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Refractive index change in ytterbium-doped fibers induced by photodarkening and thermal bleaching
| العنوان: | Refractive index change in ytterbium-doped fibers induced by photodarkening and thermal bleaching |
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| المؤلفون: | Ye, Changgeng, Montiel i Ponsoda, Joan J., Tervonen, Ari, Honkanen, Seppo |
| المصدر: | Applied Optics; October 2010, Vol. 49 Issue: 30 p5799-5805, 7p |
| مستخلص: | 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 1080nm, and it approaches a saturated level, which is in the order of 10^−6∼10^−5 for the tested fiber samples. It is found that the value of this refractive index change is linearly proportional to the photodarkening-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∼0.3)×10^−5. The influence of the photodarkening-induced refractive index change on fiber lasers is discussed. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 1559128X 21553165 |
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