Abstract

Spectral beam combining is a power scaling concept for fiber lasers, where several individual laser beams with different wavelengths are overlapped utilizing a dispersive element. We present a combination of three master-oscillator power-amplifier fiber laser systems to a total power of 153W. Due to the employment of single-polarization low-nonlinearity photonic crystal fibers in the main amplification stages a combining efficiency as high as 95% has been realized. The measured beam quality of M2=1.2 for each laser does not decrease for the combined beam. Thus this setup provides excellent opportunities for brightness enhancement. Additional considerations for further increase in power are made.

© 2007 Optical Society of America

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  1. G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. (Academic, 1995).
  2. J. Limpert, A. Liem, M. Reich, T. Schreiber, S. Nolte, H. Zellmer, A. Tünnermann, J. Broeng, A. Petersson, and C. Jakobsen, "Low-nonlinearity single-transverse-mode ytterbium-doped photonic crystal fiber amplifier," Opt. Express 12, 1313-1319 (2004).
    [CrossRef] [PubMed]
  3. V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).
  4. M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).
  5. J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).
  6. L. Michaille, C. R. Bennett, D. M. Taylor, T. J. Shepherd, J. Broeng, H. R. Simonsen, and A. Petersson, "Phase locking and supermode selection in multicore photonic crystal fiber lasers with large doped area," Opt. Lett. 30, 1668-1670 (2005).
    [CrossRef] [PubMed]
  7. H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.
  8. T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).
  9. F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).
  10. S. J. Augst, A. K. Goyal, R. L. Aggarwal, T. Y. Fan, and A. Sanchez, "Wavelength beam combining of ytterbium fiber lasers," Opt. Lett. 28, 331-333 (2003).
    [CrossRef] [PubMed]
  11. E. J. Bochove, "Theory of spectral beam combining of fiber lasers," IEEE J. Quantum Electron. 38, 432-445 (2002).
    [CrossRef]
  12. T. Schreiber, F. Röser, O. Schmidt, J. Limpert, R. Iliew, F. Lederer, A. Petersson, C. Jacobsen, K. P. Hansen, J. Broeng, and A. Tünnermann, "Stress-induced single-polarization single-transverse mode photonic crystal fiber with low nonlinearity," Opt. Express 13, 7621-7630 (2005).
    [CrossRef] [PubMed]
  13. T. Clausnitzer, J. Limpert, K. Zöllner, H. Zellmer, H.-J. Fuchs, E.-B. Kley, A. Tünnermann, M. Jup, and D. Ristau, "Highly efficient transmission gratings in fused silica for CPA systems," Appl. Opt. 42, 6934-6938 (2003).
    [CrossRef] [PubMed]

2005 (2)

2004 (1)

2003 (2)

2002 (1)

E. J. Bochove, "Theory of spectral beam combining of fiber lasers," IEEE J. Quantum Electron. 38, 432-445 (2002).
[CrossRef]

Abramov, M.

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).

Aggarwal, R. L.

Agrawal, G. P.

G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. (Academic, 1995).

Anderegg, J.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Augst, S. J.

Bennett, C. R.

Bochove, E. J.

E. J. Bochove, "Theory of spectral beam combining of fiber lasers," IEEE J. Quantum Electron. 38, 432-445 (2002).
[CrossRef]

Broeng, J.

Brosnan, S. J.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Bruesselbach, H.

H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.

Bruesselbach, H. W.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Cheung, E.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Clausnitzer, T.

Dunning, G. J.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Eberhard, R.

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Epp, P.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Fan, T. Y.

Ferin, A.

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).

Fomin, V.

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).

Fuchs, H.-J.

Gapontsev, V.

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).

Goyal, A. K.

Hamilton, C. E.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Hammon, D. L.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Hammons, D.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Hansen, K. P.

Höfer, S.

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Hoffman, P. R.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Honea, E.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Iliew, R.

Jacobsen, C.

Jakobsen, C.

Jones, D. C.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.

Jup, M.

Kley, E.-B.

Klingebiel, S.

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Komine, H.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Lederer, F.

Liem, A.

J. Limpert, A. Liem, M. Reich, T. Schreiber, S. Nolte, H. Zellmer, A. Tünnermann, J. Broeng, A. Petersson, and C. Jakobsen, "Low-nonlinearity single-transverse-mode ytterbium-doped photonic crystal fiber amplifier," Opt. Express 12, 1313-1319 (2004).
[CrossRef] [PubMed]

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Limpert, J.

Liu, A.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Loftus, T. H.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Magir, M. S.

H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.

Mangir, M. S.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Mashkin, A.

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).

Michaille, L.

Minden, M.

H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.

Minden, M. L.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Nolte, S.

Norsen, M.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Peschel, T.

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Petersson, A.

Reich, M.

Ristau, D.

Rogers, J. L.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.

Röser, F.

T. Schreiber, F. Röser, O. Schmidt, J. Limpert, R. Iliew, F. Lederer, A. Petersson, C. Jacobsen, K. P. Hansen, J. Broeng, and A. Tünnermann, "Stress-induced single-polarization single-transverse mode photonic crystal fiber with low nonlinearity," Opt. Express 13, 7621-7630 (2005).
[CrossRef] [PubMed]

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Sanchez, A.

Schmidt, O.

Schreiber, T.

Shepherd, T. J.

Simonsen, H. R.

Solis, A. J.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Taylor, D. M.

Thomas, A.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

Tünnermann, A.

Vaughan, L.

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

Weber, M.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Wickham, M. G.

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

Zellmer, H.

Zöllner, K.

Appl. Opt. (1)

IEEE J. Quantum Electron. (1)

E. J. Bochove, "Theory of spectral beam combining of fiber lasers," IEEE J. Quantum Electron. 38, 432-445 (2002).
[CrossRef]

Opt. Express (2)

Opt. Lett. (2)

Other (7)

G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. (Academic, 1995).

H. Bruesselbach, M. Minden, J. L. Rogers, D. C. Jones, and M. S. Magir, "200 W Self-Organized Coherent Fiber Arrays," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Sciences (CLEO/QELS) (Optical Society of America, 2006.

T. H. Loftus, A. Liu, P. R. Hoffman, A. Thomas, M. Norsen, C. E. Hamilton, and E. Honea, "258 W of spectrally beam combined power with near-diffraction limited beam quality," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhard, and A. Tünnermann, "Spectral combining of fiber lasers," in Fiber Lasers III, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 6102OS (2006).

V. Fomin, A. Mashkin, M. Abramov, A. Ferin, V. Gapontsev, and IPG Laser GmbH Burbach Germany, "3 kW Yb fibre lasers with a single-mode output," in International Symposium on High-Power Fiber Lasers and their Applications (Laser Research Institute, 2006).

M. L. Minden, H. W. Bruesselbach, J. L. Rogers, M. S. Mangir, D. C. Jones, G. J. Dunning, D. L. Hammon, A. J. Solis, and L. Vaughan, "Self-organized coherence in fiber laser arrays," in Fiber Lasers, L.N.Durvasula, ed., Proc. SPIE 5335, 89-97 (2004).

J. Anderegg, S. J. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and M. G. Wickham, "Coherently coupled high-power fiber arrays," in Fiber Lasers III: Technology, Systems, and Applications, A.J.Brown, J.Nilsson, D.J.Harter, and A.Tünnermann, eds., Proc. SPIE 6102, 61020U (2006).

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Figures (8)

Fig. 1
Fig. 1

Laser setup for SBC. The fibers are arranged in a linear array. Each fiber emits a different wavelength and all beams are superposed after the outcoupling mirror.

Fig. 2
Fig. 2

One of three identical MOPA fiber laser setups for SBC. This setup consists of the oscillator and two amplification stages.

Fig. 3
Fig. 3

Detailed setup for the oscillator.

Fig. 4
Fig. 4

Cross section of a single-polarization fiber with a 40 μ m core diameter.

Fig. 5
Fig. 5

Output characteristics of one individual fiber amplifier.

Fig. 6
Fig. 6

Spectrum of one single MOPA system.

Fig. 7
Fig. 7

Spectral combining with separately collimated beams. The incident angles on the grating can be chosen with the mirrors.

Fig. 8
Fig. 8

Spectrum of the combined beams.

Tables (1)

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Table 1 Beam Quality for Three Combined Beams and Different Powers

Equations (1)

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Δ θ = f Δ λ cos θ l ,

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