Abstract

We report on fundamental mode content measurements performed on single-frequency large mode area fiber amplifiers based on Er:Yb-codoped multifilament-core (MFC) and step-index pedestal-design fibers. The mode content of the amplifier output was analyzed with respect to free-space TEM modes using a nonconfocal scanning ring cavity. At power levels of several watts, the commercial step-index pedestal-design fibers with respective core diameters of 23 and 25 μm showed a TEM<sub>00</sub> mode content exceeding 80%. However, a TEM<sub>00</sub> mode content of up to 95% could be obtained with an MFC fiber also with larger core diameter of 31/28 μm in hexagonal shape. To the best of our knowledge, we utilized the nonconfocal scanning ring cavity technique for the first time in the wavelength region of 1.5 μm and additionally for the first time on fibers with pedestal as well as MFC design.

© 2010 IEEE

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M. Punturo, "The third generation of gravitational wave observatories and their science reach," Class. Quantum Grav. 27, 084007-1-084007-23 (2010).

G. Canat, R. Spittel, S. Jetschke, L. Lombard, P. Bourdon, "Analysis of the multifilament core fiber using the effective index theory," Opt. Exp. 18, 4644-4654 (2010).

2009 (1)

2008 (2)

S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, A. Scheffel, J. Kirchhof, "Optical properties of Yb-doped laser fibers in dependence on codopants and preparation conditions," Proc. SPIE 6890, 6890016 (2008).

G. Canat, S. Jetschke, S. Unger, L. Lombard, P. Bourdon, J. Kirchhof, V. Jolivet, A. Dolfi, O. Vasseur, "Multifilament-core fibers for high energy pulse amplification at 1.5 $\mu$m with excellent beam quality," Opt. Lett. 33, 2701-2703 (2008).

2007 (3)

U. Röpke, H. Bartelt, S. Unger, K. Schuster, J. Kobelke, "Two-dimensional high-precision fiber waveguide arrays for coherent light propagation," Opt. Exp. 15, 6894-6899 (2007).

S. Wielandy, "Implications of higher-order mode content in large mode area fibers with good beam quality," Opt. Exp. 15, 15402-15409 (2007).

P. Kwee, F. Seifert, B. Willke, K. Danzmann, "Laser beam quality and pointing measurement with an optical resonator," Rev. Sci. Instrum. 78, 073103-1-073103-10 (2007).

2006 (1)

M. Hildebrandt, M. Frede, P. Kwee, B. Willke, D. Kracht, "Single-frequency master-oscillator photonic crystal fiber amplifier with 148 W output power," Opt. Exp. 14, 11071-11076 (2006).

2005 (1)

2004 (1)

J. Limpert, A. Liem, M. Reich, T. Schreiber, S. Nolte, H. Zellmer, A. Tünnermann, J. Broeng, A. Petersson, C. Jakobsen, "Low-nonlinearity single-transverse-mode ytterbium-doped photonic crystal fiber amplifier," Opt. Exp. 12, 1313-1319 (2004).

2003 (1)

P. Weßels, C. Fallnich, "Highly sensitive beam quality measurements on large mode area fiber amplifiers," Opt. Exp. 11, 3346-3351 (2003).

2001 (1)

P. K. Cheo, A. Liu, G. G. King, "A high-brightness laser beam from a phase-locked multicore Yb-doped fiber laser array," IEEE Photon. Technol. Lett. 13, 439-441 (2001).

2000 (1)

R. Scarmozzino, A. Gopinath, R. Pregla, S. Helfert, "Numerical techniques for modeling guided-wave photonic devices," IEEE J. Sel. Top. Quantum Electron. 6, 150-162 (2000).

1998 (1)

Class. Quantum Grav. (1)

M. Punturo, "The third generation of gravitational wave observatories and their science reach," Class. Quantum Grav. 27, 084007-1-084007-23 (2010).

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

R. Scarmozzino, A. Gopinath, R. Pregla, S. Helfert, "Numerical techniques for modeling guided-wave photonic devices," IEEE J. Sel. Top. Quantum Electron. 6, 150-162 (2000).

IEEE Photon. Technol. Lett. (1)

P. K. Cheo, A. Liu, G. G. King, "A high-brightness laser beam from a phase-locked multicore Yb-doped fiber laser array," IEEE Photon. Technol. Lett. 13, 439-441 (2001).

Opt. Exp. (6)

U. Röpke, H. Bartelt, S. Unger, K. Schuster, J. Kobelke, "Two-dimensional high-precision fiber waveguide arrays for coherent light propagation," Opt. Exp. 15, 6894-6899 (2007).

P. Weßels, C. Fallnich, "Highly sensitive beam quality measurements on large mode area fiber amplifiers," Opt. Exp. 11, 3346-3351 (2003).

J. Limpert, A. Liem, M. Reich, T. Schreiber, S. Nolte, H. Zellmer, A. Tünnermann, J. Broeng, A. Petersson, C. Jakobsen, "Low-nonlinearity single-transverse-mode ytterbium-doped photonic crystal fiber amplifier," Opt. Exp. 12, 1313-1319 (2004).

M. Hildebrandt, M. Frede, P. Kwee, B. Willke, D. Kracht, "Single-frequency master-oscillator photonic crystal fiber amplifier with 148 W output power," Opt. Exp. 14, 11071-11076 (2006).

G. Canat, R. Spittel, S. Jetschke, L. Lombard, P. Bourdon, "Analysis of the multifilament core fiber using the effective index theory," Opt. Exp. 18, 4644-4654 (2010).

S. Wielandy, "Implications of higher-order mode content in large mode area fibers with good beam quality," Opt. Exp. 15, 15402-15409 (2007).

Opt. Lett. (4)

Proc. SPIE (1)

S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, A. Scheffel, J. Kirchhof, "Optical properties of Yb-doped laser fibers in dependence on codopants and preparation conditions," Proc. SPIE 6890, 6890016 (2008).

Rev. Sci. Instrum. (1)

P. Kwee, F. Seifert, B. Willke, K. Danzmann, "Laser beam quality and pointing measurement with an optical resonator," Rev. Sci. Instrum. 78, 073103-1-073103-10 (2007).

Other (3)

J. Nicholson, J. Jasapara, A. Desantolo, E. Monberg, F. Dimarcello, "Characterizing the modes of a core-pumped, large mode area Er fiber using spatially and spectrally resolved imaging," Proc. Lasers and Electro-Optics/Int. Quantum Electron. Conf. (2009) pp. 1-2.

C. A. Codemard, J. Nilsson, J. K. Sahu, "Tandem pumping of large-core double-clad ytterbium-doped fiber for control of excess gain," Proc. Advanced Solid-State Photon. (2010).

K. Tankala, B. Samson, A. Carter, J. Farroni, D. Machewirth, N. Jacobson, U. Manyam, A. Sanchez, M.-Y. Cheng, A. Galvanauskas, W. Torruellas, Y. Chen, "New developments in high power eye-safe LMA fibers," Proc. SPIE (2006) pp. 610206.

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