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. 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]

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]

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]

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]

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]

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

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]

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]

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]

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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