大模场低损耗光子晶体光纤的研究与设计  

Research and design of large-mode area low loss photonic crystal fiber

作　　者：吕欢祝 余明芯 钟文博 张克非[2] LÜHuanzhu;YU Mingxin;ZHONG Wenbo;ZHANG Kefei(School of Science, Southwest University of Science and Technology, Mianyang 621010, China;School of Computer Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China)

机构地区：[1]西南科技大学理学院,绵阳621010 [2]西南科技大学计算机科学与技术学院,绵阳621010

出　　处：《激光技术》2021年第2期196-201,共6页Laser Technology

基　　金：国家级大学生创新创业训练计划资助项目(201910619021);四川省科技厅重点研发资助项目(2018GZ0212);四川省高等教育人才培养质量和教学改革项目(19sjjg21)。

摘　　要：为了改善高功率光纤激光器的非线性效应,提出并设计了一种新型的无源、单模、低损耗、大模场的光子晶体光纤结构。利用时域有限差分法并结合完美匹配层边界条件,分析了光子晶体光纤有效模场面积的影响因素,得到光子晶体光纤性能随波长及几何结构的变化规律,从而得到实现更大模场面积的结构参量。结果表明,保证单模传输的情况下,在1.064μm波长处,优化设计的大模场光子晶体光纤有效模场面积可达3118.4μm^(2),对应的非线性系数可低至5.68×10^(-5)m^(-1)·W^(-1),限制损耗可降低到4.55×10^(-7)dB·m^(-1)。该光纤具备低损耗、低非线性和大模场面积等特性,在实现光子晶体光纤激光器高功率、高光束品质激光输出方面具有重要应用。A design of large-mode area photonic crystal fiber(LMA-PCF)was proposed to improve the non-linear effect of high-power fiber laser,which has the properties as large effective mode area,single mode,passive component,and low loss.The perfect matched layer was set as the boundary condition,and the effect of wavelength and structure on the effective mode area of PCF were analyzed by the finite difference time domain method.Further,a program of LMA-PCF was proposed.The results indicate that the transmission of single mode is obtained.At the wavelength of 1.064μm,the effective mode area is able to reach 3118.4μm^(2),and the non-linear coefficient is only 5.68×10^(-5) m^(-1)·W^(-1).Besides,the confinement loss can be reduced to 4.55×10^(-7) dB·m^(-1).Therefore,the high-power and high-beam of laser output is realized.

关 键 词：光纤光学 光子晶体光纤 时域有限差分法 大模场面积 低限制损耗 

分 类 号：TN253[电子电信—物理电子学]