Distributed feedback ytterbium fiber laser: experiment and analytical model

Maxim A. Nikulin; Dmitriy E. Churin; Aleksandr A. Vlasov; Evgeny V. Podivilov

doi:10.1364/JOSAB.27.001414

Journal of the Optical Society of America B
Vol. 27,
Issue 7,
pp. 1414-1420
(2010)
•https://doi.org/10.1364/JOSAB.27.001414

Distributed feedback ytterbium fiber laser: experiment and analytical model

Maxim A. Nikulin, Dmitriy E. Churin, Aleksandr A. Vlasov, and Evgeny V. Podivilov

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Maxim A. Nikulin, Dmitriy E. Churin, Aleksandr A. Vlasov, and Evgeny V. Podivilov, "Distributed feedback ytterbium fiber laser: experiment and analytical model," J. Opt. Soc. Am. B 27, 1414-1420 (2010)

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Abstract

We compare the slope efficiency of a 1093 nm ytterbium distributed feedback fiber laser obtained in the experiment to the value calculated within the analytical model. The measured reflection and transmission spectra of the laser cavity, which is formed by a 4 cm long π-shifted fiber Bragg grating, allowed us to determine the cavity parameters employed in the analytical model. We took into account pump absorption that is significant for the model of ytterbium fiber lasers. A good agreement between the theory and the experiment is demonstrated. The considered analytical model is suitable for optimizing distributed feedback fiber laser parameters.

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Fiber Properties (Section 2)
$λ_{p} = 976 nm$	$g_{p} \approx α_{p} = 0.64 {cm}^{- 1}$	$α_{p}^{*} = 2.8 \times 10^{- 2} {cm}^{- 1}$	$P_{s} = 0.5 mW$
$λ_{l} = 1093 nm$	$g_{l} = 2.3 \times 10^{- 2} {cm}^{- 1}$	$α_{l} = 2.4 \times 10^{- 4} {cm}^{- 1}$	$I_{s} / P_{s} = 25$
DFB FL Cavity Resonance (Section 3)
$δ ν = 13.7 MHz$	$1 - R_{b} = 0.27$	$1 - R_{w} = 0.11$	$T = 7.5 \times 10^{- 3}$
Cavity Parameters
$α_{l}^{*} = 3.8 \times 10^{- 3} {cm}^{- 1}$	$T_{1} = 2.1 \times 10^{- 4}$	$κ = 2.68 {cm}^{- 1}$	$\| z_{2} \| = 2 cm$
$T_{1} / T_{2} = 2.6$	$T_{2} = 0.82 \times 10^{- 4}$	$δ n_{g} = 0.94 \times 10^{- 4}$	$\| z_{2} \| - \| z_{1} \| = 0.177 cm$

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Journal of the Optical Society of America B