Abstract

We report on an efficient, narrow linewidth, two-stage fiber amplifier at 1014.8nm based on Yb-doped double-clad fibers. The fibers are cooled to liquid-nitrogen temperatures in order to suppress absorption at the operating wavelength. We achieved output powers of up to 5.0W at a linewidth of less than 3MHz by seeding the amplifier with the radiation from an external cavity diode laser.

© 2006 Optical Society of America

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  1. E. Desurvire, Erbium-Doped Fiber Amplifiers (Wiley, 1994).
  2. E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.
  3. Y. Jeong, J. Sahu, D. Payne, and J. Nilsson, "Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power," Opt. Express 12, 6088-6092 (2004).
    [CrossRef] [PubMed]
  4. R. Nicolaescu, T. Walther, E. Fry, and M. Muendel, "Ultranarrow-linewidth, efficient amplification of low-power seed sources by a fiber amplifier," Appl. Opt. 38, 1784-1787 (1999).
    [CrossRef]
  5. L. Goldberg, J. Koplow, and D. A. Kliner, "Highly efficient 4-W Yb-doped fiber amplifier pumped by a broad-stripe laser diode," Opt. Lett. 24, 673-675 (1999).
    [CrossRef]
  6. S. Höfer, A. Liem, J. Limpert, H. Zellmer, A. Tünnermann, S. Unger, S. Jetschke, H.-R. Müller, and I. Freitag, "Single-frequency master-oscillator fiber power amplifier system emitting 20 W of power," Opt. Lett. 26, 1326-1328 (2001).
    [CrossRef]
  7. A. Liem, J. Limpert, H. Zellmer, and A. Tünnermann, "100-W single-frequency master-oscillator fiber power amplifier," Opt. Lett. 28, 1537-1539 (2003).
    [CrossRef] [PubMed]
  8. Y. Jeong, J. Nilsson, J. K. Sahu, D. B. S. Soh, C. Alegria, P. Dupriez, C. A. Codemard, D. N. Payne, R. Horley, L. M. B. Hickey, L. Wanzcyk, C. E. Chryssou, J. A. Alvarez-Chavez, and P. W. Turner, "Single-frequency, single-mode, plane-polarized ytterbium-doped fiber master oscillator power amplifier source with 264 W of output power," Opt. Lett. 30, 459-462 (2005).
    [CrossRef] [PubMed]
  9. D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
    [CrossRef]
  10. J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
    [CrossRef]
  11. R. Paschotta, J. Nilsson, A. Tropper, and D. Hanna, "Ytterbium-doped fiber amplifiers," IEEE J. Quantum Electron . 33, 1049-1056 (1997).
    [CrossRef]
  12. D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
    [CrossRef]
  13. N. Park and P. F. Wysocki, "24-Line multiwavelength operation of erbium-doped fiber-ring laser," IEEE Photon. Technol. Lett. 8, 1459-1461 (1996).
    [CrossRef]
  14. X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
    [CrossRef]
  15. R. Hayashi, S. Yamashita, and T. Saida, "16-wavelength 10-GHz actively mode-locked fiber laser with demultiplexed outputs anchored on the ITU-T grid," IEEE Photon. Technol. Lett. 15, 1692-1694 (2003).
    [CrossRef]
  16. J. Schneider, C. Carbonnier, and U. B. Unrau, "Characterization of a Ho3+-doped fluoride fiber laser with a 3.9 μm emission wavelength," Appl. Opt. 36, 8595-8600 (1997).
    [CrossRef]
  17. T. Walther, "Prospects of trapping neutral mercury: formation of vibrationally cold molecules and entanglement of atoms," in Interactions in Ultracold Gases:From Atoms to Molecules (Wiley-VCH, 2003), pp. 405-406.
  18. E. S. Fry, M. Lukin, T. Walther, and G. R. Welch, "Four-level atomic coherence and cw VUV lasers," Opt. Commun. 79, 499 (2000).
    [CrossRef]
  19. T. Walther and E. S. Fry, "Mercury:the Rosetta Stone of physics?" J. Opt. B: Quantum Semiclass. Opt. 4, S376-S383 (2002).
    [CrossRef]
  20. A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).
  21. K. Mörl, IPHT, Jena, Germany (personal communication, 2004).
  22. M. Auerbach, D. Wandt, C. Fallnich, H. Welling, and S. Unger, "High-power tunable narrow line width ytterbium-doped double-clad fiber laser," Opt. Commun. 195, 437-441 (2001).
    [CrossRef]
  23. I. Zawischa, K. Plamann, C. Fallnich, H. Welling, H. Zellmer, and A. Tunnermann, "All-solid-state neodymium-based single-frequency master-oscillator fiber power-amplifier system emitting 5.5 W of radiation at 1064 nm," Opt. Lett. 24, 469-471 (1999).
    [CrossRef]

2005 (2)

2004 (2)

2003 (3)

A. Liem, J. Limpert, H. Zellmer, and A. Tünnermann, "100-W single-frequency master-oscillator fiber power amplifier," Opt. Lett. 28, 1537-1539 (2003).
[CrossRef] [PubMed]

R. Hayashi, S. Yamashita, and T. Saida, "16-wavelength 10-GHz actively mode-locked fiber laser with demultiplexed outputs anchored on the ITU-T grid," IEEE Photon. Technol. Lett. 15, 1692-1694 (2003).
[CrossRef]

T. Walther, "Prospects of trapping neutral mercury: formation of vibrationally cold molecules and entanglement of atoms," in Interactions in Ultracold Gases:From Atoms to Molecules (Wiley-VCH, 2003), pp. 405-406.

2002 (1)

T. Walther and E. S. Fry, "Mercury:the Rosetta Stone of physics?" J. Opt. B: Quantum Semiclass. Opt. 4, S376-S383 (2002).
[CrossRef]

2001 (3)

M. Auerbach, D. Wandt, C. Fallnich, H. Welling, and S. Unger, "High-power tunable narrow line width ytterbium-doped double-clad fiber laser," Opt. Commun. 195, 437-441 (2001).
[CrossRef]

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

S. Höfer, A. Liem, J. Limpert, H. Zellmer, A. Tünnermann, S. Unger, S. Jetschke, H.-R. Müller, and I. Freitag, "Single-frequency master-oscillator fiber power amplifier system emitting 20 W of power," Opt. Lett. 26, 1326-1328 (2001).
[CrossRef]

2000 (2)

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

E. S. Fry, M. Lukin, T. Walther, and G. R. Welch, "Four-level atomic coherence and cw VUV lasers," Opt. Commun. 79, 499 (2000).
[CrossRef]

1999 (3)

1997 (2)

J. Schneider, C. Carbonnier, and U. B. Unrau, "Characterization of a Ho3+-doped fluoride fiber laser with a 3.9 μm emission wavelength," Appl. Opt. 36, 8595-8600 (1997).
[CrossRef]

R. Paschotta, J. Nilsson, A. Tropper, and D. Hanna, "Ytterbium-doped fiber amplifiers," IEEE J. Quantum Electron . 33, 1049-1056 (1997).
[CrossRef]

1996 (1)

N. Park and P. F. Wysocki, "24-Line multiwavelength operation of erbium-doped fiber-ring laser," IEEE Photon. Technol. Lett. 8, 1459-1461 (1996).
[CrossRef]

1994 (1)

E. Desurvire, Erbium-Doped Fiber Amplifiers (Wiley, 1994).

1990 (1)

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

1988 (2)

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Alegria, C.

Alvarez-Chavez, J.

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

Alvarez-Chavez, J. A.

Auerbach, M.

M. Auerbach, D. Wandt, C. Fallnich, H. Welling, and S. Unger, "High-power tunable narrow line width ytterbium-doped double-clad fiber laser," Opt. Commun. 195, 437-441 (2001).
[CrossRef]

Carbonnier, C.

Chiang, K.

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

Chryssou, C. E.

Chu, B.

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

Codemard, C. A.

Desurvire, E.

E. Desurvire, Erbium-Doped Fiber Amplifiers (Wiley, 1994).

Dong, X.

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

Dupriez, P.

Eikema, K. S. E.

A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).

Fallnich, C.

Fendel, P.

A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).

Freitag, I.

Fry, E.

Fry, E. S.

T. Walther and E. S. Fry, "Mercury:the Rosetta Stone of physics?" J. Opt. B: Quantum Semiclass. Opt. 4, S376-S383 (2002).
[CrossRef]

E. S. Fry, M. Lukin, T. Walther, and G. R. Welch, "Four-level atomic coherence and cw VUV lasers," Opt. Commun. 79, 499 (2000).
[CrossRef]

Furusawa, K.

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

Goldberg, L.

Hakimi, F.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Hanna, D.

R. Paschotta, J. Nilsson, A. Tropper, and D. Hanna, "Ytterbium-doped fiber amplifiers," IEEE J. Quantum Electron . 33, 1049-1056 (1997).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Hänsch, T. W.

A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).

Hayashi, R.

R. Hayashi, S. Yamashita, and T. Saida, "16-wavelength 10-GHz actively mode-locked fiber laser with demultiplexed outputs anchored on the ITU-T grid," IEEE Photon. Technol. Lett. 15, 1692-1694 (2003).
[CrossRef]

Henrich, B. R.

A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).

Hickey, L. M. B.

Höfer, S.

Horley, R.

Jeong, Y.

Jetschke, S.

Kliner, D. A.

Koplow, J.

Li, S.

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

Liem, A.

Limpert, J.

Lukin, M.

E. S. Fry, M. Lukin, T. Walther, and G. R. Welch, "Four-level atomic coherence and cw VUV lasers," Opt. Commun. 79, 499 (2000).
[CrossRef]

McCollum, B.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Mörl, K.

K. Mörl, IPHT, Jena, Germany (personal communication, 2004).

Muendel, M.

Müller, H.-R.

Ng, M.

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

Nicolaescu, R.

Nilsson, J.

Pahl, A.

A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).

Park, N.

N. Park and P. F. Wysocki, "24-Line multiwavelength operation of erbium-doped fiber-ring laser," IEEE Photon. Technol. Lett. 8, 1459-1461 (1996).
[CrossRef]

Paschotta, R.

R. Paschotta, J. Nilsson, A. Tropper, and D. Hanna, "Ytterbium-doped fiber amplifiers," IEEE J. Quantum Electron . 33, 1049-1056 (1997).
[CrossRef]

Payne, D.

Payne, D. N.

Percival, R.

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Perry, I.

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Plamann, K.

Po, H.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Renaud, C.

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

Richardson, D. J.

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

Sahu, J.

Y. Jeong, J. Sahu, D. Payne, and J. Nilsson, "Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power," Opt. Express 12, 6088-6092 (2004).
[CrossRef] [PubMed]

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

Sahu, J. K.

Saida, T.

R. Hayashi, S. Yamashita, and T. Saida, "16-wavelength 10-GHz actively mode-locked fiber laser with demultiplexed outputs anchored on the ITU-T grid," IEEE Photon. Technol. Lett. 15, 1692-1694 (2003).
[CrossRef]

Schneider, J.

Selvas, R.

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

Smart, R.

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Snitzer, E.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Soh, D. B. S.

Suni, P.

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Townsend, J.

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Tropper, A.

R. Paschotta, J. Nilsson, A. Tropper, and D. Hanna, "Ytterbium-doped fiber amplifiers," IEEE J. Quantum Electron . 33, 1049-1056 (1997).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

Tumminelli, R.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Tunnermann, A.

Tünnermann, A.

Turner, P. W.

Unger, S.

S. Höfer, A. Liem, J. Limpert, H. Zellmer, A. Tünnermann, S. Unger, S. Jetschke, H.-R. Müller, and I. Freitag, "Single-frequency master-oscillator fiber power amplifier system emitting 20 W of power," Opt. Lett. 26, 1326-1328 (2001).
[CrossRef]

M. Auerbach, D. Wandt, C. Fallnich, H. Welling, and S. Unger, "High-power tunable narrow line width ytterbium-doped double-clad fiber laser," Opt. Commun. 195, 437-441 (2001).
[CrossRef]

Unrau, U. B.

Walther, T.

T. Walther, "Prospects of trapping neutral mercury: formation of vibrationally cold molecules and entanglement of atoms," in Interactions in Ultracold Gases:From Atoms to Molecules (Wiley-VCH, 2003), pp. 405-406.

T. Walther and E. S. Fry, "Mercury:the Rosetta Stone of physics?" J. Opt. B: Quantum Semiclass. Opt. 4, S376-S383 (2002).
[CrossRef]

E. S. Fry, M. Lukin, T. Walther, and G. R. Welch, "Four-level atomic coherence and cw VUV lasers," Opt. Commun. 79, 499 (2000).
[CrossRef]

R. Nicolaescu, T. Walther, E. Fry, and M. Muendel, "Ultranarrow-linewidth, efficient amplification of low-power seed sources by a fiber amplifier," Appl. Opt. 38, 1784-1787 (1999).
[CrossRef]

Walz, J.

A. Pahl, P. Fendel, B. R. Henrich, J. Walz, T. W. Hänsch, and K. S. E. Eikema, "Generation of continuous coherent radiation at Lyman-α and 1S --> 2P spectroscopy of atomic hydrogen," Laser Phys. 15, 46-54 (2005).

Wandt, D.

M. Auerbach, D. Wandt, C. Fallnich, H. Welling, and S. Unger, "High-power tunable narrow line width ytterbium-doped double-clad fiber laser," Opt. Commun. 195, 437-441 (2001).
[CrossRef]

Wanzcyk, L.

Welch, G. R.

E. S. Fry, M. Lukin, T. Walther, and G. R. Welch, "Four-level atomic coherence and cw VUV lasers," Opt. Commun. 79, 499 (2000).
[CrossRef]

Welling, H.

Wysocki, P. F.

N. Park and P. F. Wysocki, "24-Line multiwavelength operation of erbium-doped fiber-ring laser," IEEE Photon. Technol. Lett. 8, 1459-1461 (1996).
[CrossRef]

Yamashita, S.

R. Hayashi, S. Yamashita, and T. Saida, "16-wavelength 10-GHz actively mode-locked fiber laser with demultiplexed outputs anchored on the ITU-T grid," IEEE Photon. Technol. Lett. 15, 1692-1694 (2003).
[CrossRef]

Zawischa, I.

Zellmer, H.

Appl. Opt. (2)

Electron. Lett. (3)

X. Dong, S. Li, K. Chiang, M. Ng, and B. Chu, "Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror," Electron. Lett. 36, 1609-1610 (2000).
[CrossRef]

J. Sahu, C. Renaud, K. Furusawa, R. Selvas, J. Alvarez-Chavez, D. J. Richardson, and J. Nilsson, "Jacketed air clad cladding pumped ytterbium doped fibre laser with wide tuning range," Electron. Lett. 37, 1116-1117 (2001).
[CrossRef]

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, J. Townsend, and A. Tropper, "Continuous-wave oscillation of a mono-mode ytterbium doped fibre laser," Electron. Lett. 24, 1111-1113 (1988).
[CrossRef]

IEEE J. Quantum Electron (1)

R. Paschotta, J. Nilsson, A. Tropper, and D. Hanna, "Ytterbium-doped fiber amplifiers," IEEE J. Quantum Electron . 33, 1049-1056 (1997).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

N. Park and P. F. Wysocki, "24-Line multiwavelength operation of erbium-doped fiber-ring laser," IEEE Photon. Technol. Lett. 8, 1459-1461 (1996).
[CrossRef]

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[CrossRef]

J. Mod. Opt. (1)

D. Hanna, R. Percival, I. Perry, R. Smart, P. Suni, and A. Tropper, "An ytterbium-doped monomode fibre laser: broadly tunable operation from 1010 μm to 1.162 μm and three-level operation at 974 nm," J. Mod. Opt. 37, 517-525 (1990).
[CrossRef]

J. Opt. B: Quantum Semiclass. Opt. (1)

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[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Absorption spectra for our Yb-doped fiber at room temperature (dashed curve) and cooled to liquid-nitrogen temperature (solid curve) as recorded using a white-light source. Data above 990 nm are also shown multiplied by a factor of 10 for clarity.

Fig. 2
Fig. 2

Setup of the two-stage fiber amplifier:ECDL, seed diode; FI, Faraday isolator; DM, dichroic mirror; M, mirror; IRIS, aperture; ASE, filter to suppress ASE; PD18, pump diode ( 18 W ); EDGE, edge filter to suppress residual pump; PD24, pump diode ( 24 W ); OSA, optical spectrum analyzer; PM, powermeter.

Fig. 3
Fig. 3

Output power versus pump power for the first amplifier stage. Open symbols (○) denote the raw data. Data represented by solid symbols (●) were corrected for the actual pump power absorbed and filter transmissions.

Fig. 4
Fig. 4

Broadband spectrum for the second stage. Before entering the OSA, the radiation passed an edge filter to suppress residual pump radiation. The inset shows the corresponding spectrum of the first stage after the radiation passed a 1014 nm filter.

Fig. 5
Fig. 5

Output power versus pump power for the second stage. The first stage was operated at an output level of 1.7 W . Open symbols (○) denote the raw data. Data represented by solid symbols (●) were corrected for the actual pump power absorbed and filter transmissions.

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