1 中国科学院 上海光学精密机械研究所 强激光材料重点实验室,上海 201800
2 中国科学院 上海光学精密机械研究所 高功率激光物理国家实验室,上海 201800
3 中国科学院 研究生院,北京 100049
通过全矢量有限差分法数值模拟,设计了一种大模面积平顶模场光子晶体光纤。光纤截面上空气孔为三角形格子分布,中心七个空气孔缺失并在其中心引入一低折射率区域。分析了内纤芯大小、空气孔间距和空气孔相对大小等参数变化对内纤芯折射率、基模模面积等特性的影响。给出了工艺上简单易行的平顶模场光子晶体光纤结构,其平顶模面积可达2000 μm2。发现增加内纤芯尺寸和导光波长,降低空气孔相对尺寸,可以减少光纤中的高阶模含量。
光纤光学 平顶模式场光子晶体光纤 有限差分法
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 China Electronics Technology Group Corporation No.23 Research Institute, Shanghai 200437, China
We propose a kind of photonic crystal fiber with flat-top fundamental mode by introducing a depressed central dip into the core of the conventional index-guiding photonic crystal fiber. The design guidelines and characteristics of the large flattened mode photonic crystal fiber (LFM-PCF) are discussed in detail. By appropriate design, the effective area of the LFM-PCF can be increased by a factor of greater than 2 as compared with conventional index-guiding photonic crystal fiber with the same hole and pitch parameters. The improved effective area, single mode operation and flat-top fundamental mode output make LFM-PCF an ideal candidate to realize high power, high beam quality fiber amplifiers and lasers.
Large flattened mode photonic crystal fiber effective area Collection Of theses on high power laser and plasma physics
2007, 5(1): 227
