Abstract

We demonstrate, theoretically and experimentally, a high power/energy 19-core Yb-doped fiber amplifier that operates in its fundamental in-phase mode. The calculated result using an improved coupled mode theory with gain shows that, with a Gaussian beam as seed, the in-phase supermode dominates. Experimentally, we use a Q-switched single-core fiber laser with single transverse mode as seed, and amplify it with a 5.8 m 19-core fiber. The measured near and far fields are close to the in-phase supermode. The measured M2 factor of the amplified beam is 1.5, which is close to the theoretical value. A pulse energy gain of 20 dB is obtained with the amplified pulse energy up to 0.65 mJ at a repetition frequency of 5 kHz. No appreciable stimulated Brillouin scattering is observed at this power level.

© 2004 Optical Society of America

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References

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  2. C. C. Renaud, H. L. Offerhaus, J. A. Alvarez-Chavez, J. Nilsson, W. A. Clarkson, P. W. Turner, and D. J. Richardson, ???Characteristics of Q-Switched Cladding-Pumped Ytterbium-Doped Fiber Lasers with Different High-Energy Fiber Designs,??? IEEE J. Quantum Electron. 37, 199-206 (2001).
    [CrossRef]
  3. C. Avila,R. Burham, Y. Chen, W. Torruellas, H. Verdun, and R. Utano, ???Polarization maintaining master oscillator fiber amplifier (MOFA) for high repetition rate applications,??? SPIE Proc. 5335, 24-32 (2004).
  4. P. K. Cheo, ???Clad-pumped, eye-safe and multi-core phase-locked fiber lasers,??? US Patent 6 031 850, Feb. 29, 2000.
  5. P. K. Cheo, A. Liu, and G. G. King, ???A high-brightness laser beam from a phase-locked multicore Yb-doped fiber laser array,??? IEEE Photon. Technol. Lett. 13, 439-41 (2001).
    [CrossRef]
  6. Y. Huo, G. G. King, and P.K. Cheo, ???Second Harmonic Generation using a High-Energy and Tunable Q-switched Multicore Fiber Laser,??? IEEE Photon. Technol. Lett. 16, 2224-2226 (2004).
    [CrossRef]
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IEEE J. Quantum Electron. (1)

C. C. Renaud, H. L. Offerhaus, J. A. Alvarez-Chavez, J. Nilsson, W. A. Clarkson, P. W. Turner, and D. J. Richardson, ???Characteristics of Q-Switched Cladding-Pumped Ytterbium-Doped Fiber Lasers with Different High-Energy Fiber Designs,??? IEEE J. Quantum Electron. 37, 199-206 (2001).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

P. K. Cheo, A. Liu, and G. G. King, ???A high-brightness laser beam from a phase-locked multicore Yb-doped fiber laser array,??? IEEE Photon. Technol. Lett. 13, 439-41 (2001).
[CrossRef]

Y. Huo, G. G. King, and P.K. Cheo, ???Second Harmonic Generation using a High-Energy and Tunable Q-switched Multicore Fiber Laser,??? IEEE Photon. Technol. Lett. 16, 2224-2226 (2004).
[CrossRef]

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

Opt. Lett. (3)

Proc. SPIE (1)

A. E. Siegman, ???New developments in laser resonators,??? Proc. SPIE 1224, 2-14 (1990).

SPIE Proc. (1)

C. Avila,R. Burham, Y. Chen, W. Torruellas, H. Verdun, and R. Utano, ???Polarization maintaining master oscillator fiber amplifier (MOFA) for high repetition rate applications,??? SPIE Proc. 5335, 24-32 (2004).

SSDLTR (1)

C-H Liu, A. Galvanauskas, B. Ehlers, and S. Heinemann, ???KW-power fiber laser with single-transverse mode output using standard 20-m core Yb-doped DC fibers,??? SSDLTR 2004 Technical Digest, paper Fiber-5.

Other (3)

P. K. Cheo, ???Clad-pumped, eye-safe and multi-core phase-locked fiber lasers,??? US Patent 6 031 850, Feb. 29, 2000.

G.P. Agrawal, Nonlinear fiber optics, 2nd Ed. (Academic Press, 1995).

G.G. King and P.K. Cheo, ???Side pumping of optical fiber systems via multiple delivery fibers,??? US Patent #6,766,075 B1 (2004).

Supplementary Material (1)

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