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Proceedings Paper

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

Paper Details

Date Published: 11 February 2011
PDF: 8 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142A (11 February 2011); doi: 10.1117/12.874312
Show Author Affiliations
Changgeng Ye, Aalto Univ. School of Science and Technology (Finland)
Joan J. Montiel i Ponsoda, Aalto Univ. School of Science and Technology (Finland)
Ari Tervonen, Aalto Univ. School of Science and Technology (Finland)
Seppo Honkanen, Aalto Univ. School of Science and Technology (Finland)


Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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