Abstract

We have demonstrated ultra-high efficiency amplification in Tm-doped fiber with both core- and cladding-pumped configurations using a resonant tandem-pumping approach. These Tm-doped fiber amplifiers are pumped in-band with a 1908 nm Tm-doped fiber laser and operate at 1993 nm with >90% slope efficiency. In a core-pumped configuration, we have achieved 92.1% slope efficiency and 88.4% optical efficiency at 41 W output power. In a cladding-pumped configuration, we have achieved 123.1 W of output power with 90.4% optical efficiency and a 91.6% slope efficiency. We believe these are the highest optical efficiencies achieved in a Tm-doped fiber amplifier operating in the 2-micron spectral region.

© 2014 Optical Society of America

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References

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2014 (1)

2013 (1)

2011 (3)

2010 (1)

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

2009 (2)

M. Dubinskii, J. Zhang, and V. Ter-Mikirtychev, “Record-efficient, resonantly-pumped, Er-doped singlemode fiber amplifier,” Electron. Lett. 45(8), 400–401 (2009).
[Crossref]

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

2008 (3)

P. F. Moulton, “Power scaling of high-efficiency Tm-doped fiber lasers,” Proc. SPIE 6873, 687315 (2008).

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

2004 (1)

B. M. Walsh and N. P. Barnes, “Comparison of Tm:ZBLAN and Tm:silica fiber lasers; spectroscopy and tunable pulsed laser operation around 1.9µm,” Appl. Phys. B 78(3-4), 325–333 (2004).
[Crossref]

2003 (1)

1999 (1)

Alkeskjold, T. T.

Barnes, N. P.

B. M. Walsh and N. P. Barnes, “Comparison of Tm:ZBLAN and Tm:silica fiber lasers; spectroscopy and tunable pulsed laser operation around 1.9µm,” Appl. Phys. B 78(3-4), 325–333 (2004).
[Crossref]

Barty, C. P. J.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Bass, M.

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

Beach, R. J.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Book, L. D.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Broeng, J.

Bullington, A. L.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

Carter, A. L. G.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

Chicklis, E. P.

Creeden, D.

Dawson, J. W.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Dubinskii, M.

J. Zhang, V. Fromzel, and M. Dubinskii, “Resonantly cladding-pumped Yb-free Er-doped LMA fiber laser with record high power and efficiency,” Opt. Express 19(6), 5574–5578 (2011).
[Crossref] [PubMed]

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

M. Dubinskii, J. Zhang, and V. Ter-Mikirtychev, “Record-efficient, resonantly-pumped, Er-doped singlemode fiber amplifier,” Electron. Lett. 45(8), 400–401 (2009).
[Crossref]

Frith, G.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

Fromzel, V.

Goodno, G. D.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Hansen, K. R.

Heebner, J. E.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Jackson, S. D.

Ji, J.

J. Ji, S. Yoo, P. Shum, and J. Nilsson, “Minimize quantum-defect heating in thulium-doped silica fiber amplifiers by tandem-pumping,” in Proceedings of IEEE Photonics Global Conference (2012).

Johnson, B. R.

King, T. A.

Lægsgaard, J.

Messerly, M. J.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Mossman, S.

Moulton, P. F.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

P. F. Moulton, “Power scaling of high-efficiency Tm-doped fiber lasers,” Proc. SPIE 6873, 687315 (2008).

Nilsson, J.

J. Ji, S. Yoo, P. Shum, and J. Nilsson, “Minimize quantum-defect heating in thulium-doped silica fiber amplifiers by tandem-pumping,” in Proceedings of IEEE Photonics Global Conference (2012).

Pax, P. H.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Richardson, M.

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

Rines, G. A.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

Rothenberg, J. E.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Samson, B.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

Setzler, S. D.

Shum, P.

J. Ji, S. Yoo, P. Shum, and J. Nilsson, “Minimize quantum-defect heating in thulium-doped silica fiber amplifiers by tandem-pumping,” in Proceedings of IEEE Photonics Global Conference (2012).

Shverdin, M. Y.

Siders, C. W.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Slobodtchikov, E. V.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

Smith, A. V.

Smith, J. J.

Sridharan, A. K.

J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
[Crossref]

J. W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, “Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power,” Opt. Express 16(17), 13240–13266 (2008).
[Crossref] [PubMed]

Stappaerts, E. A.

Sudesh, V.

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

Ter-Mikirtychev, V.

M. Dubinskii, J. Zhang, and V. Ter-Mikirtychev, “Record-efficient, resonantly-pumped, Er-doped singlemode fiber amplifier,” Electron. Lett. 45(8), 400–401 (2009).
[Crossref]

Toncelli, A.

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

Tonelli, M.

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

Turri, G.

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
[Crossref]

Wall, K. F.

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
[Crossref]

Walsh, B. M.

B. M. Walsh and N. P. Barnes, “Comparison of Tm:ZBLAN and Tm:silica fiber lasers; spectroscopy and tunable pulsed laser operation around 1.9µm,” Appl. Phys. B 78(3-4), 325–333 (2004).
[Crossref]

Weber, M. E.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Weiss, S. B.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Yoo, S.

J. Ji, S. Yoo, P. Shum, and J. Nilsson, “Minimize quantum-defect heating in thulium-doped silica fiber amplifiers by tandem-pumping,” in Proceedings of IEEE Photonics Global Conference (2012).

Zhang, J.

J. Zhang, V. Fromzel, and M. Dubinskii, “Resonantly cladding-pumped Yb-free Er-doped LMA fiber laser with record high power and efficiency,” Opt. Express 19(6), 5574–5578 (2011).
[Crossref] [PubMed]

M. Dubinskii, J. Zhang, and V. Ter-Mikirtychev, “Record-efficient, resonantly-pumped, Er-doped singlemode fiber amplifier,” Electron. Lett. 45(8), 400–401 (2009).
[Crossref]

Appl. Opt. (1)

Appl. Phys. B (1)

B. M. Walsh and N. P. Barnes, “Comparison of Tm:ZBLAN and Tm:silica fiber lasers; spectroscopy and tunable pulsed laser operation around 1.9µm,” Appl. Phys. B 78(3-4), 325–333 (2004).
[Crossref]

Electron. Lett. (1)

M. Dubinskii, J. Zhang, and V. Ter-Mikirtychev, “Record-efficient, resonantly-pumped, Er-doped singlemode fiber amplifier,” Electron. Lett. 45(8), 400–401 (2009).
[Crossref]

IEEE J. Sel. Top. Quantum Electron. (1)

P. F. Moulton, G. A. Rines, E. V. Slobodtchikov, K. F. Wall, G. Frith, B. Samson, and A. L. G. Carter, “Tm-doped fiber lasers: Fundamentals and power scaling,” IEEE J. Sel. Top. Quantum Electron. 15(1), 85–92 (2009).
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J. Appl. Phys. (1)

G. Turri, V. Sudesh, M. Richardson, M. Bass, A. Toncelli, and M. Tonelli, “Temperature-dependent spectroscopic properties of Tm3+ in germinate, silica, and phosphate glasses: a comparative study,” J. Appl. Phys. 103(9), 093104 (2008).
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Opt. Eng. (1)

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
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J. W. Dawson, M. J. Messerly, J. E. Heebner, P. H. Pax, A. K. Sridharan, A. L. Bullington, R. J. Beach, C. W. Siders, C. P. J. Barty, and M. Dubinskii, “Power scaling analysis of fiber lasers and amplifiers based on non-silica materials,” Proc. SPIE 7686, 768611 (2010).
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P. F. Moulton, “Power scaling of high-efficiency Tm-doped fiber lasers,” Proc. SPIE 6873, 687315 (2008).

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T. Ehrenreich, R. Leveille, I. Majid, K. Tankala, G. Rines, and P. F. Moulton, “1kW, all-glass Tm:fiber laser,” presented at SPIE Photonics West, Fiber Lasers VII: Technology, Systems, and Applications, San Francisco, CA, 23–28 January 2010.

A. Hemming, N. Simakov, A. Davidson, S. Bennetts, M. Hughes, N. Carmody, P. Davies, L. Corena, D. Stepanov, J. Haub, R. Swain, and A. Carter, “A monolithic cladding pumped holmium-doped fibre laser,” in Conference on Lasers and Electro-Optics 2013, OSA Technical Digest (Optical Society of America, 2013), paper CW1M.1.
[Crossref]

M. Meleshkevich, N. Platonov, D. Gapontsev, A. Drozhzhin, V. Sergeev, and V. Gapontsev, “415W Single-Mode CW Thulium Fiber Laser in all-fiber format,” in CLEO/Europe and IQEC 2007 Conference, OSA Technical Digest (Optical Society of America, 2007), paper CP2_3.

P. Moulton, “High power Tm:silica fiber lasers: current status, prospects and challenges,” in CLEO/Europe and EQEC 2011 Conference, OSA Technical Digest (Optical Society of America, 2011), paper TF2_3.

S. Christensen, “Narrow linewidth fiber amplifiers,” in Advanced Photonics Congress, OSA Technical Digest (Optical Society of America, 2012), paper SW3F.3.
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V. Gapontsev, V. Fomin, A. Ferin, and M. Abramov, “Diffraction limited ultra-high-power fiber lasers,” in Lasers, Sources and Related Photonic Devices, OSA Technical Digest (Optical Society of America, 2010), paper AWA1.

J. Ji, S. Yoo, P. Shum, and J. Nilsson, “Minimize quantum-defect heating in thulium-doped silica fiber amplifiers by tandem-pumping,” in Proceedings of IEEE Photonics Global Conference (2012).

C. A. Codemard, J. Nilsson, and J. K. Sahu, “Tandem Pumping of large-core double-clad ytterbium-doped fiber for control of excess gain,” in Advanced Solid-State Photonics, 2010 OSA Technical Digest (Optical Society of America, 2010), paper AWA3.

A. Carter, A. Hemming, and N. Simakov, “An efficient, high power, monolithic, single mode thulium fibre laser,” in Workshop on Specialty Optical Fibers and their Applications, OSA Technical Digest, (Optical Society of America, 2013), paper T2.4.
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D. J. Creeden, B. R. Johnson, and S. D. Setzler, “High efficiency 1908nm Tm-doped fiber laser oscillator,” in Advanced Photonics Congress, OSA Technical Digest (Optical Society of America, 2012), paper SW2F.4.
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T. Yao, J. Ji, J. K. Sahu, A. Webb, and J. Nilsson, “Tandem-pumped Ytterbium-doped aluminosilicate fiber amplifier with low quantum defect,” in Conference on Lasers and Electro-Optics 2012, OSA Technical Digest (Optical Society of America, 2012), paper CM4N.7.
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Figures (13)

Fig. 1
Fig. 1 Absorption and emission cross-sections of Tm-doped fiber based on measured data and [1115, 1719]. Dashed lines indicate common pumping regions for Tm-doped fibers.
Fig. 2
Fig. 2 Cross-sectional views of both fibers used in this testing. (a) Low concentration fiber (TDF-LC); (b) high concentration fiber (TDF-HC).
Fig. 3
Fig. 3 Experimental setup used to measure pump transmission and bleaching.
Fig. 4
Fig. 4 Pump transmission versus pump intensity at 1908 nm. Blue dots are measured values for TDF-LC; blue dashed line is a fit to the data. Red squares are measured values for TDF-HC; red dotted line is a fit to the data.
Fig. 5
Fig. 5 Schematic of the core-pumped experimental setup.
Fig. 6
Fig. 6 Core-pumped fiber amplifier results. (a) Amplifier extracted power versus launched 1908 nm pump power for both the TDF-LC and TDF-HC fibers; (b) amplifier efficiency versus launched pump intensity. Data points represent measured data. Dashed lines are fits to the data.
Fig. 7
Fig. 7 Unfiltered output spectrum of core-pumped amplifier.
Fig. 8
Fig. 8 Schematic of the cladding-pumped experimental setup. This is an identical configuration to the core-pumped configuration, except the passive fiber and cladding stripper at the input of the amplifier are removed.
Fig. 9
Fig. 9 Cladding-pumped amplifier results. (a) Amplifier extracted power versus launched 1908 nm pump power for both the TDF-LC and TDF-HC fibers; (b) amplifier efficiency versus launched pump intensity. Data points represent measured data. Dashed lines are fits to the data.
Fig. 10
Fig. 10 Filtered output spectrum from a cladding-pumped amplifier over a broad spectral range showing 1993 nm output with no residual pump. Inset: Amplifier output spectrum over a narrow spectral window.
Fig. 11
Fig. 11 Plot of slope efficiency versus Tm-doped fiber length for a 65 W amplifier. Both plots are the same but with different lower bounds on the Y-axis. (a) Full scale showing relatively flat performance; (b) zoomed-in scale on Y-axis to show detail in the slope efficiency changes versus length. The TDF-LC was used for this measurement.
Fig. 12
Fig. 12 Power scaled cladding-pumped amplifier results. (a) Efficiency and total output power versus launched pump power using 4.5 m of the TDF-HC fiber. Data points represent measured data. Dashed lines are linear fits to the data. (b) Amplifier temporal characteristics over 15 seconds of operation measured with an extended InGaAs detector.
Fig. 13
Fig. 13 Pump power absorption as a function of fiber length for the TDF-LC and TDF-HC fibers when cladding/pedestal-pumping (in the absence of extraction). Solid lines show the absorption with the effect of bleaching. Dashed lines show the Beer’s Law absorption.

Tables (2)

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Table 1 Calculated Tm-doped Fiber Parameters Based on Pump Transmission Measurements

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Table 2 Summary of High Power 2-micron Generation in Silica Fibers

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