Abstract

We present a compact thulium-doped chirped pulse amplifier producing 241 fs pulses with 1 μJ energy. The system is seeded with the Raman shifted soliton generated by the combination of an erbium-doped femtosecond laser and a nonlinear fiber. The Tm-doped large mode area fiber yields output power of 71 W, corresponding to pulse energy of 2.04 μJ, with a slope efficiency of 52.2%. The amplified pulses have been compressed to a duration time of 241 fs, using a folded Treacy grating setup. The pulse energy is measured to be 1.02 μJ, corresponding to a peak power of ~3 MW. To the best of our knowledge, this is the highest average power and pulse energy generated from an all-fiber, Raman shifted soliton seeded thulium-doped chirped pulse amplifier system.

© 2016 Optical Society of America

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References

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  1. C. W. Rudy, M. J. F. Digonnet, and R. L. Byer, “Advances in 2-μm Tm-doped mode-locked fiber lasers,” Opt. Fiber Technol. 20(6), 642–649 (2014).
    [Crossref]
  2. P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
    [Crossref]
  3. K. D. Polder and S. Bruce, “Treatment of melasma using a novel 1,927-nm fractional thulium fiber laser: a pilot study,” Dermatol. Surg. 38(2), 199–206 (2012).
    [Crossref] [PubMed]
  4. I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
    [Crossref]
  5. F. Adler and S. A. Diddams, “High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 μm wavelength region,” Opt. Lett. 37(9), 1400–1402 (2012).
    [Crossref] [PubMed]
  6. C. W. Rudy, A. Marandi, K. L. Vodopyanov, and R. L. Byer, “Octave-spanning supercontinuum generation in in situ tapered As2S3 fiber pumped by a thulium-doped fiber laser,” Opt. Lett. 38(15), 2865–2868 (2013).
    [Crossref] [PubMed]
  7. K. Liu, J. Liu, H. Shi, F. Tan, and P. Wang, “High power mid-infrared supercontinuum generation in a single-mode ZBLAN fiber with up to 21.8 W average output power,” Opt. Express 22(20), 24384–24391 (2014).
    [Crossref] [PubMed]
  8. N. Leindecker, A. Marandi, R. L. Byer, K. L. Vodopyanov, J. Jiang, I. Hartl, M. Fermann, and P. G. Schunemann, “Octave-spanning ultrafast OPO with 2.6-6.1 µm instantaneous bandwidth pumped by femtosecond Tm-fiber laser,” Opt. Express 20(7), 7046–7053 (2012).
    [Crossref] [PubMed]
  9. M. Gebhardt, C. Gaida, F. Stutzki, C. Jauregui, J. Limpert, and A. Tünnermann, “Sub-200 fs, nJ-level stretched-pulse thulium-doped fiber oscillator at 23MHz repetition rate,” in Advanced Solid State Lasers, OSA Technical Digest (online) (Optical Society of America, 2014), paper AM5A.43.
  10. M. Gebhardt, C. Gaida, F. Stutzki, S. Hädrich, C. Jauregui, J. Limpert, and A. Tünnermann, “Impact of atmospheric molecular absorption on the temporal and spatial evolution of ultra-short optical pulses,” Opt. Express 23(11), 13776–13787 (2015).
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  11. R. Gumenyuk, I. Vartiainen, H. Tuovinen, and O. G. Okhotnikov, “Dissipative dispersion-managed soliton 2 μm thulium/holmium fiber laser,” Opt. Lett. 36(5), 609–611 (2011).
    [Crossref] [PubMed]
  12. A. Wienke, F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, “Ultrafast, stretched-pulse thulium-doped fiber laser with a fiber-based dispersion management,” Opt. Lett. 37(13), 2466–2468 (2012).
    [Crossref] [PubMed]
  13. F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, “Monotonically chirped pulse evolution in an ultrashort pulse thulium-doped fiber laser,” Opt. Lett. 37(6), 1014–1016 (2012).
    [Crossref] [PubMed]
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    [Crossref] [PubMed]
  16. R. Herda and A. Zach, “All-fiber generation of few-cycle pulses at 1950 nm by triple-stage compression of a Thulium-doped laser system,” in Proceedings of IEEE Conference on Photonics Conference (IEEE, 2013), pp. 621–622.
    [Crossref]
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    [Crossref] [PubMed]
  18. F. Tauser, F. Adler, and A. Leitenstorfer, “Widely tunable sub-30-fs pulses from a compact erbium-doped fiber source,” Opt. Lett. 29(5), 516–518 (2004).
    [Crossref] [PubMed]
  19. A. Sell, G. Krauss, R. Scheu, R. Huber, and A. Leitenstorfer, “8-fs pulses from a compact Er:fiber system: quantitative modeling and experimental implementation,” Opt. Express 17(2), 1070–1077 (2009).
    [Crossref] [PubMed]
  20. S. Kumkar, G. Krauss, M. Wunram, D. Fehrenbacher, U. Demirbas, D. Brida, and A. Leitenstorfer, “Femtosecond coherent seeding of a broadband Tm:fiber amplifier by an Er:fiber system,” Opt. Lett. 37(4), 554–556 (2012).
    [Crossref] [PubMed]
  21. D. Brida, G. Krauss, A. Sell, and A. Leitenstorfer, “Ultrabroadband Er:fiber lasers,” Laser Photonics Rev. 8(3), 409–428 (2014).
    [Crossref]
  22. R. A. Sims, P. Kadwani, A. S. Shah, M. Richardson, and M. Richardson, “1 μJ, sub-500 fs chirped pulse amplification in a Tm-doped fiber system,” Opt. Lett. 38(2), 121–123 (2013).
    [Crossref] [PubMed]
  23. 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]
  24. Y. Kim, Y. J. Kim, S. Kim, and S. W. Kim, “Er-doped fiber comb with enhanced fceo S/N ratio using Tm:Ho-doped fiber,” Opt. Express 17(21), 18606–18611 (2009).
    [Crossref] [PubMed]

2016 (1)

2015 (1)

2014 (3)

K. Liu, J. Liu, H. Shi, F. Tan, and P. Wang, “High power mid-infrared supercontinuum generation in a single-mode ZBLAN fiber with up to 21.8 W average output power,” Opt. Express 22(20), 24384–24391 (2014).
[Crossref] [PubMed]

C. W. Rudy, M. J. F. Digonnet, and R. L. Byer, “Advances in 2-μm Tm-doped mode-locked fiber lasers,” Opt. Fiber Technol. 20(6), 642–649 (2014).
[Crossref]

D. Brida, G. Krauss, A. Sell, and A. Leitenstorfer, “Ultrabroadband Er:fiber lasers,” Laser Photonics Rev. 8(3), 409–428 (2014).
[Crossref]

2013 (2)

2012 (7)

S. Kumkar, G. Krauss, M. Wunram, D. Fehrenbacher, U. Demirbas, D. Brida, and A. Leitenstorfer, “Femtosecond coherent seeding of a broadband Tm:fiber amplifier by an Er:fiber system,” Opt. Lett. 37(4), 554–556 (2012).
[Crossref] [PubMed]

F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, “Monotonically chirped pulse evolution in an ultrashort pulse thulium-doped fiber laser,” Opt. Lett. 37(6), 1014–1016 (2012).
[Crossref] [PubMed]

N. Leindecker, A. Marandi, R. L. Byer, K. L. Vodopyanov, J. Jiang, I. Hartl, M. Fermann, and P. G. Schunemann, “Octave-spanning ultrafast OPO with 2.6-6.1 µm instantaneous bandwidth pumped by femtosecond Tm-fiber laser,” Opt. Express 20(7), 7046–7053 (2012).
[Crossref] [PubMed]

F. Adler and S. A. Diddams, “High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 μm wavelength region,” Opt. Lett. 37(9), 1400–1402 (2012).
[Crossref] [PubMed]

A. Wienke, F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, “Ultrafast, stretched-pulse thulium-doped fiber laser with a fiber-based dispersion management,” Opt. Lett. 37(13), 2466–2468 (2012).
[Crossref] [PubMed]

K. D. Polder and S. Bruce, “Treatment of melasma using a novel 1,927-nm fractional thulium fiber laser: a pilot study,” Dermatol. Surg. 38(2), 199–206 (2012).
[Crossref] [PubMed]

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

2011 (2)

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

R. Gumenyuk, I. Vartiainen, H. Tuovinen, and O. G. Okhotnikov, “Dissipative dispersion-managed soliton 2 μm thulium/holmium fiber laser,” Opt. Lett. 36(5), 609–611 (2011).
[Crossref] [PubMed]

2009 (2)

2005 (1)

2004 (1)

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]

1986 (1)

Adler, F.

Altal, F.

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Brida, D.

Bruce, S.

K. D. Polder and S. Bruce, “Treatment of melasma using a novel 1,927-nm fractional thulium fiber laser: a pilot study,” Dermatol. Surg. 38(2), 199–206 (2012).
[Crossref] [PubMed]

Byer, R. L.

Chia, J.

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Demirbas, U.

Diddams, S. A.

Digonnet, M. J. F.

C. W. Rudy, M. J. F. Digonnet, and R. L. Byer, “Advances in 2-μm Tm-doped mode-locked fiber lasers,” Opt. Fiber Technol. 20(6), 642–649 (2014).
[Crossref]

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]

Fehrenbacher, D.

Fermann, M.

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]

Gaida, C.

Gebhardt, M.

Gordon, J. P.

Gumenyuk, R.

Hädrich, S.

Hartl, I.

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]

Haxsen, F.

Herda, R.

R. Herda and A. Zach, “All-fiber generation of few-cycle pulses at 1950 nm by triple-stage compression of a Thulium-doped laser system,” in Proceedings of IEEE Conference on Photonics Conference (IEEE, 2013), pp. 621–622.
[Crossref]

Huber, R.

Imeshev, G.

Jauregui, C.

Jiang, J.

Kadwani, P.

R. A. Sims, P. Kadwani, A. S. Shah, M. Richardson, and M. Richardson, “1 μJ, sub-500 fs chirped pulse amplification in a Tm-doped fiber system,” Opt. Lett. 38(2), 121–123 (2013).
[Crossref] [PubMed]

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Killinger, D.

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Kim, S.

Kim, S. W.

Kim, Y.

Kim, Y. J.

Kracht, D.

Krauss, G.

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]

Kumkar, S.

Leindecker, N.

Leitenstorfer, A.

Limpert, J.

Liu, J.

Liu, K.

Marandi, A.

Mingareev, I.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

Morgner, U.

Neumann, J.

Okhotnikov, O. G.

Olowinsky, A.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

Polder, K. D.

K. D. Polder and S. Bruce, “Treatment of melasma using a novel 1,927-nm fractional thulium fiber laser: a pilot study,” Dermatol. Surg. 38(2), 199–206 (2012).
[Crossref] [PubMed]

Richardson, M.

Richardson, M. C.

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Rudy, C. W.

Scheu, R.

Schunemann, P. G.

Sell, A.

Shah, A. S.

Shah, L.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Shi, H.

Sims, R. A.

R. A. Sims, P. Kadwani, A. S. Shah, M. Richardson, and M. Richardson, “1 μJ, sub-500 fs chirped pulse amplification in a Tm-doped fiber system,” Opt. Lett. 38(2), 121–123 (2013).
[Crossref] [PubMed]

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Stutzki, F.

Tan, F.

Tauser, 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.

Tuovinen, H.

Vartiainen, I.

Vodopyanov, K. L.

Wandt, D.

Wang, P.

Weirauch, F.

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

Wienke, A.

Willis, C.

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Wunram, M.

Zach, A.

R. Herda and A. Zach, “All-fiber generation of few-cycle pulses at 1950 nm by triple-stage compression of a Thulium-doped laser system,” in Proceedings of IEEE Conference on Photonics Conference (IEEE, 2013), pp. 621–622.
[Crossref]

Dermatol. Surg. (1)

K. D. Polder and S. Bruce, “Treatment of melasma using a novel 1,927-nm fractional thulium fiber laser: a pilot study,” Dermatol. Surg. 38(2), 199–206 (2012).
[Crossref] [PubMed]

Laser Photonics Rev. (1)

D. Brida, G. Krauss, A. Sell, and A. Leitenstorfer, “Ultrabroadband Er:fiber lasers,” Laser Photonics Rev. 8(3), 409–428 (2014).
[Crossref]

Opt. Express (6)

Opt. Fiber Technol. (1)

C. W. Rudy, M. J. F. Digonnet, and R. L. Byer, “Advances in 2-μm Tm-doped mode-locked fiber lasers,” Opt. Fiber Technol. 20(6), 642–649 (2014).
[Crossref]

Opt. Laser Technol. (1)

I. Mingareev, F. Weirauch, A. Olowinsky, L. Shah, P. Kadwani, and M. Richardson, “Welding of polymers using a 2 μm thulium fiber laser,” Opt. Laser Technol. 44(7), 2095–2099 (2012).
[Crossref]

Opt. Lett. (10)

F. Adler and S. A. Diddams, “High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 μm wavelength region,” Opt. Lett. 37(9), 1400–1402 (2012).
[Crossref] [PubMed]

C. W. Rudy, A. Marandi, K. L. Vodopyanov, and R. L. Byer, “Octave-spanning supercontinuum generation in in situ tapered As2S3 fiber pumped by a thulium-doped fiber laser,” Opt. Lett. 38(15), 2865–2868 (2013).
[Crossref] [PubMed]

C. Gaida, M. Gebhardt, F. Stutzki, C. Jauregui, J. Limpert, and A. Tünnermann, “Thulium-doped fiber chirped-pulse amplification system with 2 GW of peak power,” Opt. Lett. 41(17), 4130–4133 (2016).
[Crossref] [PubMed]

F. Tauser, F. Adler, and A. Leitenstorfer, “Widely tunable sub-30-fs pulses from a compact erbium-doped fiber source,” Opt. Lett. 29(5), 516–518 (2004).
[Crossref] [PubMed]

R. Gumenyuk, I. Vartiainen, H. Tuovinen, and O. G. Okhotnikov, “Dissipative dispersion-managed soliton 2 μm thulium/holmium fiber laser,” Opt. Lett. 36(5), 609–611 (2011).
[Crossref] [PubMed]

A. Wienke, F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, “Ultrafast, stretched-pulse thulium-doped fiber laser with a fiber-based dispersion management,” Opt. Lett. 37(13), 2466–2468 (2012).
[Crossref] [PubMed]

F. Haxsen, D. Wandt, U. Morgner, J. Neumann, and D. Kracht, “Monotonically chirped pulse evolution in an ultrashort pulse thulium-doped fiber laser,” Opt. Lett. 37(6), 1014–1016 (2012).
[Crossref] [PubMed]

J. P. Gordon, “Theory of the soliton self-frequency shift,” Opt. Lett. 11(10), 662–664 (1986).
[Crossref] [PubMed]

S. Kumkar, G. Krauss, M. Wunram, D. Fehrenbacher, U. Demirbas, D. Brida, and A. Leitenstorfer, “Femtosecond coherent seeding of a broadband Tm:fiber amplifier by an Er:fiber system,” Opt. Lett. 37(4), 554–556 (2012).
[Crossref] [PubMed]

R. A. Sims, P. Kadwani, A. S. Shah, M. Richardson, and M. Richardson, “1 μJ, sub-500 fs chirped pulse amplification in a Tm-doped fiber system,” Opt. Lett. 38(2), 121–123 (2013).
[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]

Proc. SPIE (1)

P. Kadwani, J. Chia, F. Altal, R. A. Sims, C. Willis, L. Shah, D. Killinger, and M. C. Richardson, “Atmospheric absorption spectroscopy using Tm: fiber sources around two microns,” Proc. SPIE 7924, 79240L (2011).
[Crossref]

Other (2)

M. Gebhardt, C. Gaida, F. Stutzki, C. Jauregui, J. Limpert, and A. Tünnermann, “Sub-200 fs, nJ-level stretched-pulse thulium-doped fiber oscillator at 23MHz repetition rate,” in Advanced Solid State Lasers, OSA Technical Digest (online) (Optical Society of America, 2014), paper AM5A.43.

R. Herda and A. Zach, “All-fiber generation of few-cycle pulses at 1950 nm by triple-stage compression of a Thulium-doped laser system,” in Proceedings of IEEE Conference on Photonics Conference (IEEE, 2013), pp. 621–622.
[Crossref]

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Figures (7)

Fig. 1
Fig. 1

Experimental setup of thulium-doped CPA system. ISO: isolator; TDF: thulium-doped fiber; LMA-TDF: large mode area thulium-doped fiber.

Fig. 2
Fig. 2

Spectral traces of the erbium-doped fiber oscillator, amplifier and compressor.

Fig. 3
Fig. 3

Spectra of the generated supercontinuum before (pink line) and after (blue line) Tm:Ho-doped fiber, the generated supercontinuum at highest pump power (orange line) and the amplified Raman pulses after LMA Tm-doped fiber (olive line).

Fig. 4
Fig. 4

Output power (black square point) and output power after compression (red circle dot) as a function of pump power in the final power amplifier.

Fig. 5
Fig. 5

(a) Output optical spectrum of the compressed pulses measured at highest pulse energy. Inset: the output spectrum with logarithmic scale; (b) Autocorrelation trace of the compressed pulse with 1.02 μJ output pulse energy.

Fig. 6
Fig. 6

M2 measurement performed using a scanning slit beam profilers system. Inset, near-field beam intensity profile at average output power of 70 W.

Fig. 7
Fig. 7

Measured RF spectra of the compressed pulsewith 1 MHz span and resolution of 300 Hz.

Metrics