Refractive index change in ytterbium-doped fibers induced by photodarkening and thermal bleaching

被引：17

作者：

Ye, Changgeng ^{[1
]}

Montiel i Ponsoda, Joan J. ^{[1
]}

Tervonen, Ari ^{[1
]}

Honkanen, Seppo ^{[1
]}

机构：

[1] Aalto Univ, Dept Micro & Nanosci, Aalto 00076, Finland

来源：

APPLIED OPTICS | 2010年 / 49卷 / 30期

关键词：

POINT-BY-POINT; OPTICAL-FIBERS; SILICA FIBERS; LASER; POWER; CORE;

D O I：

10.1364/AO.49.005799

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

High-accuracy measurements and analysis of refractive index change induced by photodarkening and thermal bleaching in ytterbium-doped fibers are presented, based on a modal interference method. Photodarkening-induced refractive index change is positive at the ytterbium lasing wavelengths near 1080 nm, and it approaches a saturated level, which is in the order of 10(-6) similar to 10(-5) for the tested fiber samples. It is found that the value of this refractive index change is linearly proportional to the photo-darkening-induced excess loss at an arbitrary probe wavelength in the visible band. Thermal bleaching can only partially erase the photodarkening-induced refractive index change, leaving a residual index change of (0.2 similar to 0.3) x 10(-5). The influence of the photodarkening-induced refractive index change on fiber lasers is discussed. (C) 2010 Optical Society of America

引用

页码：5799 / 5805

页数：7

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