Abstract

Al-silicate fibers have excellent manufacturing quality. Unfortunately, high-Yb doping concentration may be limited by severe losses induced by photodarkening phenomenon. In this paper we demonstrate for the first time that Al-silicate Yb-doped fibers with high-inversion and doping concentration above 1 wt% can be successfully used by implementing a simple optical bleaching scheme. A co-injection into the active fiber of a few mW of light at around 550 nm wavelength successfully eliminates almost all photodarkening induced losses. We demonstrate operation at above 90% of the pristine output power level in several lasers with up to 30% Yb ions in the excited state. These results may allow using Yb-doped Al-silicate fibers with doping level increased by one order of magnitude. Finally, we provide a comprehensive picture of main parameters affecting photobleaching performance and, to the best of our knowledge, we report the first quantitative measurement of the Ytterbium excited state absorption cross-section in the visible range.

© 2014 Optical Society of America

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    [CrossRef]

2013 (5)

2012 (2)

2011 (5)

2010 (3)

2009 (4)

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

S. Jetschke, U. Röpke, S. Unger, J. Kirchhof, “Characterization of photodarkening processes in Yb doped fibers,” Proc. SPIE 7195, 71952B (2009).
[CrossRef]

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

S. Jetschke, U. Röpke, “Power-law dependence of the photodarkening rate constant on the inversion in Yb doped fibers,” Opt. Lett. 34(1), 109–111 (2009).
[CrossRef] [PubMed]

2008 (3)

2007 (5)

2006 (1)

2004 (1)

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

1997 (1)

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

Alombert-Goget, G.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Barber, P. R.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

Barmenkov, Y. O.

A. D. G. Chávez, A. V. Kir’yanov, Y. O. Barmenkov, N. N. Il’ichev, “Reversible photo-darkening and resonant photobleaching of ytterbium-doped silica fiber at in-core 977-nm and 543-nm irradiation,” Laser Phys. Lett. 4(10), 734–739 (2007).
[CrossRef]

Basu, C.

Bello Doua, R.

Boullet, J.

Boyland, A. J.

Cadier, B.

Caplen, J. E.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

Cardinal, T.

Chaussedent, S.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Chávez, A. D. G.

A. D. G. Chávez, A. V. Kir’yanov, Y. O. Barmenkov, N. N. Il’ichev, “Reversible photo-darkening and resonant photobleaching of ytterbium-doped silica fiber at in-core 977-nm and 543-nm irradiation,” Laser Phys. Lett. 4(10), 734–739 (2007).
[CrossRef]

Chiasera, A.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Clarkson, W. A.

Crowe, I.

M. N. Zervas, F. Ghiringhelli, M. K. Durkin, I. Crowe, “Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers,” Proc. SPIE 7914, 79140L (2011).
[CrossRef]

Deladurantaye, P.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Desbiens, L.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Drolet, M.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Durkin, M. K.

M. N. Zervas, F. Ghiringhelli, M. K. Durkin, I. Crowe, “Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers,” Proc. SPIE 7914, 79140L (2011).
[CrossRef]

Durrant, T.

Eidam, T.

Engholm, M.

Ermeneux, S.

Faucher, D.

D. Faucher, R. Vallee, “Real-time photobleaching and stable operation at 204 mW of a Tm : ZBLAN blue fiber laser,” IEEE Photon. Technol. Lett. 19(2), 112–114 (2007).
[CrossRef]

Ferrari, M.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Gaumer, N.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Gebavi, H.

Ghiringhelli, F.

M. N. Zervas, F. Ghiringhelli, M. K. Durkin, I. Crowe, “Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers,” Proc. SPIE 7914, 79140L (2011).
[CrossRef]

Guillen, F.

Hammarling, K.

M. Engholm, S. Rydberg, K. Hammarling, “Strong excited state absorption (ESA) in Yb-doped lasers,” Proc. SPIE 8601, 86010P (2013).
[CrossRef]

Hanna, D. C.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

Hoffman, H. J.

Hotoleanu, M.

Il’ichev, N. N.

A. D. G. Chávez, A. V. Kir’yanov, Y. O. Barmenkov, N. N. Il’ichev, “Reversible photo-darkening and resonant photobleaching of ytterbium-doped silica fiber at in-core 977-nm and 543-nm irradiation,” Laser Phys. Lett. 4(10), 734–739 (2007).
[CrossRef]

Jäger, M.

Jansen, F.

Jauregui, C.

Jelger, P.

Jetschke, S.

S. Jetschke, A. Schwuchow, S. Unger, M. Leich, M. Jäger, J. Kirchhof, “Deactivation of Yb3+ ions due to photodarkening,” Opt. Mater. Express 3(4), 452–458 (2013).
[CrossRef]

S. Jetschke, S. Unger, M. Leich, J. Kirchhof, “Photodarkening kinetics as a function of Yb concentration and the role of Al codoping,” Appl. Opt. 51(32), 7758–7764 (2012).
[CrossRef] [PubMed]

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

S. Jetschke, U. Röpke, “Power-law dependence of the photodarkening rate constant on the inversion in Yb doped fibers,” Opt. Lett. 34(1), 109–111 (2009).
[CrossRef] [PubMed]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

S. Jetschke, U. Röpke, S. Unger, J. Kirchhof, “Characterization of photodarkening processes in Yb doped fibers,” Proc. SPIE 7195, 71952B (2009).
[CrossRef]

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express 16(20), 15540–15545 (2008).
[CrossRef] [PubMed]

S. Jetschke, S. Unger, U. Röpke, J. Kirchhof, “Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power,” Opt. Express 15(22), 14838–14843 (2007).
[CrossRef] [PubMed]

Kir’yanov, A. V.

A. D. G. Chávez, A. V. Kir’yanov, Y. O. Barmenkov, N. N. Il’ichev, “Reversible photo-darkening and resonant photobleaching of ytterbium-doped silica fiber at in-core 977-nm and 543-nm irradiation,” Laser Phys. Lett. 4(10), 734–739 (2007).
[CrossRef]

Kirchhof, J.

S. Jetschke, A. Schwuchow, S. Unger, M. Leich, M. Jäger, J. Kirchhof, “Deactivation of Yb3+ ions due to photodarkening,” Opt. Mater. Express 3(4), 452–458 (2013).
[CrossRef]

S. Jetschke, S. Unger, M. Leich, J. Kirchhof, “Photodarkening kinetics as a function of Yb concentration and the role of Al codoping,” Appl. Opt. 51(32), 7758–7764 (2012).
[CrossRef] [PubMed]

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

S. Jetschke, U. Röpke, S. Unger, J. Kirchhof, “Characterization of photodarkening processes in Yb doped fibers,” Proc. SPIE 7195, 71952B (2009).
[CrossRef]

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express 16(20), 15540–15545 (2008).
[CrossRef] [PubMed]

S. Jetschke, S. Unger, U. Röpke, J. Kirchhof, “Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power,” Opt. Express 15(22), 14838–14843 (2007).
[CrossRef] [PubMed]

Kliner, D. A. V.

Koplow, J. P.

Koponen, J.

Koponen, J. J.

Lablonde, L.

Landais, D.

Laperle, P.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Laurell, F.

Le Foulgoc, K.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Le Goffic, O.

Leich, M.

S. Jetschke, A. Schwuchow, S. Unger, M. Leich, M. Jäger, J. Kirchhof, “Deactivation of Yb3+ ions due to photodarkening,” Opt. Mater. Express 3(4), 452–458 (2013).
[CrossRef]

S. Jetschke, S. Unger, M. Leich, J. Kirchhof, “Photodarkening kinetics as a function of Yb concentration and the role of Al codoping,” Appl. Opt. 51(32), 7758–7764 (2012).
[CrossRef] [PubMed]

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express 16(20), 15540–15545 (2008).
[CrossRef] [PubMed]

Limpert, J.

Manek-Hönninger, I.

Mattsson, K. E.

Mechin, D.

Méchin, D.

Messaddeq, Y.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Milanese, D.

Monteil, A.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Monteville, A.

Nilsson, J.

Norin, L.

Obriot, J.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Otto, H. J.

Paschotta, R.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

Payne, D.

Piccoli, R.

Podgorski, M.

Proulx, A.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Reichel, V.

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

Ribeiro, S. J. L.

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

Richardson, D. J.

Robin, T.

Röpke, U.

Rydberg, S.

Sahu, J. K.

Salin, F.

Scheffel, A.

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

Schmidt, O.

Schreiber, T.

Schwuchow, A.

S. Jetschke, A. Schwuchow, S. Unger, M. Leich, M. Jäger, J. Kirchhof, “Deactivation of Yb3+ ions due to photodarkening,” Opt. Mater. Express 3(4), 452–458 (2013).
[CrossRef]

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express 16(20), 15540–15545 (2008).
[CrossRef] [PubMed]

Söderlund, M.

Söderlund, M. J.

Sones, C.

Stutzki, F.

Taccheo, S.

Taillon, Y.

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

Tammela, S. K. T.

Tregoat, D.

Tropper, A. C.

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

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S. Jetschke, A. Schwuchow, S. Unger, M. Leich, M. Jäger, J. Kirchhof, “Deactivation of Yb3+ ions due to photodarkening,” Opt. Mater. Express 3(4), 452–458 (2013).
[CrossRef]

S. Jetschke, S. Unger, M. Leich, J. Kirchhof, “Photodarkening kinetics as a function of Yb concentration and the role of Al codoping,” Appl. Opt. 51(32), 7758–7764 (2012).
[CrossRef] [PubMed]

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

S. Jetschke, U. Röpke, S. Unger, J. Kirchhof, “Characterization of photodarkening processes in Yb doped fibers,” Proc. SPIE 7195, 71952B (2009).
[CrossRef]

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express 16(20), 15540–15545 (2008).
[CrossRef] [PubMed]

S. Jetschke, S. Unger, U. Röpke, J. Kirchhof, “Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power,” Opt. Express 15(22), 14838–14843 (2007).
[CrossRef] [PubMed]

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D. Faucher, R. Vallee, “Real-time photobleaching and stable operation at 204 mW of a Tm : ZBLAN blue fiber laser,” IEEE Photon. Technol. Lett. 19(2), 112–114 (2007).
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Wirth, C.

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Zervas, M. N.

M. N. Zervas, F. Ghiringhelli, M. K. Durkin, I. Crowe, “Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers,” Proc. SPIE 7914, 79140L (2011).
[CrossRef]

Appl. Opt. (2)

IEEE Photon. Technol. Lett. (1)

D. Faucher, R. Vallee, “Real-time photobleaching and stable operation at 204 mW of a Tm : ZBLAN blue fiber laser,” IEEE Photon. Technol. Lett. 19(2), 112–114 (2007).
[CrossRef]

J. Non-Cryst. Solids (1)

A. Monteil, S. Chaussedent, G. Alombert-Goget, N. Gaumer, J. Obriot, S. J. L. Ribeiro, Y. Messaddeq, A. Chiasera, M. Ferrari, “Clustering of rare earth in glasses, aluminum effect: experiments and modeling,” J. Non-Cryst. Solids 348, 44–50 (2004).
[CrossRef]

J. Opt. Soc. Am. B (2)

Laser Phys. Lett. (1)

A. D. G. Chávez, A. V. Kir’yanov, Y. O. Barmenkov, N. N. Il’ichev, “Reversible photo-darkening and resonant photobleaching of ytterbium-doped silica fiber at in-core 977-nm and 543-nm irradiation,” Laser Phys. Lett. 4(10), 734–739 (2007).
[CrossRef]

Opt. Commun. (1)

R. Paschotta, J. Nilsson, P. R. Barber, J. E. Caplen, A. C. Tropper, D. C. Hanna, “Lifetime quenching in Yb-doped fibers,” Opt. Commun. 136(5-6), 375–378 (1997).
[CrossRef]

Opt. Express (10)

J. J. Koponen, M. J. Söderlund, H. J. Hoffman, S. K. T. Tammela, “Measuring photodarkening from single-mode ytterbium doped silica fibers,” Opt. Express 14(24), 11539–11544 (2006).
[CrossRef] [PubMed]

I. Manek-Hönninger, J. Boullet, T. Cardinal, F. Guillen, S. Ermeneux, M. Podgorski, R. Bello Doua, F. Salin, “Photodarkening and photobleaching of an ytterbium-doped silica double-clad LMA fiber,” Opt. Express 15(4), 1606–1611 (2007).
[CrossRef] [PubMed]

S. Jetschke, S. Unger, U. Röpke, J. Kirchhof, “Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power,” Opt. Express 15(22), 14838–14843 (2007).
[CrossRef] [PubMed]

M. Engholm, L. Norin, “Preventing photodarkening in ytterbium-doped high power fiber lasers; correlation to the UV-transparency of the core glass,” Opt. Express 16(2), 1260–1268 (2008).
[CrossRef] [PubMed]

T. Eidam, C. Wirth, C. Jauregui, F. Stutzki, F. Jansen, H. J. Otto, O. Schmidt, T. Schreiber, J. Limpert, A. Tünnermann, “Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers,” Opt. Express 19(14), 13218–13224 (2011).
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S. Taccheo, H. Gebavi, A. Monteville, O. Le Goffic, D. Landais, D. Mechin, D. Tregoat, B. Cadier, T. Robin, D. Milanese, T. Durrant, “Concentration dependence and self-similarity of photodarkening losses induced in Yb-doped fibers by comparable excitation,” Opt. Express 19(20), 19340–19345 (2011).
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K. E. Mattsson, “Photo darkening of rare earth doped silica,” Opt. Express 19(21), 19797–19812 (2011).
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H. Gebavi, S. Taccheo, D. Milanese, A. Monteville, O. Le Goffic, D. Landais, D. Mechin, D. Tregoat, B. Cadier, T. Robin, “Temporal evolution and correlation between cooperative luminescence and photodarkening in ytterbium doped silica fibers,” Opt. Express 19(25), 25077–25083 (2011).
[CrossRef] [PubMed]

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express 16(20), 15540–15545 (2008).
[CrossRef] [PubMed]

S. Rydberg, M. Engholm, “Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers,” Opt. Express 21(6), 6681–6688 (2013).
[CrossRef] [PubMed]

Opt. Lett. (4)

Opt. Mater. Express (2)

Proc. SPIE (6)

M. Engholm, S. Rydberg, K. Hammarling, “Strong excited state absorption (ESA) in Yb-doped lasers,” Proc. SPIE 8601, 86010P (2013).
[CrossRef]

S. Jetschke, U. Röpke, S. Unger, J. Kirchhof, “Characterization of photodarkening processes in Yb doped fibers,” Proc. SPIE 7195, 71952B (2009).
[CrossRef]

P. Laperle, L. Desbiens, K. Le Foulgoc, M. Drolet, P. Deladurantaye, A. Proulx, Y. Taillon, “Modeling the photodegradation of large mode area Yb-doped fiber power amplifiers,” Proc. SPIE 7195, 71952C (2009).
[CrossRef]

M. N. Zervas, F. Ghiringhelli, M. K. Durkin, I. Crowe, “Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers,” Proc. SPIE 7914, 79140L (2011).
[CrossRef]

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, “The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers,” Proc. SPIE 7598, 75980B (2010).
[CrossRef]

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel, “Yb doped silica based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition,” Proc. SPIE 7195, 71950S (2009).
[CrossRef]

Other (1)

R. Piccoli, H. Gebavi, S. Taccheo, L. Lablonde, B. Cadier, T. Robin, A. Monteville, O. Le Goffic, D. Landais, D. Méchin, D. Milanese, T. Brand, “Photodarkening mitigation in Yb-doped fiber lasers by 405 nm irradiation,” Advanced Solid State Lasers (ASSL) AM2A.6 (2013).

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Figures (3)

Fig. 1
Fig. 1

(a) Set-up used to measure ESA cross-section. (b) Set-up used to test bleaching of an operating laser.

Fig. 2
Fig. 2

(a) Measured excited state absorption (ESA) cross-section. A strong absorption from excited state starts for wavelength shorter than 550 nm. (b) Percentage of 1070-nm laser power drop versus active fiber length. Squares and triangles shows percentage of power degradation with and without bleaching radiation injected, respectively.

Fig. 3
Fig. 3

(a) Output laser power Pout,s versus input pump power Pin,p in each equilibrium level: (blue) initial status, (green) 976 nm and 550 nm together, (red) only 976 nm. (b) Laser output power temporal evolution with (green line) and without (red line) bleaching radiation at 550 nm. In all experiments we used a 4.9 cm long active fiber.

Equations (1)

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σ ESA (λ)= ln[ P w,p (λ) P p (λ) P w (λ) ] L Yb N tot N 2

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