Hutsel Michael R, Gaylord Thomas K
School of Electrical and Computer Engineering, Georgia Institute of Technology, 777 Atlantic Drive NW, Atlanta, Georgia 30332-0250, USA.
Appl Opt. 2012 Sep 1;51(25):6179-87. doi: 10.1364/AO.51.006179.
The first concurrent measurements of the three-dimensional refractive-index and residual-stress distributions in a CO(2)-laser-irradiated fiber are presented. A Corning SMF-28 fiber was exposed from one side to focused pulses with durations of 100-500 ms. The cross-sectional form of the index modulation is asymmetric with changes concentrated on the side of the fiber facing the exposure. The longitudinal form is Gaussian-like with a wide top and extends approximately 100 μm from the center of the exposure. Relaxation of frozen-in viscoelasticity results in a maximum index modulation of 5×10(-4) on the side of the fiber facing the exposure with mechanical stress relaxation contributing changes of less than 1×10(-4).
首次给出了对CO₂激光辐照光纤中三维折射率和残余应力分布的同时测量结果。一根康宁SMF-28光纤从一侧暴露于持续时间为100 - 500毫秒的聚焦脉冲。折射率调制的横截面形式不对称，变化集中在光纤面向曝光的一侧。纵向形式呈类似高斯分布，顶部较宽，从曝光中心延伸约100μm。冻结粘弹性的松弛导致光纤面向曝光一侧的最大折射率调制为5×10⁻⁴，而机械应力松弛导致的变化小于1×10⁻⁴。
