Thermal refraction defocusing in very-large-core step-index antiguided fiber lasers

被引：1
作者：
Casperson, Lee W. [1 ,2 ]
Her, Tsing-Hua [2 ]
机构：
[1] Univ N Carolina, Dept Elect & Comp Engn, Charlotte, NC 28223 USA
[2] Univ N Carolina, Ctr Optoelect & Opt Commun, Charlotte, NC 28223 USA
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2014年 / 31卷 / 11期
基金：
美国国家科学基金会;
关键词：
WAVE-GUIDES; BEAM-PROPAGATION; MEDIA;
D O I：
10.1364/JOSAB.31.002858
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Thermal refraction defocusing in very-large-core step-index antiguided fibers is investigated theoretically. Recent analytical methods based on a zero-field approximation for studying the effects of thermal focusing are extended and applied to the defocusing effects that occur in laser media with negative temperature coefficient of refractive index. Intermediate values of thermal defocusing tend to flatten the radial intensity distribution, while strong thermal defocusing is shown to concentrate the intensity near the antiguiding core-cladding boundary. The same analysis is also applicable for very-large-core graded-index fibers with a divergent parabolic index profile. (C) 2014 Optical Society of America
引用
收藏
页码：2858 / 2863
页数：6
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