Abstract

We demonstrate a new high efficiency architecture for cascaded Raman fiber lasers based on a single pass cascaded amplifier configuration. Conversion is seeded at all intermediate Stokes wavelengths using a multi-wavelength seed source. A lower power Raman laser based on the conventional cascaded Raman resonator architecture provides a convenient seed source providing all the necessary wavelengths simultaneously. In this work we demonstrate a 1480nm laser pumped by an 1117nm Yb-doped fiber laser with maximum output power of 204W and conversion efficiency of 65% (quantum-limited efficiency is ~75%). We believe both the output power and conversion efficiency (relative to quantum-limited efficiency) are the highest reported for cascaded Raman fiber lasers.

© 2013 OSA

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  1. S. G. Grubb, T. Erdogan, V. Mizrahi, T. Strasser, W. Y. Cheung, W. A. Reed, P. J. Lemaire, A. E. Miller, S. G. Kosinski, G. Nykolak, and P. C. Becker, “High power, 1.48 µm cascaded Raman laser in germanosilicate fibers,” OSA Topic. Meeting, Optic. Amp. and Their Applications (1994).
  2. S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
    [CrossRef]
  3. Z. Xiong, N. Moore, Z. G. Li, and G. C. Lim, “10-W Raman fiber lasers at 1248 nm Using phosphosilicate fibers,” J. Lightwave Technol.21(10), 2377–2381 (2003).
    [CrossRef]
  4. Y. Feng, L. R. Taylor, and D. B. Calia, “150 W highly-efficient Raman fiber laser,” Opt. Express17(26), 23678–23683 (2009).
    [CrossRef] [PubMed]
  5. R. Vallee, E. Belanger, B. Dery, M. Bernier, and D. Faucher, “Highly efficient and High-power Raman fiber laser based on broadband chirped fiber Bragg gratings,” J. Lightwave Technol.24(12), 5039–5043 (2006).
    [CrossRef]
  6. C. Headley and G. P. Agrawal, Raman Amplification in Fiber Optical Communication Systems (Elsevier, 2005).
  7. D. Georgiev, V. P. Gapontsev, A. G. Dronov, M. Y. Vyatkin, A. B. Rulkov, S. V. Popov, and J. R. Taylor, “Watts-level frequency doubling of a narrow line linearly polarized Raman fiber laser to 589nm,” Opt. Express13(18), 6772–6776 (2005).
    [CrossRef] [PubMed]
  8. J. C. Jasapara, M. J. Andrejco, A. D. Yablon, J. W. Nicholson, C. E. Headley, and D. J. DiGiovanni, “Picosecond pulse amplification in a core-pumped large-mode-area erbium fiber,” Opt. Lett.32(16), 2429–2431 (2007).
    [CrossRef] [PubMed]
  9. J. W. Nicholson, J. M. Fini, A. M. DeSantolo, X. Liu, K. Feder, P. S. Westbrook, V. R. Supradeepa, E. Monberg, F. DiMarcello, R. Ortiz, C. Headley, and D. J. DiGiovanni, “Scaling the effective area of higher-order-mode erbium-doped fiber amplifiers,” Opt. Express20(22), 24575–24584 (2012).
    [CrossRef] [PubMed]
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  11. Y. Emori, K. Tanaka, C. Headley, and A. Fujisaki, “High-power cascaded Raman fiber laser with 41-W output power at 1480-nm band,” in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, OSA Technical Digest Series (CD) (OSA, 2007), paper CFI2.
    [CrossRef]
  12. J. W. Nicholson, M. F. Yan, P. Wisk, J. Fleming, F. DiMarcello, E. Monberg, T. Taunay, C. Headley, and D. J. DiGiovanni, “Raman fiber laser with 81 W output power at 1480 nm,” Opt. Lett.35(18), 3069–3071 (2010).
    [CrossRef] [PubMed]
  13. M. A. Arbore, Y. Zhou, G. Keaton, and T. Kane, “36dB gain in S-band EDFA with distributed ASE suppression,” in Optical Amplifiers and Their Applications, J. Nagel, S. Namiki, and L. Spiekman, eds., Vol. 77 of OSA Trends in Optics and Photonics Series (Optical Society of America, 2002), paper PD4.
  14. P. D. Dragic, “Suppression of first order stimulated Raman scattering in erbium-doped fiber laser based LIDAR transmitters through induced bending loss,” Opt. Commun.250(4-6), 403–410 (2005).
    [CrossRef]
  15. J. Kim, P. Dupriez, C. Codemard, J. Nilsson, and J. K. Sahu, “Suppression of stimulated Raman scattering in a high power Yb-doped fiber amplifier using a W-type core with fundamental mode cut-off,” Opt. Express14(12), 5103–5113 (2006).
    [CrossRef] [PubMed]
  16. V. R. Supradeepa, J. W. Nicholson, C. E. Headley, Y. Lee, B. Palsdottir, and D. Jakobsen, “Cascaded Raman fiber faser at 1480nm with output power of 104W,” no. 8237–48, SPIE photonics west 2012.
  17. Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. M. B. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:ytterbium codoped large-core fiber laser with 297 W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron.13(3), 573–579 (2007).
    [CrossRef]
  18. V. Kuhn, D. Kracht, J. Neumann, and P. Wessels, “Er-doped photonic crystal fiber amplifier with 70 W of output power,” Opt. Lett.36(16), 3030–3032 (2011).
    [CrossRef] [PubMed]
  19. W. A. Reed, A. J. Stentz, and T. A. Strasser, “Article comprising a cascaded raman fiber laser,” U.S. Patent 5,815,518 (1998).
  20. C. Headley and G. Agrawal, “Raman amplification in fiber optical communication systems,” (Academic Press, 2005).
  21. M. Rini, I. Cristiani, and V. Degiorgio, “Numerical modeling and optimization of cascaded CW Raman fiber lasers,” IEEE J. Quantum Electron.36(10), 1117–1122 (2000).
    [CrossRef]
  22. S. D. Jackson and P. H. Muir, “Theory and numerical simulation of nth-order cascaded Raman fiber lasers,” J. Opt. Soc. Am. B18(9), 1297–1306 (2001).
    [CrossRef]
  23. S. B. Papernyi, V. I. Karpov, and W. R. L. Clements, “Third-order cascaded Raman amplification,” in Optical Fiber Communication Conference (OFC) 2002, FB4–1.IEEE, (2002).
    [CrossRef]
  24. S. Papernyi, V. Karpov, and W. Clements, “Cascaded pumping system and method for producing distributed Raman amplification in optical fiber telecommunication systems,” U. S. Patent 6,480,326 (2002).
  25. http://ofscatalog.specialityphotonics.com/category/high-power-products-and-cladding-pumped-fibers .
  26. Y. Jeong, J. Sahu, D. Payne, and J. Nilsson, “Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power,” Opt. Express12(25), 6088–6092 (2004).
    [CrossRef] [PubMed]

2012

2011

2010

2009

2007

J. C. Jasapara, M. J. Andrejco, A. D. Yablon, J. W. Nicholson, C. E. Headley, and D. J. 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. M. B. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:ytterbium codoped large-core fiber laser with 297 W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron.13(3), 573–579 (2007).
[CrossRef]

2006

2005

D. Georgiev, V. P. Gapontsev, A. G. Dronov, M. Y. Vyatkin, A. B. Rulkov, S. V. Popov, and J. R. Taylor, “Watts-level frequency doubling of a narrow line linearly polarized Raman fiber laser to 589nm,” Opt. Express13(18), 6772–6776 (2005).
[CrossRef] [PubMed]

P. D. Dragic, “Suppression of first order stimulated Raman scattering in erbium-doped fiber laser based LIDAR transmitters through induced bending loss,” Opt. Commun.250(4-6), 403–410 (2005).
[CrossRef]

2004

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

Y. Jeong, J. Sahu, D. Payne, and J. Nilsson, “Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power,” Opt. Express12(25), 6088–6092 (2004).
[CrossRef] [PubMed]

2003

2001

2000

M. Rini, I. Cristiani, and V. Degiorgio, “Numerical modeling and optimization of cascaded CW Raman fiber lasers,” IEEE J. Quantum Electron.36(10), 1117–1122 (2000).
[CrossRef]

Andrejco, M. J.

Belanger, E.

Bernier, M.

Calia, D. B.

Chia, L. C.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

Codemard, C.

Codemard, C. A.

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

Cristiani, I.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

M. Rini, I. Cristiani, and V. Degiorgio, “Numerical modeling and optimization of cascaded CW Raman fiber lasers,” IEEE J. Quantum Electron.36(10), 1117–1122 (2000).
[CrossRef]

Degiorgio, V.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

M. Rini, I. Cristiani, and V. Degiorgio, “Numerical modeling and optimization of cascaded CW Raman fiber lasers,” IEEE J. Quantum Electron.36(10), 1117–1122 (2000).
[CrossRef]

Dery, B.

DeSantolo, A. M.

DiGiovanni, D. J.

DiMarcello, F.

Dragic, P. D.

P. D. Dragic, “Suppression of first order stimulated Raman scattering in erbium-doped fiber laser based LIDAR transmitters through induced bending loss,” Opt. Commun.250(4-6), 403–410 (2005).
[CrossRef]

Dronov, A. G.

Dupriez, P.

Faucher, D.

Feder, K.

Feng, Y.

Fini, J. M.

Fleming, J.

Gapontsev, V. P.

Georgiev, D.

Harker, A.

Y. Jeong, S. Yoo, C. A. Codemard, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, P. W. Turner, L. M. B. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:ytterbium codoped 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.

Headley, C. E.

Hickey, L. M. B.

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

Horley, R.

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

Jackson, S. D.

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. M. B. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:ytterbium codoped large-core fiber laser with 297 W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron.13(3), 573–579 (2007).
[CrossRef]

Y. Jeong, J. Sahu, D. Payne, and J. Nilsson, “Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power,” Opt. Express12(25), 6088–6092 (2004).
[CrossRef] [PubMed]

Kim, J.

Kracht, D.

Kuhn, V.

Lee, L. W.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

Li, Z. G.

Lim, G. C.

Lim, H. C.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

Liu, X.

Lovelady, M.

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

Monberg, E.

Moore, N.

Muir, P. H.

Neumann, J.

Nicholson, J. W.

Nilsson, J.

Ortiz, R.

Payne, D.

Payne, D. N.

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

Popov, S. V.

Rini, M.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

M. Rini, I. Cristiani, and V. Degiorgio, “Numerical modeling and optimization of cascaded CW Raman fiber lasers,” IEEE J. Quantum Electron.36(10), 1117–1122 (2000).
[CrossRef]

Rulkov, A. B.

Sahu, 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. M. B. Hickey, A. Harker, M. Lovelady, and A. Piper, “Erbium:ytterbium codoped large-core fiber laser with 297 W continuous-wave output power,” IEEE J. Sel. Top. Quantum Electron.13(3), 573–579 (2007).
[CrossRef]

J. Kim, P. Dupriez, C. Codemard, J. Nilsson, and J. K. Sahu, “Suppression of stimulated Raman scattering in a high power Yb-doped fiber amplifier using a W-type core with fundamental mode cut-off,” Opt. Express14(12), 5103–5113 (2006).
[CrossRef] [PubMed]

Sim, S. K.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

Supradeepa, V. R.

Taunay, T.

Taylor, J. R.

Taylor, L. R.

Turner, P. W.

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

Vallee, R.

Vyatkin, M. Y.

Wessels, P.

Westbrook, P. S.

Wisk, P.

Wu, R. F.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

Xiong, Z.

Yablon, A. D.

Yan, M. F.

Yoo, S.

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

Electron. Lett.

S. K. Sim, H. C. Lim, L. W. Lee, L. C. Chia, R. F. Wu, I. Cristiani, M. Rini, and V. Degiorgio, “High-power cascaded Raman fibre laser using phosphosilicate fiber,” Electron. Lett.40(12), 738–739 (2004).
[CrossRef]

IEEE J. Quantum Electron.

M. Rini, I. Cristiani, and V. Degiorgio, “Numerical modeling and optimization of cascaded CW Raman fiber lasers,” IEEE J. Quantum Electron.36(10), 1117–1122 (2000).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron.

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

J. Lightwave Technol.

J. Opt. Soc. Am. B

Opt. Commun.

P. D. Dragic, “Suppression of first order stimulated Raman scattering in erbium-doped fiber laser based LIDAR transmitters through induced bending loss,” Opt. Commun.250(4-6), 403–410 (2005).
[CrossRef]

Opt. Express

Opt. Lett.

Other

W. A. Reed, A. J. Stentz, and T. A. Strasser, “Article comprising a cascaded raman fiber laser,” U.S. Patent 5,815,518 (1998).

C. Headley and G. Agrawal, “Raman amplification in fiber optical communication systems,” (Academic Press, 2005).

M. A. Arbore, Y. Zhou, G. Keaton, and T. Kane, “36dB gain in S-band EDFA with distributed ASE suppression,” in Optical Amplifiers and Their Applications, J. Nagel, S. Namiki, and L. Spiekman, eds., Vol. 77 of OSA Trends in Optics and Photonics Series (Optical Society of America, 2002), paper PD4.

V. R. Supradeepa, J. W. Nicholson, C. E. Headley, Y. Lee, B. Palsdottir, and D. Jakobsen, “Cascaded Raman fiber faser at 1480nm with output power of 104W,” no. 8237–48, SPIE photonics west 2012.

V. R. Supradeepa, J. W. Nicholson, and K. Feder, “Continuous wave Erbium-doped fiber laser with output power of >100 W at 1550 nm in-band core-pumped by a 1480nm Raman fiber laser,” in CLEO: Science and Innovations, OSA Technical Digest (online) (Optical Society of America, 2012), paper CM2N.8.

Y. Emori, K. Tanaka, C. Headley, and A. Fujisaki, “High-power cascaded Raman fiber laser with 41-W output power at 1480-nm band,” in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, OSA Technical Digest Series (CD) (OSA, 2007), paper CFI2.
[CrossRef]

C. Headley and G. P. Agrawal, Raman Amplification in Fiber Optical Communication Systems (Elsevier, 2005).

S. G. Grubb, T. Erdogan, V. Mizrahi, T. Strasser, W. Y. Cheung, W. A. Reed, P. J. Lemaire, A. E. Miller, S. G. Kosinski, G. Nykolak, and P. C. Becker, “High power, 1.48 µm cascaded Raman laser in germanosilicate fibers,” OSA Topic. Meeting, Optic. Amp. and Their Applications (1994).

S. B. Papernyi, V. I. Karpov, and W. R. L. Clements, “Third-order cascaded Raman amplification,” in Optical Fiber Communication Conference (OFC) 2002, FB4–1.IEEE, (2002).
[CrossRef]

S. Papernyi, V. Karpov, and W. Clements, “Cascaded pumping system and method for producing distributed Raman amplification in optical fiber telecommunication systems,” U. S. Patent 6,480,326 (2002).

http://ofscatalog.specialityphotonics.com/category/high-power-products-and-cladding-pumped-fibers .

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Figures (7)

Fig. 1
Fig. 1

(a) Schematic of a cascaded Raman laser, RIG – Raman input grating set, ROG – Raman output grating set, (b) Components of a cascaded Raman resonator converting 1117nm input to 1480nm output, HR – High reflectivity grating (> 99%), OC – output coupler, low reflectivity (< 10%) grating

Fig. 2
Fig. 2

Transmission function of the filter fiber used in the 1480 nm laser.

Fig. 3
Fig. 3

(a) Schematic of the new cascaded Raman laser, RIG, ROG – Raman input and output grating sets (b) Spectrum measured at the output with only the seed source turned on

Fig. 4
Fig. 4

Plot of total output power and components at each Stokes wavelength as a function of input power at 1117nm

Fig. 5
Fig. 5

(a) Plot of total output power and output power at 1480 nm as a function of input power at 1117 nm, (b) Spectrum of the output in linear and log scale (inset) at maximum power

Fig. 6
Fig. 6

(a) Comparison of output power at 1480nm as a function of input power at 1117nm between the new and conventional architectures with the quantum limited conversion. (b) Comparison of conversion efficiencies

Fig. 7
Fig. 7

A lower power demonstration – (a) Output power and 1480 nm component for a 75W Raman laser as a function of input power at 1117nm (b) Spectrum obtained at full power in linear and log scale.

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