确定光子晶体光纤方位角的散射图案特征法  

Characteristics Method of Forward Scattering Patterns for Determining Azimuth Angle of Photonic Crystal Fibers

作　　者：黄华才 陈哲[1] 罗云瀚[1] 唐洁媛[1] 谢俊辛 余新宇[1] 何小莉[1] 甘宏波 马悦[1] 卫青松[1] 余健辉[1] 张军[1] 卢惠辉 戴能利[2] 彭景刚[2] 

机构地区：[1]暨南大学光电信息与传感技术广东普通高校重点实验室,广东广州510632 [2]华中科技大学武汉国家光电实验室(筹),湖北武汉430074

出　　处：《中国激光》2014年第12期130-136,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61177075;61008057;11004086;61475066;61405075);广东省战略性新兴产业核心技术攻关项目(2012A032300016;2012A080302004;2011A081302002;2012A080301002);广东省学科建设专项资金(2013CXZDA005);中央高校基本科研业务费专项(21614313;21613325;21613405);东南大学生物电子学国家重点实验室开放研究基金(2014H09)

摘　　要：为了满足加工和制作光子晶体光纤器件时的方位角定位需求,提出基于激光前向散射图案的方位角确定方法。用波长为650nm的激光垂直照射在光子晶体光纤的侧面,拍摄前向散射图案同时实时记录光子晶体光纤端面的显微图像。选取前向散射图案的局部区域强度之和为特征值,通过比较分析得出当求取前向散射图案半幅散射条纹强度值总和时,其特征值变化规律与光子晶体光纤内部轴向结构相对应,可用于光子晶体光纤特殊方位角的确定。在三种不同结构的光子晶体光纤的特殊方位角定位中,该方法的定位精度均小于0.5°,充分证实了该方法的有效性和普适性。提出的光子晶体光纤轴向特殊方位角确定方法简单实用、定位精确,将在光子晶体光纤器件加工中发挥重要的作用。In order to meet the requirement of determining the azimuth angles in fabricating optical devices from photonic crystal fibers （PCFs）, a method based on analyzing the forward scattering patterns is proposed. The PCF sample is illuminated transversely by a laser of 650 nm, and the forward scattering patterns and the tip microscopic images are simultaneously recorded. The summary of local intensities of the forward scattering patterns is chosen as the characteristic value. The characteristic value presents good correspondence to the azimuth angles of photonic crystal fiber by comparing the half image summarized intensities of the forward scattering patterns, Based on this correspondence,, the special azimuth angle can be determined. The accuracy within 0.5° obtained in the applications to three kinds of PCFs proves that the proposed method is effective and universal. This method is simple in operation, accurate in determination, and is expected to play an important role in the axial orientation in the fabrication of PCF based devices.

关 键 词：光纤光学 光子晶体光纤 散射图案 特征值 轴向方位角 

分 类 号：TN253[电子电信—物理电子学]