Abstract

We demonstrate passive combination of multiple beams in an optical fiber via stimulated Brillouin scattering (SBS). Four off-axis beams are combined in a long multimode optical fiber using a novel all-optical mount. The combined beam has the high spatial coherence properties of the LP01 mode owing to the beam cleanup properties of SBS. The threshold for SBS when off-axis pumps are used is shown to be a factor of 13 times higher than for on-axis pump beams. We propose this method would improve the brightness of an array of fiber amplifiers.

© 2007 Optical Society of America

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References

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  1. T. H. Russell and W. B. Roh, Opt. Express 8, 4 (2001).
    [CrossRef]
  2. B. C. Rogers, T. H. Russell, and W. B. Roh, Opt. Lett. 24, 1124 (1999).
    [CrossRef]
  3. B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).
  4. L. Lombard, A. Brignon, J.-P. Huignard, E. Lallier, and P. Georges, Opt. Lett. 31, 158 (2006).
    [CrossRef] [PubMed]
  5. H. Bruesselbach, in Conference on Lasers and Electro-Optics (CLEO), Vol. 11 of 1993 OSA Technical Digest Series (Optical Society of America, 1993), pp. 424-426.
  6. T. H. Russell, 'Laser intensity scaling through stimulated scattering in optical fibers,' Ph. D. dissertation (Air Force Institute of Technology, 2001).
  7. G. P. Agrawal, Nonlinear Fiber Optics (Academic, 2001).

2006 (1)

2004 (1)

B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).

2001 (1)

T. H. Russell and W. B. Roh, Opt. Express 8, 4 (2001).
[CrossRef]

1999 (1)

Agrawal, G. P.

G. P. Agrawal, Nonlinear Fiber Optics (Academic, 2001).

Brignon, A.

Bruesselbach, H.

H. Bruesselbach, in Conference on Lasers and Electro-Optics (CLEO), Vol. 11 of 1993 OSA Technical Digest Series (Optical Society of America, 1993), pp. 424-426.

Georges, P.

Grime, B. W.

B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).

Huignard, J.-P.

Lallier, E.

Lombard, L.

Rogers, B. C.

Roh, W. B.

B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).

T. H. Russell and W. B. Roh, Opt. Express 8, 4 (2001).
[CrossRef]

B. C. Rogers, T. H. Russell, and W. B. Roh, Opt. Lett. 24, 1124 (1999).
[CrossRef]

Russell, T. H.

B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).

T. H. Russell and W. B. Roh, Opt. Express 8, 4 (2001).
[CrossRef]

B. C. Rogers, T. H. Russell, and W. B. Roh, Opt. Lett. 24, 1124 (1999).
[CrossRef]

T. H. Russell, 'Laser intensity scaling through stimulated scattering in optical fibers,' Ph. D. dissertation (Air Force Institute of Technology, 2001).

Terry, N. B.

B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).

Opt. Express (1)

T. H. Russell and W. B. Roh, Opt. Express 8, 4 (2001).
[CrossRef]

Opt. Lett. (2)

SSDLTR Tech. Digest (1)

B. W. Grime, N. B. Terry, T. H. Russell, and W. B. Roh, SSDLTR Tech. Digest 17 (2004).

Other (3)

H. Bruesselbach, in Conference on Lasers and Electro-Optics (CLEO), Vol. 11 of 1993 OSA Technical Digest Series (Optical Society of America, 1993), pp. 424-426.

T. H. Russell, 'Laser intensity scaling through stimulated scattering in optical fibers,' Ph. D. dissertation (Air Force Institute of Technology, 2001).

G. P. Agrawal, Nonlinear Fiber Optics (Academic, 2001).

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Figures (4)

Fig. 1
Fig. 1

Experiment schematic. Abbreviations defined in text.

Fig. 2
Fig. 2

Diagram of the GGM. Six fiber pigtail collimators terminated with GRIN lenses surround a central hole that serves as the return path for the Stokes beam. In this experiment only four of the six pigtails were used.

Fig. 3
Fig. 3

Reflected and transmitted power as a function of power measured directly after the GGM. Slope efficiency is 24%. When measured relative to the energy coupled into the fiber, the slope efficiency increases to 38%.

Fig. 4
Fig. 4

Contour plots of the beam profile for both Stokes and input beams: (a) near-field pump, (b) far-field pump, (c) near-field Stokes, and (d) far-field Stokes.

Equations (3)

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d I s d z = g B I p I s + α I s ,
d P s d z = g B γ P p P s + α P s ,
γ = I p I s d r P p P s ,

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