Amplitude and phase control of the output beam of a multimode LMA fiber supporting 4 modes is demonstrated by digital holography in both continuous and ns pulsed regimes at 1064 nm. Our system allows dynamic compensation of beam pointing instabilities, external perturbations introducing low order aberrations and fluctuations of the relative phase of the modes supported by the fiber.

© 2009 OSA

1. C. X. Yu, J. E. Kansky, S. E. J. Shaw, D. V. Murphy, and C. Higgs, “Coherent beam combining of large number of PM fibres in 2-D fibre array,” Electron. Lett. 42(18), 1024–1025 (2006). [CrossRef]
2. J. Anderegg, S. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and A. M. Wickham, “Coherently Coupled High Power Fiber Arrays,” Proc. SPIE, 6102, (2006).
3. E. C. Cheung, M. Weber, and R. R. Rice, “Phase Locking of a Pulsed Fiber Amplifier,” in Advanced Solid-State Photonics, Technical Digest (Optical Society of America, 2008), paper WA2.
4. L. Lombard, A. Brignon, J. P. Huignard, E. Lallier, and P. Georges, “Beam cleanup in a self-aligned gradient-index Brillouin cavity for high-power multimode fiber amplifiers,” Opt. Lett. 31(2), 158–160 (2006). [CrossRef] [PubMed]
5. B. Steinhausser, A. Brignon, E. Lallier, J. P. Huignard, and P. Georges, “High energy, single-mode, narrow-linewidth fiber laser source using stimulated Brillouin scattering beam cleanup,” Opt. Express 15(10), 6464–6469 (2007). [CrossRef] [PubMed]
6. C. Bellanger, A. Brignon, J. Colineau, and J. P. Huignard, “Coherent fiber combining by digital holography,” Opt. Lett. 33(24), 2937–2939 (2008). [CrossRef] [PubMed]
7. A. Brignon, L. Loiseau, C. Lara, J. P. Huignard, and J. P. Pocholle, “Phase conjugation in a continuous-wave diode-pumped Nd:YVO4 laser,” Appl. Phys. B 69(2), 159–162 (1999). [CrossRef]
8. W. Joseph, Goodman, Introduction to Fourier Optics (Roberts & Company Publishers, Englewood, 2005), Chap. 9.
9. A. Sennaroglu and J. G. Fujimoto, “Design criteria for Herriott-type multi-pass cavities for ultrashort pulse lasers,” Opt. Express 11(9), 1106–1113 (2003). [CrossRef] [PubMed]
10. I. Hartl, A. Marcinkevicius, H. A. McKay, L. Dong, and M. E. Fermann, “Coherent beam combination using multi-core leakage-channel fibers,” in Advanced Solid-State Photonics, Technical Digest (Optical Society of America, 2009), paper TuA6.

Appl. Phys. B

• A. Brignon, L. Loiseau, C. Lara, J. P. Huignard, and J. P. Pocholle, “Phase conjugation in a continuous-wave diode-pumped Nd:YVO4 laser,” Appl. Phys. B 69(2), 159–162 (1999). [CrossRef]

Electron. Lett.

• C. X. Yu, J. E. Kansky, S. E. J. Shaw, D. V. Murphy, and C. Higgs, “Coherent beam combining of large number of PM fibres in 2-D fibre array,” Electron. Lett. 42(18), 1024–1025 (2006). [CrossRef]

Opt. Express

• B. Steinhausser, A. Brignon, E. Lallier, J. P. Huignard, and P. Georges, “High energy, single-mode, narrow-linewidth fiber laser source using stimulated Brillouin scattering beam cleanup,” Opt. Express 15(10), 6464–6469 (2007). [CrossRef] [PubMed]
• A. Sennaroglu and J. G. Fujimoto, “Design criteria for Herriott-type multi-pass cavities for ultrashort pulse lasers,” Opt. Express 11(9), 1106–1113 (2003). [CrossRef] [PubMed]

Opt. Lett.

• C. Bellanger, A. Brignon, J. Colineau, and J. P. Huignard, “Coherent fiber combining by digital holography,” Opt. Lett. 33(24), 2937–2939 (2008). [CrossRef] [PubMed]
• L. Lombard, A. Brignon, J. P. Huignard, E. Lallier, and P. Georges, “Beam cleanup in a self-aligned gradient-index Brillouin cavity for high-power multimode fiber amplifiers,” Opt. Lett. 31(2), 158–160 (2006). [CrossRef] [PubMed]

Other

• J. Anderegg, S. Brosnan, E. Cheung, P. Epp, D. Hammons, H. Komine, M. Weber, and A. M. Wickham, “Coherently Coupled High Power Fiber Arrays,” Proc. SPIE, 6102, (2006).
• E. C. Cheung, M. Weber, and R. R. Rice, “Phase Locking of a Pulsed Fiber Amplifier,” in Advanced Solid-State Photonics, Technical Digest (Optical Society of America, 2008), paper WA2.
• I. Hartl, A. Marcinkevicius, H. A. McKay, L. Dong, and M. E. Fermann, “Coherent beam combination using multi-core leakage-channel fibers,” in Advanced Solid-State Photonics, Technical Digest (Optical Society of America, 2009), paper TuA6.
• W. Joseph, Goodman, Introduction to Fourier Optics (Roberts & Company Publishers, Englewood, 2005), Chap. 9.

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