Two high pulse contrast (> 95 dB) polarization maintaining all-fiber amplifier chains were coherently combined to generate 0.42 mJ, 1 ns 25 kHz pulses with 79% efficiency despite 38 radians of intra-pulse phase distortion. A recursive intra-pulse phase compensation method was utilized to correct for the large nonlinear chirp providing a path for improved coherent waveform control of nanosecond pulse trains.

© 2012 OSA

1. F. Di Teodoro, High-Power Laser Handbook (McGraw-Hill, 2011), pp. 463–498.
2. L. Lombard, A. Azarian, K. Cadoret, P. Bourdon, D. Goular, G. Canat, V. Jolivet, Y. Jaouën, and O. Vasseur, “Coherent beam combination of narrow-linewidth 1.5 μm fiber amplifiers in a long-pulse regime,” Opt. Lett.36(4), 523–525 (2011). [CrossRef] [PubMed]
3. L. Daniault, M. Hanna, L. Lombard, Y. Zaouter, E. Mottay, D. Goular, P. Bourdon, F. Druon, and P. Georges, “Coherent beam combining of two femtosecond fiber chirped-pulse amplifiers,” Opt. Lett.36(5), 621–623 (2011). [CrossRef] [PubMed]
4. X. L. Wang, P. Zhou, Y. X. Ma, H. T. Ma, X. J. Xu, Z. J. Liu, and Y. J. Zhao, “Coherent beam combining of pulsed fiber lasers with hybrid phase control,” Laser Phys.20(6), 1453–1458 (2010). [CrossRef]
5. E. Seise, A. Klenke, S. Breitkopf, M. Plötner, J. Limpert, and A. Tünnermann, “Coherently combined fiber laser system delivering 120 μJ femtosecond pulses,” Opt. Lett.36(4), 439–441 (2011). [CrossRef] [PubMed]
6. E. C. Cheung, M. Weber, and R. R. Rice, “Phase locking of a pulsed fiber amplifier,” in Advanced Solid-State Photonics, 2008 OSA Technical Digest Series (Optical Society of America, 2008), paper WA2.
7. C. Xu, L. Mollenauer, and X. Liu, “Compensation of nonlinear self-phase modulation with phase modulators,” Electron. Lett.38(24), 1578–1579 (2002). [CrossRef]
8. J. van Howe, G. Zhu, and C. Xu, “Compensation of self-phase modulation in fiber-based chirped-pulse amplification systems,” Opt. Lett.31(11), 1756–1758 (2006). [CrossRef] [PubMed]
9. G. Zhu, J. Edinberg, and C. Xu, “Nonlinear distortion free fiber-based chirped pulse amplification with self-phase modulation up to 2pi,” Opt. Express15(5), 2530–2534 (2007). [CrossRef] [PubMed]
10. G. D. Goodno, C. C. Shih, and J. E. Rothenberg, “Perturbative analysis of coherent combining efficiency with mismatched lasers,” Opt. Express18(24), 25403–25414 (2010). [CrossRef] [PubMed]
11. T. M. Shay, “Theory of electronically phased coherent beam combination without a reference beam,” Opt. Express14(25), 12188–12195 (2006). [CrossRef] [PubMed]
12. A. Flores, T. M. Shay, C. A. Lu, C. Robin, B. Pulford, A. D. Sanchez, D. W. Hult, and K. B. Rowland, “Coherent beam combining of fiber amplifiers in a kW regime,” in CLEO:2011- Laser Applications to Photonic Applications, 2011 OSA Technical Digest Series (Optical Society of America, 2011), paper CFE3.
13. T. M. Shay, “Self-reference locking of optical coherence by single-detector electronic-frequency tagging,” US Air Force, US Patent 7,233,433 (2007).
14. L. Lago, D. Bigourd, A. Mussot, M. Douay, and E. Hugonnot, “High-energy temporally shaped nanosecond-pulse master-oscillator power amplifier based on ytterbium-doped single-mode microstructured flexible fiber,” Opt. Lett.36(5), 734–736 (2011). [CrossRef] [PubMed]
15. C. X. Yu, S. J. Augst, S. M. Redmond, K. C. Goldizen, D. V. Murphy, A. Sanchez, and T. Y. Fan, “Coherent combining of a 4 kW, eight-element fiber amplifier array,” Opt. Lett.36(14), 2686–2688 (2011). [CrossRef] [PubMed]
16. A. Vorontsov and V. P. Sivokon, “Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction,” J. Opt. Soc. Am. A15(10), 2745–2758 (1998). [CrossRef]
17. W. F. Buell, N. J. Marechal, R. P. Dickinson, D. Kozlowski, T. J. Wright, J. R. Buck, and S. M. Beck, “Synthetic aperture imaging ladar: lab demo and signal processing,” Proceedings of the 2003 Military Sensing Symposia: Active EO Systems (2003).
18. A. Weiner, “Femtosecond pulse shaping using spatial light modulators,” Rev. Sci. Instrum.71(5), 1929–1960 (2000). [CrossRef]

Electron. Lett.

• C. Xu, L. Mollenauer, and X. Liu, “Compensation of nonlinear self-phase modulation with phase modulators,” Electron. Lett.38(24), 1578–1579 (2002). [CrossRef]

J. Opt. Soc. Am. A

• A. Vorontsov and V. P. Sivokon, “Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction,” J. Opt. Soc. Am. A15(10), 2745–2758 (1998). [CrossRef]

Laser Phys.

• X. L. Wang, P. Zhou, Y. X. Ma, H. T. Ma, X. J. Xu, Z. J. Liu, and Y. J. Zhao, “Coherent beam combining of pulsed fiber lasers with hybrid phase control,” Laser Phys.20(6), 1453–1458 (2010). [CrossRef]

Opt. Express

• G. Zhu, J. Edinberg, and C. Xu, “Nonlinear distortion free fiber-based chirped pulse amplification with self-phase modulation up to 2pi,” Opt. Express15(5), 2530–2534 (2007). [CrossRef] [PubMed]
• G. D. Goodno, C. C. Shih, and J. E. Rothenberg, “Perturbative analysis of coherent combining efficiency with mismatched lasers,” Opt. Express18(24), 25403–25414 (2010). [CrossRef] [PubMed]
• T. M. Shay, “Theory of electronically phased coherent beam combination without a reference beam,” Opt. Express14(25), 12188–12195 (2006). [CrossRef] [PubMed]

Opt. Lett.

• E. Seise, A. Klenke, S. Breitkopf, M. Plötner, J. Limpert, and A. Tünnermann, “Coherently combined fiber laser system delivering 120 μJ femtosecond pulses,” Opt. Lett.36(4), 439–441 (2011). [CrossRef] [PubMed]
• L. Lombard, A. Azarian, K. Cadoret, P. Bourdon, D. Goular, G. Canat, V. Jolivet, Y. Jaouën, and O. Vasseur, “Coherent beam combination of narrow-linewidth 1.5 μm fiber amplifiers in a long-pulse regime,” Opt. Lett.36(4), 523–525 (2011). [CrossRef] [PubMed]
• L. Daniault, M. Hanna, L. Lombard, Y. Zaouter, E. Mottay, D. Goular, P. Bourdon, F. Druon, and P. Georges, “Coherent beam combining of two femtosecond fiber chirped-pulse amplifiers,” Opt. Lett.36(5), 621–623 (2011). [CrossRef] [PubMed]
• J. van Howe, G. Zhu, and C. Xu, “Compensation of self-phase modulation in fiber-based chirped-pulse amplification systems,” Opt. Lett.31(11), 1756–1758 (2006). [CrossRef] [PubMed]
• L. Lago, D. Bigourd, A. Mussot, M. Douay, and E. Hugonnot, “High-energy temporally shaped nanosecond-pulse master-oscillator power amplifier based on ytterbium-doped single-mode microstructured flexible fiber,” Opt. Lett.36(5), 734–736 (2011). [CrossRef] [PubMed]
• C. X. Yu, S. J. Augst, S. M. Redmond, K. C. Goldizen, D. V. Murphy, A. Sanchez, and T. Y. Fan, “Coherent combining of a 4 kW, eight-element fiber amplifier array,” Opt. Lett.36(14), 2686–2688 (2011). [CrossRef] [PubMed]

Rev. Sci. Instrum.

• A. Weiner, “Femtosecond pulse shaping using spatial light modulators,” Rev. Sci. Instrum.71(5), 1929–1960 (2000). [CrossRef]

Other

• F. Di Teodoro, High-Power Laser Handbook (McGraw-Hill, 2011), pp. 463–498.
• W. F. Buell, N. J. Marechal, R. P. Dickinson, D. Kozlowski, T. J. Wright, J. R. Buck, and S. M. Beck, “Synthetic aperture imaging ladar: lab demo and signal processing,” Proceedings of the 2003 Military Sensing Symposia: Active EO Systems (2003).
• E. C. Cheung, M. Weber, and R. R. Rice, “Phase locking of a pulsed fiber amplifier,” in Advanced Solid-State Photonics, 2008 OSA Technical Digest Series (Optical Society of America, 2008), paper WA2.
• A. Flores, T. M. Shay, C. A. Lu, C. Robin, B. Pulford, A. D. Sanchez, D. W. Hult, and K. B. Rowland, “Coherent beam combining of fiber amplifiers in a kW regime,” in CLEO:2011- Laser Applications to Photonic Applications, 2011 OSA Technical Digest Series (Optical Society of America, 2011), paper CFE3.
• T. M. Shay, “Self-reference locking of optical coherence by single-detector electronic-frequency tagging,” US Air Force, US Patent 7,233,433 (2007).

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