Measurement of photodarkening-induced refractive index change in ytterbium doped fibers by modal interference

Changgeng Ye; Joan J. Montiel i Ponsoda; Ari Tervonen; Seppo Honkanen

doi:10.1117/12.874312

10 February 2011 Measurement of photodarkening-induced refractive index change in ytterbium doped fibers by modal interference

Changgeng Ye, Joan J. Montiel i Ponsoda, Ari Tervonen, Seppo Honkanen

Author Affiliations +

Proceedings Volume 7914, Fiber Lasers VIII: Technology, Systems, and Applications; 79142A (2011) https://doi.org/10.1117/12.874312
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

Changgeng Ye, Joan J. Montiel i Ponsoda, Ari Tervonen, and 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); https://doi.org/10.1117/12.874312

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