Abstract

A branch arm filtering technique is firstly proposed and experimentally demonstrated. A tunable band pass filter is inserted into one branch arm of the Mach-Zehnder type resonator instead of into the common arm as usual, in the coherent combining of two tunable fiber lasers. The arrangement improves the efficiency of the laser without obvious spectral quality penalty. The laser can be tuned from 1530 nm to 1570 nm with little power fluctuation, which is limited by the tuning range of the filter. A novel scaling scheme is also proposed, allowing the technique to be applied to the tuning of an extremely high power laser with a low power filter. The technique is expected to be compatible with other kinds of lasers such as linearly polarized lasers, Michelson type resonator and bulk lasers as well.

© 2005 Optical Society of America

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    [CrossRef]
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    [PubMed]
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    [CrossRef] [PubMed]
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2005 (5)

2004 (5)

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “975-nm single-mode laser source: external coherent combining of two pigtailed laser diodes,” IEEE J. Sel. Top. Quantum Electron. 10, 1033–1038 (2004).
[CrossRef]

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

L. Liu, Y. Zhou, F. Kong, Y. C. Chen, and K. K. Lee, “Phase locking in a fiber laser array with varying path lengths,” Appl. Phys. Lett. 85, 4837–4839 (2004).
[CrossRef]

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “Coherent combining of Q-switched fibre lasers,” Electron Lett. 40, 1254–1255 (2004).
[CrossRef]

Y. Jeong, J. K. Sahu, D. N. Payne, and J. Nilsson, “Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power,” Opt. Express 12, 6088–6092 (2004), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-25-6088
[CrossRef] [PubMed]

2003 (2)

2002 (3)

2001 (1)

M. Tondusson, C. Froehly, V. Kermene, and M. Vampouille, “Coherent combination of four laser beams in a multi-axis Fourier cavity using a diffractive optical element,” J. Opt. A: Pure Appl. Opt. 3, 521–526 (2001).
[CrossRef]

1999 (2)

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

V. A. Kozlov, J. Hernandez-Cordero, and T. F. Morse, “All-fiber coherent beam combining of fiber lasers,” Opt. Lett. 24, 1814–1816 (1999).
[CrossRef]

1993 (1)

1988 (1)

J. R. Leger, M. L. Scott, and W. B. Veldkamp, “Coherent addition of AlGaAs lasers using microlenses and diffractive coupling,” Appl. Phys. Lett. 52, 1771–1773 (1988).
[CrossRef]

1972 (1)

P. W. Smith, “Mode selection in lasers,” Proc. IEEE 60, 422–440 (1972).
[CrossRef]

Abranyos, Y.

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

Barthelemy, A.

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

Barthélémy, A.

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “Coherent combining of Q-switched fibre lasers,” Electron Lett. 40, 1254–1255 (2004).
[CrossRef]

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “975-nm single-mode laser source: external coherent combining of two pigtailed laser diodes,” IEEE J. Sel. Top. Quantum Electron. 10, 1033–1038 (2004).
[CrossRef]

D. Sabourdy, V. Kermène, A. Desfarges-Berthelemot, L. Lefort, A. Barthélémy, P. Even, and D. Pureur, “Efficient coherent combining of widely tunable fiber lasers,” Opt. Express 11, 87–97 (2003), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87
[CrossRef] [PubMed]

Bo, Y.

Bruesselbach, H.

Chen, S.-P.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Chen, Y.

Chen, Y. C.

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

L. Liu, Y. Zhou, F. Kong, Y. C. Chen, and K. K. Lee, “Phase locking in a fiber laser array with varying path lengths,” Appl. Phys. Lett. 85, 4837–4839 (2004).
[CrossRef]

Colombeau, B.

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

Dandliker, R.

Davidson, N.

Desfarges-Berthelemot, A.

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “Coherent combining of Q-switched fibre lasers,” Electron Lett. 40, 1254–1255 (2004).
[CrossRef]

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “975-nm single-mode laser source: external coherent combining of two pigtailed laser diodes,” IEEE J. Sel. Top. Quantum Electron. 10, 1033–1038 (2004).
[CrossRef]

D. Sabourdy, V. Kermène, A. Desfarges-Berthelemot, L. Lefort, A. Barthélémy, P. Even, and D. Pureur, “Efficient coherent combining of widely tunable fiber lasers,” Opt. Express 11, 87–97 (2003), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87
[CrossRef] [PubMed]

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

Eckhouse, V.

Etson, C.

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

Even, P.

Friesem, A. A.

Froehly, C.

M. Tondusson, C. Froehly, V. Kermene, and M. Vampouille, “Coherent combination of four laser beams in a multi-axis Fourier cavity using a diffractive optical element,” J. Opt. A: Pure Appl. Opt. 3, 521–526 (2001).
[CrossRef]

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

Gavrielides, A.

Guo, L.

Guo, R.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Guyenot, V.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Hernandez-Cordero, J.

Hofer, S.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Ishaaya, A. A.

Jackson, S. D.

M. Pollnau and S. D. Jackson, “Mid-infrared fiber lasers,” Topics Appl. Phys. 89, 219–253 (2003).

Jeong, Y.

Jones, D. C.

Kermene, V.

M. Tondusson, C. Froehly, V. Kermene, and M. Vampouille, “Coherent combination of four laser beams in a multi-axis Fourier cavity using a diffractive optical element,” J. Opt. A: Pure Appl. Opt. 3, 521–526 (2001).
[CrossRef]

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

Kermene, Y

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

Kermène, V.

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “Coherent combining of Q-switched fibre lasers,” Electron Lett. 40, 1254–1255 (2004).
[CrossRef]

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “975-nm single-mode laser source: external coherent combining of two pigtailed laser diodes,” IEEE J. Sel. Top. Quantum Electron. 10, 1033–1038 (2004).
[CrossRef]

D. Sabourdy, V. Kermène, A. Desfarges-Berthelemot, L. Lefort, A. Barthélémy, P. Even, and D. Pureur, “Efficient coherent combining of widely tunable fiber lasers,” Opt. Express 11, 87–97 (2003), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87
[CrossRef] [PubMed]

Kong, F.

L. Liu, Y. Zhou, F. Kong, Y. C. Chen, and K. K. Lee, “Phase locking in a fiber laser array with varying path lengths,” Appl. Phys. Lett. 85, 4837–4839 (2004).
[CrossRef]

Kozlov, V. A.

Lee, K. K.

L. Liu, Y. Zhou, F. Kong, Y. C. Chen, and K. K. Lee, “Phase locking in a fiber laser array with varying path lengths,” Appl. Phys. Lett. 85, 4837–4839 (2004).
[CrossRef]

Lefort, L.

D. Sabourdy, V. Kermène, A. Desfarges-Berthelemot, L. Lefort, A. Barthélémy, P. Even, and D. Pureur, “Efficient coherent combining of widely tunable fiber lasers,” Opt. Express 11, 87–97 (2003), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87
[CrossRef] [PubMed]

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

Leger, J. R.

J. R. Leger, M. L. Scott, and W. B. Veldkamp, “Coherent addition of AlGaAs lasers using microlenses and diffractive coupling,” Appl. Phys. Lett. 52, 1771–1773 (1988).
[CrossRef]

Li, Y.-G.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Liem, S.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Limpert, J.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Liu, L.

L. Liu, Y. Zhou, F. Kong, Y. C. Chen, and K. K. Lee, “Phase locking in a fiber laser array with varying path lengths,” Appl. Phys. Lett. 85, 4837–4839 (2004).
[CrossRef]

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

Lu, K.-C.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Mahodaux, C.

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

Mangir, M. S.

Matsuo, K.

A. Shirakawa, K. Matsuo, and K. Ueda, “Power summation and bandwidth narrowing in coherently-coupled fiber laser array,” proceedings of CLEO US 2004, San Francisco, CThGG2 (2004).

Menard, S.

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

Minden, M.

Morel, J.

Morse, T. F.

Nilsson, J.

Padilla, A.

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

Payne, D. N.

Peng, Q.

Peschel, T.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Peterson, P.

Pollnau, M.

M. Pollnau and S. D. Jackson, “Mid-infrared fiber lasers,” Topics Appl. Phys. 89, 219–253 (2003).

Pureur, D.

D. Sabourdy, V. Kermène, A. Desfarges-Berthelemot, L. Lefort, A. Barthélémy, P. Even, and D. Pureur, “Efficient coherent combining of widely tunable fiber lasers,” Opt. Express 11, 87–97 (2003), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87
[CrossRef] [PubMed]

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

Reich, M.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Rogers, J. L.

Roser, F.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Sabourdy, D.

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “975-nm single-mode laser source: external coherent combining of two pigtailed laser diodes,” IEEE J. Sel. Top. Quantum Electron. 10, 1033–1038 (2004).
[CrossRef]

D. Sabourdy, A. Desfarges-Berthelemot, V. Kermène, and A. Barthélémy, “Coherent combining of Q-switched fibre lasers,” Electron Lett. 40, 1254–1255 (2004).
[CrossRef]

D. Sabourdy, V. Kermène, A. Desfarges-Berthelemot, L. Lefort, A. Barthélémy, P. Even, and D. Pureur, “Efficient coherent combining of widely tunable fiber lasers,” Opt. Express 11, 87–97 (2003), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87
[CrossRef] [PubMed]

D. Sabourdy, Y Kermene, A. Desfarges-Berthelemot, L. Lefort, A. Barthelemy, C. Mahodaux, and D. Pureur, “Power scaling of fibre lasers with all-fibre interferometric cavity,” Electron Lett. 38, 692–693 (2002).
[CrossRef]

Sahu, J. K.

Saitou, T.

Schreiber, T.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Scott, M. L.

J. R. Leger, M. L. Scott, and W. B. Veldkamp, “Coherent addition of AlGaAs lasers using microlenses and diffractive coupling,” Appl. Phys. Lett. 52, 1771–1773 (1988).
[CrossRef]

Sekiguchi, T.

Shimshi, L.

Shirakawa, A.

A. Shirakawa, T. Saitou, T. Sekiguchi, and K.-i. Ueda, “Coherent addition of fiber lasers by use of a fiber coupler,” Opt. Express 10, 1167–1172 (2002), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-21-1167
[PubMed]

A. Shirakawa, K. Matsuo, and K. Ueda, “Power summation and bandwidth narrowing in coherently-coupled fiber laser array,” proceedings of CLEO US 2004, San Francisco, CThGG2 (2004).

Simpson, T. B.

Smith, P. W.

P. W. Smith, “Mode selection in lasers,” Proc. IEEE 60, 422–440 (1972).
[CrossRef]

Sun, Z.

Tondusson, M.

M. Tondusson, C. Froehly, V. Kermene, and M. Vampouille, “Coherent combination of four laser beams in a multi-axis Fourier cavity using a diffractive optical element,” J. Opt. A: Pure Appl. Opt. 3, 521–526 (2001).
[CrossRef]

Tunnermann, A.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Ueda, K.

A. Shirakawa, K. Matsuo, and K. Ueda, “Power summation and bandwidth narrowing in coherently-coupled fiber laser array,” proceedings of CLEO US 2004, San Francisco, CThGG2 (2004).

Ueda, K.-i.

Vampouille, M.

M. Tondusson, C. Froehly, V. Kermene, and M. Vampouille, “Coherent combination of four laser beams in a multi-axis Fourier cavity using a diffractive optical element,” J. Opt. A: Pure Appl. Opt. 3, 521–526 (2001).
[CrossRef]

S. Menard, M. Vampouille, A. Desfarges-Berthelemot, V. Kermene, B. Colombeau, and C. Froehly, “Highly efficient phase locking of four diode pumped Nd:YAG laser beams,” Opt. Commun. 160, 344–353 (1999).
[CrossRef]

Veldkamp, W. B.

J. R. Leger, M. L. Scott, and W. B. Veldkamp, “Coherent addition of AlGaAs lasers using microlenses and diffractive coupling,” Appl. Phys. Lett. 52, 1771–1773 (1988).
[CrossRef]

Wang, H.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Woodtli, A.

Xu, T.-W.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Xu, Z.

Yang, X.

Zellmer, H.

A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

Zhang, Y.

S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

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Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

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[CrossRef]

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S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
[CrossRef]

Appl. Phys. Lett. (3)

Y. Zhou, L. Liu, C. Etson, Y. Abranyos, A. Padilla, and Y. C. Chen, “Phase locking of a two-dimensional laser array by controlling the far-field pattern,” Appl. Phys. Lett. 84, 3025–3027 (2004).
[CrossRef]

L. Liu, Y. Zhou, F. Kong, Y. C. Chen, and K. K. Lee, “Phase locking in a fiber laser array with varying path lengths,” Appl. Phys. Lett. 85, 4837–4839 (2004).
[CrossRef]

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S.-P. Chen, Y.-G. Li, J.-P. Zhu, H. Wang, Y. Zhang, T.-W. Xu, R. Guo, and K.-C. Lu, “All fibre ring cavity watt-level erbium-ytterbium co-doped fibre laser,” J. Opt. A: Pure Appl. Opt. 7, 310–314 (2005).
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A. Tunnermann, S. Hofer, S. Liem, J. Limpert, M. Reich, F. Roser, T. Schreiber, H. Zellmer, T. Peschel, and V. Guyenot, “Power scaling of high-power fiber lasers and amplifiers,” Laser Phys. 15, 107–117 (2005).

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Figures (7)

Fig. 1.
Fig. 1.

Experimental setup of the tunable Mach-Zehnder type fiber laser. The TBF is arranged at one of the four points indicated by the dashed frames. TBF: Tunable Bandpass Filter; PC: Polarization Controller; LD: 110 mW 980 nm Laser Diode; WDM: Wavelength Division Multiplexer; EDF: 7.2m Erbium Doped Fiber; C: 3 dB Coupler; HR: High Reflectivity

Fig. 2.
Fig. 2.

Output power and spectra properties of the tunable fiber lasers. ηs: slope efficiency.

Fig. 3.
Fig. 3.

Spectra of the HR port branch arm filtered laser under PLD1 =110mW. The purple, green, blue and red lines correspond to PLD2 =0, 3.8, 5.2, and 110 mW, respectively.

Fig. 4.
Fig. 4.

Suppression power versus wavelength and PLD1 . Rectangles in (a) are measured with PLD1 at its maximum power. Blue dots in (a) are the SMSR of the laser with both LDs at their maximum power. The suppression power means the minimum PLD2 needed to thoroughly suppress undesired noisy laser oscillation.

Fig. 5
Fig. 5

Continuously scanned spectra of the HR port branch arm filtered fiber laser.

Fig. 6.
Fig. 6.

Power and spectra versus wavelength of the HR port branch arm filtered fiber laser. (b) and (c) correspond to the PC optimized at 1550 nm and at each wavelength, respectively.

Fig. 7.
Fig. 7.

Scaling schemes of the branch arm filtering technique.

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