Abstract

We demonstrate an all-fiber-integrated, high-power chirped-pulse-amplification system operating at 1550 nm. The seed source is a soliton fiber laser with 156 MHz repetition rate. Two-stage single mode amplifier provides an amplification of more than 40 dB without significant spontaneous amplified emission. The power amplifier is based on cladding-pumped 10 µm-core Er-Yb co-doped fiber, the output of which was spliced into standard singlemode fiber. We obtain 10 W average power in a strictly singlemode operation. After dechirping with a grating compressor, near transform-limited, 450 fs-long pulses are obtained. The laser source exhibits excellent short and long-term intensity stability, with relative intensity noise measurements characterizing the short-term stability.

© 2012 OSA

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References

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  1. D. J. Richardson, J. Nilsson, and W. A. Clarkson, “High power fiber lasers: current status and futures perspectives [Invited],” J. Opt. Soc. Am. B 27(11), B63–B87 (2010).
    [CrossRef]
  2. O. Lumholt, T. Rasmussen, and A. Bjarklev, “Modelling of extremely high concentration erbium-doped silica waveguides,” Electron. Lett. 29(5), 495–496 (1993).
    [CrossRef]
  3. Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
    [CrossRef]
  4. B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).
  5. J. C. Jasapara, M. J. Andrejco, J. W. Nicholson, A. D. Yablon, and Z. Várallyay, “Simultaneous direct amplification and compression of picosecond pulses to 65-kW peak power without pulse break-up in erbium fiber,” Opt. Express 15(26), 17494–17501 (2007).
    [CrossRef] [PubMed]
  6. J. C. Jasapara, A. DeSantolo, J. W. Nicholson, A. D. Yablon, and Z. Várallyay, “Diffraction limited amplification of picosecond pulses in 1170 microm2 effective area erbium fiber,” Opt. Express 16(23), 18869–18874 (2008).
    [CrossRef] [PubMed]
  7. J. C. Jasapara, M. J. Andrejco, A. D. Yablon, J. W. Nicholson, C. Headley, and D. DiGiovanni, “Picosecond pulse amplification in a core-pumped large-mode-area erbium fiber,” Opt. Lett. 32(16), 2429–2431 (2007).
    [CrossRef] [PubMed]
  8. J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
    [CrossRef]
  9. M. E. Fermann, A. Galvanauskas, and M. Hofer, “Ultrafast pulse sources based on multi-mode optical fibers,” Appl. Phys. B 70(S1), S13–S23 (2000) (and references therein).
    [CrossRef]
  10. F. Morin, F. Druon, M. Hanna, and P. Georges, “Microjoule femtosecond fiber laser at 1.6 microm for corneal surgery applications,” Opt. Lett. 34(13), 1991–1993 (2009).
    [CrossRef] [PubMed]
  11. I. L. Budunoğlu, C. Ulgüdür, B. Oktem, and F. Ö. Ilday, “Intensity noise of mode-locked fiber lasers,” Opt. Lett. 34(16), 2516–2518 (2009).
    [CrossRef] [PubMed]
  12. K. Gürel, P. Elahi, Ç. Şenel, P. Paltani, and F. Ö. Ilday, “Influence of modulation of pump and seed signals on fiber amplification of broadband pulses,” in CLEO:2011 - Laser Applications to Photonic Applications, OSA Technical Digest (Optical Society of America, 2011), paper CThU5.
  13. R. P. Scott, C. Langrock, and B. H. Kolner, “High dynamic range laser amplitude and phase noise measurement techniques,” IEEE J. Sel. Top. Quantum Electron. 7(4), 641–655 (2001).
    [CrossRef]

2010 (1)

2009 (3)

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

F. Morin, F. Druon, M. Hanna, and P. Georges, “Microjoule femtosecond fiber laser at 1.6 microm for corneal surgery applications,” Opt. Lett. 34(13), 1991–1993 (2009).
[CrossRef] [PubMed]

I. L. Budunoğlu, C. Ulgüdür, B. Oktem, and F. Ö. Ilday, “Intensity noise of mode-locked fiber lasers,” Opt. Lett. 34(16), 2516–2518 (2009).
[CrossRef] [PubMed]

2008 (1)

2007 (4)

J. C. Jasapara, M. J. Andrejco, A. D. Yablon, J. W. Nicholson, C. Headley, and D. DiGiovanni, “Picosecond pulse amplification in a core-pumped large-mode-area erbium fiber,” Opt. Lett. 32(16), 2429–2431 (2007).
[CrossRef] [PubMed]

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

J. C. Jasapara, M. J. Andrejco, J. W. Nicholson, A. D. Yablon, and Z. Várallyay, “Simultaneous direct amplification and compression of picosecond pulses to 65-kW peak power without pulse break-up in erbium fiber,” Opt. Express 15(26), 17494–17501 (2007).
[CrossRef] [PubMed]

2001 (1)

R. P. Scott, C. Langrock, and B. H. Kolner, “High dynamic range laser amplitude and phase noise measurement techniques,” IEEE J. Sel. Top. Quantum Electron. 7(4), 641–655 (2001).
[CrossRef]

2000 (1)

M. E. Fermann, A. Galvanauskas, and M. Hofer, “Ultrafast pulse sources based on multi-mode optical fibers,” Appl. Phys. B 70(S1), S13–S23 (2000) (and references therein).
[CrossRef]

1993 (1)

O. Lumholt, T. Rasmussen, and A. Bjarklev, “Modelling of extremely high concentration erbium-doped silica waveguides,” Electron. Lett. 29(5), 495–496 (1993).
[CrossRef]

Agger, S.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Andrejco, M. J.

Bjarklev, A.

O. Lumholt, T. Rasmussen, and A. Bjarklev, “Modelling of extremely high concentration erbium-doped silica waveguides,” Electron. Lett. 29(5), 495–496 (1993).
[CrossRef]

Budunoglu, I. L.

Chatigny, S.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Clarkson, W. A.

Codemard, C. A.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

de Sandro, J.-P.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

DeSantolo, A.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

J. C. Jasapara, A. DeSantolo, J. W. Nicholson, A. D. Yablon, and Z. Várallyay, “Diffraction limited amplification of picosecond pulses in 1170 microm2 effective area erbium fiber,” Opt. Express 16(23), 18869–18874 (2008).
[CrossRef] [PubMed]

DiGiovanni, D.

DiGiovanni, D. J.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

DiMarcello, F. V.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

Druon, F.

Fermann, M. E.

M. E. Fermann, A. Galvanauskas, and M. Hofer, “Ultrafast pulse sources based on multi-mode optical fibers,” Appl. Phys. B 70(S1), S13–S23 (2000) (and references therein).
[CrossRef]

Fini, J. M.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

Gagnon, É.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Galvanauskas, A.

M. E. Fermann, A. Galvanauskas, and M. Hofer, “Ultrafast pulse sources based on multi-mode optical fibers,” Appl. Phys. B 70(S1), S13–S23 (2000) (and references therein).
[CrossRef]

Georges, P.

Hanna, M.

Harker, A.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Headley, C.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

J. C. Jasapara, M. J. Andrejco, A. D. Yablon, J. W. Nicholson, C. Headley, and D. DiGiovanni, “Picosecond pulse amplification in a core-pumped large-mode-area erbium fiber,” Opt. Lett. 32(16), 2429–2431 (2007).
[CrossRef] [PubMed]

Hickey, L.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Hofer, M.

M. E. Fermann, A. Galvanauskas, and M. Hofer, “Ultrafast pulse sources based on multi-mode optical fibers,” Appl. Phys. B 70(S1), S13–S23 (2000) (and references therein).
[CrossRef]

Horley, R.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Hovington, C.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Ilday, F. Ö.

Jasapara, J. C.

Jeong, Y.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Kolner, B. H.

R. P. Scott, C. Langrock, and B. H. Kolner, “High dynamic range laser amplitude and phase noise measurement techniques,” IEEE J. Sel. Top. Quantum Electron. 7(4), 641–655 (2001).
[CrossRef]

Langrock, C.

R. P. Scott, C. Langrock, and B. H. Kolner, “High dynamic range laser amplitude and phase noise measurement techniques,” IEEE J. Sel. Top. Quantum Electron. 7(4), 641–655 (2001).
[CrossRef]

Lovelady, M.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Lumholt, O.

O. Lumholt, T. Rasmussen, and A. Bjarklev, “Modelling of extremely high concentration erbium-doped silica waveguides,” Electron. Lett. 29(5), 495–496 (1993).
[CrossRef]

Monberg, E.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

Morasse, B.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Morin, F.

Nicholson, J. W.

Nilsson, J.

D. J. Richardson, J. Nilsson, and W. A. Clarkson, “High power fiber lasers: current status and futures perspectives [Invited],” J. Opt. Soc. Am. B 27(11), B63–B87 (2010).
[CrossRef]

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Oktem, B.

Payne, D. N.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Piper, A.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Poulsen, C.

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Rasmussen, T.

O. Lumholt, T. Rasmussen, and A. Bjarklev, “Modelling of extremely high concentration erbium-doped silica waveguides,” Electron. Lett. 29(5), 495–496 (1993).
[CrossRef]

Richardson, D. J.

Sahu, J. K.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Scott, R. P.

R. P. Scott, C. Langrock, and B. H. Kolner, “High dynamic range laser amplitude and phase noise measurement techniques,” IEEE J. Sel. Top. Quantum Electron. 7(4), 641–655 (2001).
[CrossRef]

Turner, P. W.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Ulgüdür, C.

Várallyay, Z.

Vrallyay, Z.

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

Yablon, A. D.

Yoo, S.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

Appl. Phys. B (1)

M. E. Fermann, A. Galvanauskas, and M. Hofer, “Ultrafast pulse sources based on multi-mode optical fibers,” Appl. Phys. B 70(S1), S13–S23 (2000) (and references therein).
[CrossRef]

Electron. Lett. (1)

O. Lumholt, T. Rasmussen, and A. Bjarklev, “Modelling of extremely high concentration erbium-doped silica waveguides,” Electron. Lett. 29(5), 495–496 (1993).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (3)

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:Ytterbium co-doped large core fiber laser with 297-W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron. 13(3), 573–579 (2007).
[CrossRef]

J. C. Jasapara, M. J. Andrejco, A. DeSantolo, A. D. Yablon, Z. Vrallyay, J. W. Nicholson, J. M. Fini, D. J. DiGiovanni, C. Headley, E. Monberg, and F. V. DiMarcello, “Diffraction limited fundamental mode operation of core-pumped very-large-mode-area Er fiber amplifiers,” IEEE J. Sel. Top. Quantum Electron. 15(1), 3–11 (2009).
[CrossRef]

R. P. Scott, C. Langrock, and B. H. Kolner, “High dynamic range laser amplitude and phase noise measurement techniques,” IEEE J. Sel. Top. Quantum Electron. 7(4), 641–655 (2001).
[CrossRef]

J. Opt. Soc. Am. B (1)

Opt. Express (2)

Opt. Lett. (3)

Proc. SPIE (1)

B. Morasse, S. Agger, C. Hovington, S. Chatigny, É. Gagnon, J.-P. de Sandro, and C. Poulsen, “10W ASE-free single-mode high-power double-cladding Er3+-Yb3+ amplifier,” Proc. SPIE 6453, 645324 (1–8) (2007).

Other (1)

K. Gürel, P. Elahi, Ç. Şenel, P. Paltani, and F. Ö. Ilday, “Influence of modulation of pump and seed signals on fiber amplification of broadband pulses,” in CLEO:2011 - Laser Applications to Photonic Applications, OSA Technical Digest (Optical Society of America, 2011), paper CThU5.

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Figures (3)

Fig. 1
Fig. 1

Schematic of the experiment setup for pulsed operation. WDM: wavelength division multiplexer. Inset: the cooling system of the splice point between DC Er-Yb co-doped gain fiber of amplifier and passive DC fiber.

Fig. 2
Fig. 2

The experimental characterization of the amplifier system working in the CW mode: (a) Measured optical spectrum of the seed source (red line), preamplifier output (green line), and power amplifier output (blue line). (b) RIN level of the seed (red line), preamplifier (green line), power amplifier (blue line), and noise floor (black line).

Fig. 3
Fig. 3

(a) Measured optical spectrum of the seed (blue line), preamplifier (red line) and power amplifier output at 10 W (black line). (b) Intensity autocorrelation of the dechirped pulses at full amplifier output. Inset: Dependence of beam diameter at the 1/e-level on position, along with fitted M2 values.

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