Abstract

Coherent beam combination of fiber laser array is an important technology of realize high-power, high-radiance fiber laser system. In this paper, Master Oscillator-Power Amplifier scheme is used to realize phase controlling of three ytterbium fiber amplifiers, the experiment results of both two and three fiber amplifiers are given and compared. Far-field patterns with different fill factor are studied experimentally. We perform optical phase-noise measurements of a commercial 1-W ytterbium fiber amplifier using our phase control electronics, the dominant phase noises of the 1-W fiber amplifier are at frequencies below one kilohertz.

© 2008 Optical Society of America

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References

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  1. S. J. Agust, T. Y. Fan, and A. Sanchez, "Coherent beam combining and phase noise measurements of ytterbium fiber amplifiers," Opt. Lett. 29, 474-476 (2004).
    [CrossRef]
  2. J. Morel, "Coherent coupling of an array of Nd3+ doped single-mode fiber lasers using an intracavity phase grating," Proc. SPIE 1789, 13-17 (1992).
    [CrossRef]
  3. T. Y. Fan, "Laser beam combining for power and brightness scaling," IEEE Aerospace Conf. Proc. 3, 49-54 (2000).
  4. J. Hou, R. Xiao, Z. F. Jiang, X. A. Cheng, B. H. Shu, J. B. Chen, and Z. J. Liu, "Coherent beam combination of two polarization maintaining ytterbium fibre amplifiers," Chin. Phys. Lett. 22, 2273-2275 (2005).
    [CrossRef]
  5. R. Xiao, J. Hou, and Z. F. Jiang, "Experimental investigation of phase detection and compensation in coherent combining of fiber laser array," Acta Phys. Sin. 55, 184-187 (2006).
  6. M. K. Davis, M. J. F. Digonnet, and R. H. Pantell, "Thermal Effects in Doped Fibers," J. of Lightwave Technol. 16, 1013-1023 (1998).
    [CrossRef]

2006

R. Xiao, J. Hou, and Z. F. Jiang, "Experimental investigation of phase detection and compensation in coherent combining of fiber laser array," Acta Phys. Sin. 55, 184-187 (2006).

2005

J. Hou, R. Xiao, Z. F. Jiang, X. A. Cheng, B. H. Shu, J. B. Chen, and Z. J. Liu, "Coherent beam combination of two polarization maintaining ytterbium fibre amplifiers," Chin. Phys. Lett. 22, 2273-2275 (2005).
[CrossRef]

2004

1998

M. K. Davis, M. J. F. Digonnet, and R. H. Pantell, "Thermal Effects in Doped Fibers," J. of Lightwave Technol. 16, 1013-1023 (1998).
[CrossRef]

1992

J. Morel, "Coherent coupling of an array of Nd3+ doped single-mode fiber lasers using an intracavity phase grating," Proc. SPIE 1789, 13-17 (1992).
[CrossRef]

Acta Phys. Sin.

R. Xiao, J. Hou, and Z. F. Jiang, "Experimental investigation of phase detection and compensation in coherent combining of fiber laser array," Acta Phys. Sin. 55, 184-187 (2006).

Chin. Phys. Lett.

J. Hou, R. Xiao, Z. F. Jiang, X. A. Cheng, B. H. Shu, J. B. Chen, and Z. J. Liu, "Coherent beam combination of two polarization maintaining ytterbium fibre amplifiers," Chin. Phys. Lett. 22, 2273-2275 (2005).
[CrossRef]

J. of Lightwave Technol.

M. K. Davis, M. J. F. Digonnet, and R. H. Pantell, "Thermal Effects in Doped Fibers," J. of Lightwave Technol. 16, 1013-1023 (1998).
[CrossRef]

Opt. Lett.

Proc. SPIE

J. Morel, "Coherent coupling of an array of Nd3+ doped single-mode fiber lasers using an intracavity phase grating," Proc. SPIE 1789, 13-17 (1992).
[CrossRef]

Other

T. Y. Fan, "Laser beam combining for power and brightness scaling," IEEE Aerospace Conf. Proc. 3, 49-54 (2000).

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Figures (9)

Fig. 1.
Fig. 1.

The basic principle of MOPA.

Fig. 2.
Fig. 2.

40MHz heterodyne signals.

Fig. 3.
Fig. 3.

The amplifier phase noises and its compensation signals.

Fig. 4.
Fig. 4.

The amplifier Phase noise spectral density for steady-state amplifier operation.

Fig. 5.
Fig. 5.

The fill factor=12.5%, the far field of coherent combined two element MOPA array.

Fig. 6.
Fig. 6.

The fill factor=10%, the far field of coherent combined two element MOPA array.

Fig. 7.
Fig. 7.

The fill factor=8.33%, the far field of coherent combined two element MOPA array.

Fig. 8.
Fig. 8.

The far field of coherent combined three element MOPA array.

Fig. 9.
Fig. 9.

The far field contrast of coherent combined two and three element MOPA array.

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