Abstract

A current limit in power scaling of Yb-doped fiber amplifiers is the sudden onset of mode instabilities. We investigated this effect on a single-frequency Yb-doped photonic crystal fiber amplifier with a low mode instability threshold power. By measuring the overlap of the fiber output beam with the fundamental mode of an external cavity to be about 95%, we could exclude significant modal power transfer below a sharp power threshold. Furthermore, we directly measured the frequency resolved intensity noise spectra. No fluctuations in the overall output power were observed, but for the modal content different oscillation regimes were identified.

© 2012 Optical Society of America

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References

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2012

2011

2007

P. Kwee, F. Seifert, B. Willke, and K. Danzmann, Rev. Sci. Instrum. 78, 073103 (2007).
[CrossRef]

S. Wielandy, Opt. Express 15, 15402 (2007).
[CrossRef]

1998

Alkesjold, T.

Arkwright, J. W.

Atkins, G. R.

Basu, C.

Broeng, J.

Dajani, I.

Danzmann, K.

P. Kwee, F. Seifert, B. Willke, and K. Danzmann, Rev. Sci. Instrum. 78, 073103 (2007).
[CrossRef]

Davis, M. K.

Digonnet, M. F.

Digonnet, M. J. F.

Eidam, T.

Elango, P.

Hansen, K. R.

Jansen, F.

Jauregui, C.

Jørgensen, M.

Karow, M.

Kracht, D.

Kwee, P.

P. Kwee, F. Seifert, B. Willke, and K. Danzmann, Rev. Sci. Instrum. 78, 073103 (2007).
[CrossRef]

Lægsgaard, J.

Laurila, M.

Limpert, J.

Neumann, J.

Otto, H.-J.

Pantell, R. H.

Robin, C.

Schmidt, O.

Schreiber, T.

Seifert, F.

P. Kwee, F. Seifert, B. Willke, and K. Danzmann, Rev. Sci. Instrum. 78, 073103 (2007).
[CrossRef]

Smith, A. V.

Smith, J. J.

Stutzki, F.

Tünnermann, A.

Tünnermann, H.

Ward, B.

Weßels, P.

Whitebread, T.

Wielandy, S.

Willke, B.

P. Kwee, F. Seifert, B. Willke, and K. Danzmann, Rev. Sci. Instrum. 78, 073103 (2007).
[CrossRef]

Wirth, C.

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Figures (3)

Fig. 1.
Fig. 1.

Representative snapshots of the fluctuating beam profile at the threshold power. It permanently changed from an LP01-like mode (a) through intermediate states (b), (c) to an LP11-like mode and (d) back in a chaotic manner.

Fig. 2.
Fig. 2.

Experimental setup for the measurement of the frequency resolved intensity noise spectra. BS, beam sampler and HR, highly reflective mirror.

Fig. 3.
Fig. 3.

RIN spectra of the amplifier at different levels of absorbed pump power.

Tables (1)

Tables Icon

Table 1. Parameters of the Yb-Doped PCF

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