladding light and ensuring the stability and beam quality of a fiber laser.In the practical laser applications,another significant effect of CLS is to resist returning light.Due to the reflection from the workpiece surface,the light returning back to the fiber damages the resonant tank and the fiber components,disturbs the stability of the resonant tank,burns the fiber components including the fiber Bragg grating(FBG)and the combiner,and breaks down the red light chip.CLS is able to effectively eliminate the returning light transmitting in the fiber cladding,so that the damage can be suppressed enormously.At present,the main research direction of CLS is to achieve a higher power attenuation coefficient,a lower temperature rise coefficient,and a tolerance of high power through different methods.In practical application of low numerical aperture(NA)cladding light,it is difficult to withstand high power and high attenuation coefficient,and the problem of high power CLS temperature rise is still difficult to solve,which is mainly due to the long filtering distance required for low NA light and the concentrated leakage of high NA light.Most researches about CLS devices use the PDF materials at abroad.Methods Here the self-developed 20μm/400μm power delivery optical fiber is used as the preparation material of a CLS device,the KHF2 solution,glass frosted paste,and hydrofluoric acid are used as the etchants,and the segmented etching method and the composite application of the three etchants are adopted to prepare the gradient structured CLS.In order to test the CLS performance during stripping of high N

关 键 词：激光器 包层光滤除器 传能光纤 分段腐蚀 光纤激光器 

分 类 号：TN248.1[电子电信—物理电子学]