Abstract

A high-speed mode analysis technique is required to gain fundamental understanding of mode instabilities in high-power fiber laser systems. In this work a technique, purely based on the intensity profile of the beam, is demonstrated to be ideally suited to analyze fiber laser dynamics. This technique, together with a high-speed camera, has been applied to the study of the temporal dynamics of mode instabilities at high average powers with up to 20,000 frames per second. These measurements confirm that energy transfer between the fluctuating transversal modes takes place in millisecond-time-scale.

© 2011 Optical Society of America

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[CrossRef] [PubMed]

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[CrossRef] [PubMed]

C. Jauregui, T. Eidam, H.-J. Otto, F. Stutzki, F. Jansen, J. Limpert, and A. Tünnermann, “Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems,” Opt. Express submitted.
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[CrossRef] [PubMed]

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[CrossRef] [PubMed]

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F. Stutzki, F. Jansen, T. Eidam, A. Steinmetz, C. Jauregui, J. Limpert, and A. Tünnermann, Opt. Lett. 36, 689 (2011).
[CrossRef] [PubMed]

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[CrossRef] [PubMed]

F. Stutzki, C. Jauregui, J. Limpert, and A. Tünnermann, Electron. Lett. 47 (4), pp. 274 (2011).
[CrossRef]

C. Jauregui, T. Eidam, H.-J. Otto, F. Stutzki, F. Jansen, J. Limpert, and A. Tünnermann, “Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems,” Opt. Express submitted.
[PubMed]

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N. Andermahr, T. Theeg, and C. Fallnich, Appl. Phys. B 91, 353 (2008).
[CrossRef]

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F. Stutzki, C. Jauregui, J. Limpert, and A. Tünnermann, Electron. Lett. 47 (4), pp. 274 (2011).
[CrossRef]

T. Eidam, C. Wirth, C. Jauregui, F. Stutzki, F. Jansen, H.-J. Otto, O. Schmidt, T. Schreiber, J. Limpert, and A. Tünnermann, Opt. Express 19, 13218 (2011).
[CrossRef] [PubMed]

C. Jauregui, T. Eidam, J. Limpert, and A. Tünnermann, Opt. Express 19, 3258 (2011).
[CrossRef] [PubMed]

F. Stutzki, F. Jansen, T. Eidam, A. Steinmetz, C. Jauregui, J. Limpert, and A. Tünnermann, Opt. Lett. 36, 689 (2011).
[CrossRef] [PubMed]

C. Jauregui, T. Eidam, H.-J. Otto, F. Stutzki, F. Jansen, J. Limpert, and A. Tünnermann, “Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems,” Opt. Express submitted.
[PubMed]

Wirth, C.

Wright, M. H.

J. C. Lagarias, J. A. Reeds, M. H. Wright, and P. E. Wright, SIAM J. Optim. 9 (1), 112 (1998).
[CrossRef]

Wright, P. E.

J. C. Lagarias, J. A. Reeds, M. H. Wright, and P. E. Wright, SIAM J. Optim. 9 (1), 112 (1998).
[CrossRef]

Yablon, A. D.

Appl. Phys. B (1)

N. Andermahr, T. Theeg, and C. Fallnich, Appl. Phys. B 91, 353 (2008).
[CrossRef]

Electron. Lett. (1)

F. Stutzki, C. Jauregui, J. Limpert, and A. Tünnermann, Electron. Lett. 47 (4), pp. 274 (2011).
[CrossRef]

J. Opt. Soc. Am. A (1)

J. Opt. Soc. Am. B (1)

Opt. Express (6)

Opt. Lett. (2)

Phys. Rev. Lett. (1)

O. Shapira, A. F. Abouraddy, J. D. Joannopoulos, and Y. Fink, Phys. Rev. Lett. 94, 143902 (2005).
[CrossRef] [PubMed]

SIAM J. Optim. (1)

J. C. Lagarias, J. A. Reeds, M. H. Wright, and P. E. Wright, SIAM J. Optim. 9 (1), 112 (1998).
[CrossRef]

Supplementary Material (1)

» Media 1: MOV (1761 KB)     

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Figures (2)

Fig. 1
Fig. 1

Measured near-field images, reconstructed intensity pattern, and residual intensity for different times, all graphs are scaled to the same maximum. The images are all taken above the mode instability threshold at an average output power of 290 W .

Fig. 2
Fig. 2

Fundamental mode (solid black) and higher order mode (dotted red) power content of the reconstructed field above the mode instability threshold for a time period of 10 ms (same period as in Media 1). Additionally, the residual power content as a fraction of the measured beam power is depicted in gray.

Tables (1)

Tables Icon

Table 1 Fiber and Experimental Parameters

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