Thermal bleaching of photodarkening in ytterbium-doped fibers

被引：4
|
作者：
Soderlund, Mikko J. [1 ]
Montiel i Ponsoda, Joan J. [1 ]
Koplow, Jeffrey P. [2 ]
Honkanen, Seppo [1 ]
机构：
[1] Aalto Univ, Sch Sci & Technol, Tietotie 3, Espoo, Finland
[2] Sandia Natl Labs, Livermore, CA 94551 USA
来源：
FIBER LASERS VII: TECHNOLOGY, SYSTEMS, AND APPLICATIONS | 2010年 / 7580卷
关键词：
Ytterbium; photodarkening; color center; bleaching;
D O I：
10.1117/12.842095
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study thermal bleaching of photodarkening-induced loss in ytterbium-doped fibers. Post-irradiation heating of a photodarkened fiber is shown to result in further increase the loss which is attributed to both a permanent increase of loss-inducing color centers and a temperature-dependent broadening of the absorption spectrum. The permanent heat-induced increase of loss is believed to indicate presence of an intermediate energy state in the NIRpho tochemical mechanism for photodarkening. Further, we apply the demarcation energy curve approach to derive the thermal activation energy of the induced defects. For the studied commercial 20-mu m-core-diameter LMA fiber, the energy distribution consists of a single peak, located at 1.3 eV with a FWHM of 0.31 eV.
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页数：8
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