Abstract

A comparative analysis of the mode field distributions of the pump radiation in a double-clad fiber laser and in an M-profile fiber laser shows the superiority of the latter design with respect to absorption efficiency. This efficiency is accurately modeled by the modal analysis, allowing the description of the lasing field within the same model. Based on this approach, the optimization of the recently invented M-profile fiber laser was carried out, leading to an output power of nearly 10 W at λ = 1050 nm with a slope efficiency of 54% utilizing a fiber length of 190 cm.

© 1998 Optical Society of America

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References

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  1. P. Glas, M. Naumann, A. Schirrmacher, “A novel design for high brightness fiber lasers pumped by high power diodes,” J. Mod. Opt. 43, 879–887 (1996).
    [CrossRef]
  2. L. Zenteno, “High-power double-clad fiber lasers,” J. Lightwave Technol. 11, 1435–1446 (1993).
    [CrossRef]
  3. H. Zellmer, U. Willamowski, A. Tünnermann, H. Welling, S. Unger, V. Reichel, H.-R. Müller, J. Kirchhof, P. Albers, “High-power cw neodymium-doped fiber laser operating at 9.2 W with high beam quality,” Opt. Lett. 20, 578–580 (1995).
    [CrossRef] [PubMed]
  4. H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
    [CrossRef]
  5. A. Liu, K. Ueda, “The absorption characteristics of circular, offset, and rectangular double clad fibers,” Opt. Commun. 132, 511–518 (1996).
    [CrossRef]
  6. R. Boneß, D. Tolksdorf, “Numerische Verfahren zur Berechnung der Feldstaerke in Gradientenlichtwellenleitern,” Nachrichtentech. Elektron. 36, 37–38 (1986).
  7. A. Snyder, J. Love, Optical Waveguide Theory (Chapman & Hall, London, 1983).
  8. P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
    [CrossRef]
  9. The diode laser module was fabricated by the Fraunhofer Institute, Aachen, Germany.

1997 (1)

P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
[CrossRef]

1996 (2)

A. Liu, K. Ueda, “The absorption characteristics of circular, offset, and rectangular double clad fibers,” Opt. Commun. 132, 511–518 (1996).
[CrossRef]

P. Glas, M. Naumann, A. Schirrmacher, “A novel design for high brightness fiber lasers pumped by high power diodes,” J. Mod. Opt. 43, 879–887 (1996).
[CrossRef]

1995 (1)

1993 (2)

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

L. Zenteno, “High-power double-clad fiber lasers,” J. Lightwave Technol. 11, 1435–1446 (1993).
[CrossRef]

1986 (1)

R. Boneß, D. Tolksdorf, “Numerische Verfahren zur Berechnung der Feldstaerke in Gradientenlichtwellenleitern,” Nachrichtentech. Elektron. 36, 37–38 (1986).

Albers, P.

Boneß, R.

R. Boneß, D. Tolksdorf, “Numerische Verfahren zur Berechnung der Feldstaerke in Gradientenlichtwellenleitern,” Nachrichtentech. Elektron. 36, 37–38 (1986).

Cao, J. D.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Glas, P.

P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
[CrossRef]

P. Glas, M. Naumann, A. Schirrmacher, “A novel design for high brightness fiber lasers pumped by high power diodes,” J. Mod. Opt. 43, 879–887 (1996).
[CrossRef]

Kirchhof, J.

Laliberte, B. M.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Liu, A.

A. Liu, K. Ueda, “The absorption characteristics of circular, offset, and rectangular double clad fibers,” Opt. Commun. 132, 511–518 (1996).
[CrossRef]

Love, J.

A. Snyder, J. Love, Optical Waveguide Theory (Chapman & Hall, London, 1983).

Minns, R. A.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Müller, H.-R.

Naumann, M.

P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
[CrossRef]

P. Glas, M. Naumann, A. Schirrmacher, “A novel design for high brightness fiber lasers pumped by high power diodes,” J. Mod. Opt. 43, 879–887 (1996).
[CrossRef]

Pertsch, Th.

P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
[CrossRef]

Po, H.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Reichel, V.

Robinson, R. F.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Rockney, B. H.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Schirrmacher, A.

P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
[CrossRef]

P. Glas, M. Naumann, A. Schirrmacher, “A novel design for high brightness fiber lasers pumped by high power diodes,” J. Mod. Opt. 43, 879–887 (1996).
[CrossRef]

Snyder, A.

A. Snyder, J. Love, Optical Waveguide Theory (Chapman & Hall, London, 1983).

Tolksdorf, D.

R. Boneß, D. Tolksdorf, “Numerische Verfahren zur Berechnung der Feldstaerke in Gradientenlichtwellenleitern,” Nachrichtentech. Elektron. 36, 37–38 (1986).

Tricca, R. R.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Tünnermann, A.

Ueda, K.

A. Liu, K. Ueda, “The absorption characteristics of circular, offset, and rectangular double clad fibers,” Opt. Commun. 132, 511–518 (1996).
[CrossRef]

Unger, S.

Welling, H.

Willamowski, U.

Zang, Y. H.

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

Zellmer, H.

Zenteno, L.

L. Zenteno, “High-power double-clad fiber lasers,” J. Lightwave Technol. 11, 1435–1446 (1993).
[CrossRef]

Electron. Lett. (1)

H. Po, J. D. Cao, B. M. Laliberte, R. A. Minns, R. F. Robinson, B. H. Rockney, R. R. Tricca, Y. H. Zang, “High power neodymium-doped single transverse mode fibre laser,” Electron. Lett. 9(17), 1500–1501 (1993).
[CrossRef]

J. Lightwave Technol. (1)

L. Zenteno, “High-power double-clad fiber lasers,” J. Lightwave Technol. 11, 1435–1446 (1993).
[CrossRef]

J. Mod. Opt. (1)

P. Glas, M. Naumann, A. Schirrmacher, “A novel design for high brightness fiber lasers pumped by high power diodes,” J. Mod. Opt. 43, 879–887 (1996).
[CrossRef]

Nachrichtentech. Elektron. (1)

R. Boneß, D. Tolksdorf, “Numerische Verfahren zur Berechnung der Feldstaerke in Gradientenlichtwellenleitern,” Nachrichtentech. Elektron. 36, 37–38 (1986).

Opt. Commun. (2)

P. Glas, M. Naumann, A. Schirrmacher, S. Unger, Th. Pertsch, “A high power neodymium doped fiber laser using a novel fiber geometry,” Opt. Commun. 141, 336–342 (1997).
[CrossRef]

A. Liu, K. Ueda, “The absorption characteristics of circular, offset, and rectangular double clad fibers,” Opt. Commun. 132, 511–518 (1996).
[CrossRef]

Opt. Lett. (1)

Other (2)

The diode laser module was fabricated by the Fraunhofer Institute, Aachen, Germany.

A. Snyder, J. Love, Optical Waveguide Theory (Chapman & Hall, London, 1983).

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Figures (4)

Fig. 1
Fig. 1

(a) Field distribution of LP mp modes of the pump field of (a) an M-profile fiber and (b) a double-clad fiber. The inset in (a) shows the geometry of the M-profile fiber and relevant data. The inset in (b) shows the geometry of the double-clad fiber along with some data.

Fig. 2
Fig. 2

Fiber length necessary to absorb a fraction of the pump power depending on the part of the angular spectrum of the pump source: (a) M profile and (b) double clad.

Fig. 3
Fig. 3

Output versus input power of an optimized M-profile fiber laser of approximately 190-cm length. The mirrors are butt-coupled, possessing reflectivities R 1 = 0.98 (λ = 1050 nm; high transmission at the pump wavelength, λ = 805 nm) and R 2 = 0.55 (λ = 1050 nm). The slope efficiency is obtained by a linear fit.

Fig. 4
Fig. 4

Near-field intensity distribution.

Equations (4)

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diameter of the ring diameter of the core   DCD 2 .
θ x = sin - 1   λ k x / 2 π , θ y = sin - 1   λ k y / 2 π ,
d 2 Ψ r d r 2 + 1 r d Ψ r d r + k 2 n 2 r - β 2 - m 2 r 2 Ψ r = 0 ,
Δ = n 1 2 - n 2 2 / 2 n 1 2 ,

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