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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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]

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]

CLEO 2004 (1)

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).

Electron Lett. (2)

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]

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

IEEE J. Sel. Top. Quantum Electron. (1)

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]

J. Opt. A: Pure Appl. Opt. (2)

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]

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]

Laser Phys. (1)

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).

Opt. Commun. (1)

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]

Opt. Express (5)

T. B. Simpson, A. Gavrielides and P. Peterson, �??Extraction characteristics of a dual fiber compound cavity,�?? Opt. Express 10, 1060-1073 (2002), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-20-1060">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-20-1060</a>
[PubMed]

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), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-21-1167">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-21-1167</a>
[PubMed]

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), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-2-87</a>
[CrossRef] [PubMed]

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), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-25-6088">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-25-6088</a>
[CrossRef] [PubMed]

A. A. Ishaaya, V. Eckhouse, L. Shimshi, N. Davidson and A. A. Friesem, �??Improving the output beam quality of multimode laser resonators,�?? Opt. Express 13, 2722-2730 (2005), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-13-7-2722">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-13-7-2722</a>
[CrossRef] [PubMed]

Opt. Lett. (4)

Proc. IEEE (1)

P. W. Smith, �??Mode selection in lasers,�?? Proc. IEEE 60, 422-440 (1972).
[CrossRef]

Topics Appl. Phys. (1)

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

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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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