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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 30 — Oct. 20, 2010
  • pp: 5799–5805

Refractive index change in ytterbium-doped fibers induced by photodarkening and thermal bleaching

Changgeng Ye, Joan J. Montiel i Ponsoda, Ari Tervonen, and Seppo Honkanen  »View Author Affiliations


Applied Optics, Vol. 49, Issue 30, pp. 5799-5805 (2010)
http://dx.doi.org/10.1364/AO.49.005799


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Abstract

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 1080 nm , 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.

© 2010 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3510) Lasers and laser optics : Lasers, fiber
(160.5690) Materials : Rare-earth-doped materials

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 20, 2010
Manuscript Accepted: September 9, 2010
Published: October 14, 2010

Citation
Changgeng Ye, Joan J. Montiel i Ponsoda, Ari Tervonen, and Seppo Honkanen, "Refractive index change in ytterbium-doped fibers induced by photodarkening and thermal bleaching," Appl. Opt. 49, 5799-5805 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-30-5799

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