Barakat N, El-Hennawi H A, El-Diasti F
Appl Opt. 1988 Dec 15;27(24):5090-8. doi: 10.1364/AO.27.005090.
Multiple-beam Fizeau fringes revealed the existence of successive layers forming a graded-index fiber core.Both thickness and approximate refractive index graded from one layer to another have been estimated. The fiber is found to be formed from a succession of step-index layers, n(r), which remains constant over the thickness Deltar, yet follows the known function relating n(r) with r in terms of n(r = 0) and alpha. The index profile for graded-index fibers showing such microinterferograms.
多光束菲佐条纹揭示了形成渐变折射率光纤纤芯的连续层的存在。已估算出各层之间的厚度和近似折射率渐变情况。发现该光纤由一系列阶跃折射率层n(r)构成，其在厚度Δr范围内保持恒定，但根据n(r = 0)和α遵循将n(r)与r相关联的已知函数。显示出这种微干涉图的渐变折射率光纤的折射率分布。
