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Proceedings Paper

Modeling and measurement of ytterbium fiber laser generation spectrum
Author(s): Sergey I. Kablukov; Ekaterina A. Zlobina; Evgeniy V. Podivilov; Sergey A. Babin
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Paper Abstract

A generation spectrum of a fiber laser becomes broader with increasing generation power. The spectra are rather narrow at low power and become comparable with fiber Bragg gratings (FBG) width at high power. It has been shown that the spectral broadening of a fiber laser can be described analytically if the generation spectrum is much narrower than the FBG width. The developed theory has been compared with experiment. Double clad Yb-doped fiber laser of up to 10 W output power is used in the experiment. Scanning Fabry-Perot interferometer with resolution down to 1.2 pm is applied for accurate spectral measurements. At power level less then 1 W a self-sustained pulsation regime accompanied by a narrow-line self-sweeping is observed. At higher power a quasi-CW generation regime with multiple longitudinal modes is established. Investigation of the regime shows linear increase of the generation width with generation power growth. Slope of the dependence has excellent agreement with the theory, but an additive quantity should be added to describe an absolute value that makes significant contribution at low powers. It has been shown that at low powers a spatial hole burning has to be considered. Theoretical model describing the hole burning effect for multimode cw generation is also developed. After inclusion of the hole burning effect the model starts to agree quantitatively with the linewidth measurements both at low and high powers.

Paper Details

Date Published: 11 May 2012
PDF: 9 pages
Proc. SPIE 8433, Laser Sources and Applications, 843305 (11 May 2012); doi: 10.1117/12.922190
Show Author Affiliations
Sergey I. Kablukov, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)
Ekaterina A. Zlobina, Novosibirsk State Univ. (Russian Federation)
Evgeniy V. Podivilov, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)
Sergey A. Babin, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 8433:
Laser Sources and Applications
Thomas Graf; Jacob I. Mackenzie; Helena Jelínková; John Powell, Editor(s)

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