Thermo-optical effects in high-power Ytterbium-doped fiber amplifiers | Zendy

Kristian Rymann Hansen | Zendy; Thomas Tanggaard Alkeskjold | Zendy; Jes Broeng | Zendy; Jesper Lægsgaard | Zendy

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Thermo-optical effects in high-power Ytterbium-doped fiber amplifiers

Author(s) -

Kristian Rymann Hansen,

Thomas Tanggaard Alkeskjold,

Jes Broeng,

Jesper Lægsgaard

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.023965

Subject(s) - materials science , optics , refractive index , laser beam quality , ytterbium , mode volume , thermal , amplifier , optical fiber , beam (structure) , fiber , optoelectronics , dispersion shifted fiber , double clad fiber , doping , fiber optic sensor , physics , laser , laser beams , cmos , meteorology , composite material

We investigate the effect of temperature gradients in high-power Yb-doped fiber amplifiers by a numerical beam propagation model, which takes thermal effects into account in a self-consistent way. The thermally induced change in the refractive index of the fiber leads to a thermal lensing effect, which decreases the effective mode area. Furthermore, it is demonstrated that the thermal lensing effect may lead to effective multi-mode behavior, even in single-mode designs, which could possibly lead to degradation of the output beam quality.

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