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Fundamental mode operation of a 19-core phase-locked Yb-doped fiber amplifier

Yanming Huo, Peter K. Cheo, and George G. King

Open Access Open Access

Abstract

We demonstrate, theoretically and experimentally, a high power/energy 19-core Yb-doped fiber amplifier that operates in its fundamental in-phase mode. The calculated result using an improved coupled mode theory with gain shows that, with a Gaussian beam as seed, the in-phase supermode dominates. Experimentally, we use a Q-switched single-core fiber laser with single transverse mode as seed, and amplify it with a 5.8 m 19-core fiber. The measured near and far fields are close to the in-phase supermode. The measured M2 factor of the amplified beam is 1.5, which is close to the theoretical value. A pulse energy gain of 20 dB is obtained with the amplified pulse energy up to 0.65 mJ at a repetition frequency of 5 kHz. No appreciable stimulated Brillouin scattering is observed at this power level.

©2004 Optical Society of America

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Supplementary Material (1)

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Figures (11)
Fig. 1.
Fig. 1. Configuration of the cores in a 19-core fiber amplifier.

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Fig. 2.
Fig. 2. (197 KB movie) 2D view of the near field of the in-phase supermode.

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Fig. 3.
Fig. 3. 3D view of the near field (a) and far field (b) intensity distributions of the amplified beam with σ=2d.

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Fig. 4.
Fig. 4. M2 factor of amplified beam as a function of beam waist of the input Gaussian beam.

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Fig. 5.
Fig. 5. 3D view of the near field (a) and far field (b) intensity distributions of the amplified beam with arbitrary input.

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Fig. 6.
Fig. 6. (a) Picture of the 19-core fiber facet, and (b) configuration of the cores.

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Fig. 7.
Fig. 7. Experimental setup.

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Fig. 8.
Fig. 8. 3D view of the measured (a) near field, and (b) far field of the amplified beam.

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Fig. 9.
Fig. 9. Measurement of M2 factor of the amplified beam.

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Fig. 10.
Fig. 10. (a) Seed pulse shape, (b) seed spectrum, (c) amplified pulse shape, and (d) amplified pulse spectrum.

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Fig. 11.
Fig. 11. Pulse energy gain and pulse energy vs pump power.

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Equations (14)

Equations on this page are rendered with MathJax. Learn more.

d A d z = i K A ,
K = B + C − 1 K ¯ ,
C lm = β m ∫ ε l ( x , y ) ε m ( x , y ) d x d y ,
K ¯ lm = k 0 2 2 ∫ [ n 2 ( x , y ) − n m 2 ( x , y ) ] ε l ( x , y ) ε m ( x , y ) d x d y ,
Δ n eff = − i λ s 4 π ( g − α ) ,
d A l ( z ) dz = i ∑ m K lm A m ( z ) + ∑ m ∑ q ∂ K lm ∂ n q { λ s 4 π [ g q ( z ) − α ] } A m ( z ) ,
g q ( z ) = N 2 q ( z ) σ es − N 1 q ( z ) σ as ,
N 1 q ( z ) = N 0 ⌊ σ ep I p / h ν p + σ es I sq ( z ) / h ν s + 1 / τ ⌋ σ ap I p / h ν p + σ as I sq ( z ) / h ν s + σ ep I p / h ν p + σ es I sq ( z ) / h ν s + 1 / τ ,
N 2 q ( z ) = N 0 − N 1 q ( z ) ,
I sq ( z ) = ∑ l ∑ m E qlm A l ( z ) A m * ( z ) / 2 A co ,
E qlm = ∫ q ε l ( x , y ) ε m ( x , y ) d x d y ,
P s ( z ) = 1 2 ∑ l ∑ m D lm A l ( z ) A m * ( z ) ,
D lm = ∫ ∞ ε l ( x , y ) ε m ( x , y ) d x d y ,
W 2 ( z ) = W 0 2 + M 4 λ 2 π 2 W 0 2 ( z − z 0 ) 2
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