10 February 2011 Measurement of photodarkening-induced refractive index change in ytterbium doped fibers by modal interference
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Abstract
By using a modal interference method, photodarkening-induced refractive index change in ytterbium doped fibers is measured with high accuracy. This refractive index change is positive at the ytterbium lasing wavelengths near 1080nm, and it gradually approaches a saturated level over time. It is found that the refractive index change is linearly proportional to the photodarkening-induced excess loss at an arbitrary probe wavelength in the visible band. The maximum refractive index change in our experiment is close to 1×10-5. The origin and influence of the photodarkening-induced refractive index change on fiber lasers is discussed.
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Changgeng Ye, Changgeng Ye, Joan J. Montiel i Ponsoda, Joan J. Montiel i Ponsoda, Ari Tervonen, Ari Tervonen, Seppo Honkanen, Seppo Honkanen, } "Measurement of photodarkening-induced refractive index change in ytterbium doped fibers by modal interference", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142A (10 February 2011); doi: 10.1117/12.874312; https://doi.org/10.1117/12.874312
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