Abstract

We report on the passive coherent combining of up to 8 temporally and spatially separated ultrashort pulses amplified in a stretcher-free ytterbium-doped fiber system. An initial femtosecond pulse is split into 4 temporal replicas using divided-pulse amplification, and subsequently divided in two counter-propagating beams in a Sagnac interferometer containing a fiber amplifier. The spatio-temporal distribution of the peak-power inside the amplifier allows the generation of record 3.1 µJ and 50 fs pulses at 1 MHz of repetition rate with 52 MW of peak-power from a stretcher-free fiber amplifier and without additional nonlinear post-compression stages.

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  1. T. Eidam, S. Hanf, E. Seise, T. V. Andersen, T. Gabler, C. Wirth, T. Schreiber, J. Limpert, and A. Tünnermann, “Femtosecond fiber CPA system emitting 830 W average output power,” Opt. Lett.35(2), 94–96 (2010).
    [CrossRef] [PubMed]
  2. F. Röser, T. Eidam, J. Rothhardt, O. Schmidt, D. N. Schimpf, J. Limpert, and A. Tünnermann, “Millijoule pulse energy high repetition rate femtosecond fiber chirped-pulse amplification system,” Opt. Lett.32(24), 3495–3497 (2007).
    [CrossRef] [PubMed]
  3. F. Stutzki, F. Jansen, T. Eidam, A. Steinmetz, C. Jauregui, J. Limpert, and A. Tünnermann, “High average power large-pitch fiber amplifier with robust single-mode operation,” Opt. Lett.36(5), 689–691 (2011).
    [CrossRef] [PubMed]
  4. E. Seise, A. Klenke, J. Limpert, and A. Tünnermann, “Coherent addition of fiber-amplified ultrashort laser pulses,” Opt. Express18(26), 27827–27835 (2010).
    [CrossRef] [PubMed]
  5. 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]
  6. A. Klenke, E. Seise, S. Demmler, J. Rothhardt, S. Breitkopf, J. Limpert, and A. Tünnermann, “Coherently-combined two channel femtosecond fiber CPA system producing 3 mJ pulse energy,” Opt. Express19(24), 24280–24285 (2011).
    [CrossRef] [PubMed]
  7. L. Daniault, M. Hanna, D. N. Papadopoulos, Y. Zaouter, E. Mottay, F. Druon, and P. Georges, “Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers,” Opt. Lett.36(20), 4023–4025 (2011).
    [CrossRef] [PubMed]
  8. Y. Zaouter, L. Daniault, M. Hanna, D. N. Papadopoulos, F. Morin, C. Hönninger, F. Druon, E. Mottay, and P. Georges, “Passive coherent combination of two ultrafast rod type fiber chirped pulse amplifiers,” Opt. Lett.37(9), 1460–1462 (2012).
    [CrossRef] [PubMed]
  9. S. Zhou, F. W. Wise, and D. G. Ouzounov, “Divided-pulse amplification of ultrashort pulses,” Opt. Lett.32(7), 871–873 (2007).
    [CrossRef] [PubMed]
  10. L. J. Kong, L. M. Zhao, S. Lefrancois, D. G. Ouzounov, C. X. Yang, and F. W. Wise, “Generation of megawatt peak power picosecond pulses from a divided-pulse fiber amplifier,” Opt. Lett.37(2), 253–255 (2012).
    [CrossRef] [PubMed]
  11. M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
    [CrossRef] [PubMed]
  12. D. N. Papadopoulos, Y. Zaouter, M. Hanna, F. Druon, E. Mottay, E. Cormier, and P. Georges, “Generation of 63 fs 4.1 MW peak power pulses from a parabolic fiber amplifier operated beyond the gain bandwidth limit,” Opt. Lett.32(17), 2520–2522 (2007).
    [CrossRef] [PubMed]
  13. Y. Zaouter, D. N. Papadopoulos, M. Hanna, J. Boullet, L. Huang, C. Aguergaray, F. Druon, E. Mottay, P. Georges, and E. Cormier, “Stretcher-free high energy nonlinear amplification of femtosecond pulses in rod-type fibers,” Opt. Lett.33(2), 107–109 (2008).
    [CrossRef] [PubMed]

2012 (2)

2011 (4)

2010 (2)

2008 (1)

2007 (3)

2000 (1)

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

Aguergaray, C.

Andersen, T. V.

Boullet, J.

Bourdon, P.

Breitkopf, S.

Cormier, E.

Daniault, L.

Demmler, S.

Druon, F.

Dudley, J. M.

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

Eidam, T.

Fermann, M. E.

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

Gabler, T.

Georges, P.

Goular, D.

Hanf, S.

Hanna, M.

Harvey, J. D.

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

Hönninger, C.

Huang, L.

Jansen, F.

Jauregui, C.

Klenke, A.

Kong, L. J.

Kruglov, V. I.

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

Lefrancois, S.

Limpert, J.

Lombard, L.

Morin, F.

Mottay, E.

Ouzounov, D. G.

Papadopoulos, D. N.

Röser, F.

Rothhardt, J.

Schimpf, D. N.

Schmidt, O.

Schreiber, T.

Seise, E.

Steinmetz, A.

Stutzki, F.

Thomsen, B. C.

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

Tünnermann, A.

Wirth, C.

Wise, F. W.

Yang, C. X.

Zaouter, Y.

Zhao, L. M.

Zhou, S.

Opt. Express (2)

Opt. Lett. (10)

L. Daniault, M. Hanna, D. N. Papadopoulos, Y. Zaouter, E. Mottay, F. Druon, and P. Georges, “Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers,” Opt. Lett.36(20), 4023–4025 (2011).
[CrossRef] [PubMed]

Y. Zaouter, L. Daniault, M. Hanna, D. N. Papadopoulos, F. Morin, C. Hönninger, F. Druon, E. Mottay, and P. Georges, “Passive coherent combination of two ultrafast rod type fiber chirped pulse amplifiers,” Opt. Lett.37(9), 1460–1462 (2012).
[CrossRef] [PubMed]

S. Zhou, F. W. Wise, and D. G. Ouzounov, “Divided-pulse amplification of ultrashort pulses,” Opt. Lett.32(7), 871–873 (2007).
[CrossRef] [PubMed]

L. J. Kong, L. M. Zhao, S. Lefrancois, D. G. Ouzounov, C. X. Yang, and F. W. Wise, “Generation of megawatt peak power picosecond pulses from a divided-pulse fiber amplifier,” Opt. Lett.37(2), 253–255 (2012).
[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]

T. Eidam, S. Hanf, E. Seise, T. V. Andersen, T. Gabler, C. Wirth, T. Schreiber, J. Limpert, and A. Tünnermann, “Femtosecond fiber CPA system emitting 830 W average output power,” Opt. Lett.35(2), 94–96 (2010).
[CrossRef] [PubMed]

F. Röser, T. Eidam, J. Rothhardt, O. Schmidt, D. N. Schimpf, J. Limpert, and A. Tünnermann, “Millijoule pulse energy high repetition rate femtosecond fiber chirped-pulse amplification system,” Opt. Lett.32(24), 3495–3497 (2007).
[CrossRef] [PubMed]

F. Stutzki, F. Jansen, T. Eidam, A. Steinmetz, C. Jauregui, J. Limpert, and A. Tünnermann, “High average power large-pitch fiber amplifier with robust single-mode operation,” Opt. Lett.36(5), 689–691 (2011).
[CrossRef] [PubMed]

D. N. Papadopoulos, Y. Zaouter, M. Hanna, F. Druon, E. Mottay, E. Cormier, and P. Georges, “Generation of 63 fs 4.1 MW peak power pulses from a parabolic fiber amplifier operated beyond the gain bandwidth limit,” Opt. Lett.32(17), 2520–2522 (2007).
[CrossRef] [PubMed]

Y. Zaouter, D. N. Papadopoulos, M. Hanna, J. Boullet, L. Huang, C. Aguergaray, F. Druon, E. Mottay, P. Georges, and E. Cormier, “Stretcher-free high energy nonlinear amplification of femtosecond pulses in rod-type fibers,” Opt. Lett.33(2), 107–109 (2008).
[CrossRef] [PubMed]

Phys. Rev. Lett. (1)

M. E. Fermann, V. I. Kruglov, B. C. Thomsen, J. M. Dudley, and J. D. Harvey, “Self-similar propagation and amplification of parabolic pulses in optical fibers,” Phys. Rev. Lett.84(26), 6010–6013 (2000).
[CrossRef] [PubMed]

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Figures (6)

Fig. 1
Fig. 1

Schematic representation of the spatial and temporal coherent combining techniques. Top: Sagnac geometry for spatial division. Bottom: DPA geometry for temporal division. PBS: Polarizing beam splitter; FR: Faraday rotator; BCs: birefringent crystals. The green arrows represent the direction of propagation while red arrows stand for the polarization states.

Fig. 2
Fig. 2

Top: Evolution of the polarization state in the system if a quarter-wave plate is not inserted. Bottom: Schematic representation of the SI and DPA implemented together. FR: Faraday rotator. BCN: birefringent crystal at position N in the sequence. The green arrows represent the direction of propagation while red and dash blue arrows stand for the polarization states.

Fig. 3
Fig. 3

Experimental setup of SI and DPA together with two birefringent vanadate crystals. AOM: acousto-optic modulator.

Fig. 4
Fig. 4

Left: spectrum of 200 nJ pulses obtained with different numbers of spatial and temporal divisions. Right: Corresponding autocorrelations.

Fig. 5
Fig. 5

Left: Large temporal range autocorrelations for 200 nJ and 3.1 µJ output energies using 4 DPA replicas and the Sagnac geometry together. Right: Corresponding short range autocorrelations.

Fig. 6
Fig. 6

Left: temporal pulse profile of the 3.1 µJ pulse retrieved from FROG measurement, along with the FROG trace (inset). Right: corresponding spectrum.

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