Abstract

Based on numerical modeling, the dynamic characteristics of high-power ytterbium-doped double-clad fiber amplifiers during the amplification of nanosecond pulses with kilohertz repetition rates are comprehensively analyzed. The temporal pulse energy, power, upper-level population distribution, amplified spontaneous emission, stored energy, pulse waveform evolution, etc., are emphasized in this paper. Some practical issues in amplification processes, such as the impacts of reflected pulses from the external surfaces and the fluctuation of input pulse energy on the amplifier performance, are also discussed. The models and results are important for the design and development of high-power double-clad fiber amplifiers.

© 2003 IEEE

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J. Lightwave Technol.

L. Zenteno, "High-power double-clad fiber lasers", J. Lightwave Technol., vol. 11, pp. 1435-1446, Sept. 1993 .

C. R. Giles and E. Desurvire, "Modeling erbium-doped fiber amplifiers", J. Lightwave Technol., vol. 9, pp. 271-283, 1991.

A. A. Hardy and R. Oron, "Amplified spontaneous emission and Rayleigh backscattering in strongly pumped fiber amplifiers", J. Lightwave Technol., vol. 16, pp. 1865-1873, Oct. 1998.

Opt. Lett.

Other

J. Nilsson, P. Scheer and B. Jaskorzynska, "Modeling and optimization of short Yb3+-sensitized Er-doped fiber amplifiers", IEEE Photon. Technol. Lett., vol. 6, pp. 383-385, Mar. 1994.

A. A. Hardy and R. Oron, "Signal amplification in strongly pumped fiber amplifiers", IEEE J. Quantum Electron., vol. 33, pp. 307-313, Mar. 1997 .

V. Gapontsev, V. V. Fomin, I. E. Samartsev and A. Unt, "25 kW peak power, wide-tunable-repetition-rate and pulse duration eye-safe MOPFA laser", in Proc. Conf. Lasers Electro-Optics, CLEO '96, 1996, pp. 209-210.

J. Limpert, A. Liem, H. Zellmer, A. Tunnermann, S. Knoke and H. Voelckel, "High-average-power millijoule fiber amplifier system", in Proc. Conf. Lasers Electro-Optics, CLEO '02, vol. 1, 2002, pp. 591-592.

F. D. Teodoro, J. P. Koplow, S. W. Moore and D. A. V. Kliner, "Diffraction-limited, 300-kW-peak-power pulses from a Yb-doped fiber amplifier", in Proc. Conf. Lasers Electro-Optics, CLEO '02, vol. 1, 2002, pp. 592-593.

L. M. Frantz and J. S. Nodvik, "Theory of pulse propagation in a laser amplifier", J. Appl. Phys., vol. 34, pp. 2346-2349, 1963.

R. Paschotta, J. Nilsson, A. C. Tropper and D. C. Hanna, "Ytterbium-doped fiber amplifiers", IEEE J. Quantum Electron., vol. 33, pp. 1049-1056, July 1997 .

P. C. Becker, N. A. Olsson and J. R. Simpson, Erbium-Doped Fiber Amplifiers, Fundamentals and Technology , New York: Academic, 1999.

R. Oron and A. A. Hardy, "Rayleigh backscattering and amplified spontaneous emission in high-power ytterbium-doped fiber amplifiers", J. Opt. Soc. Amer. B, vol. 16, pp. 695-701, 1999.

M. N. Zervas and R. I. Laming, "Rayleigh scattering effect on the gain efficiency and noise of erbium-doped fiber amplifiers", IEEE J. Quantum Electron., vol. 31, pp. 468-471, Mar. 1995.

R. D. Skeel and M. Berzins, "A method for the spatial discretization of parabolic equations in one space variable", SIAM J. Scientific Statistical Computing , vol. 11, pp. 1-32, 1990.

J. W. Thomas, Numerical Partial Differential Equations: Finite Difference Methods , New York: Springer-Verlag, 1995 .

C. C. Renaud, H. L. Offerhaus, J. A. Alvarez-Chavez, J. Nilsson, W. A. Clarkson, P. W. Turner, D. J. Richardson and A. B. Grudinin, "Characteristics of Q -switched cladding pumped ytterbium-doped fiber lasers with different high-energy fiber designs", IEEE J. Quantum Electron., vol. 37, pp. 199-206, Feb. 2001.

G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. San Diego, CA: Academic, 1995.

J. M. Sousa, J. Nilsson, C. C. Renaud, J. A. Alvarez-Chavez, A. B. Grudinin and J. D. Minelly, "Broad-band diode-pumped ytterbium-doped fiber amplifier with 34-dBm output power", IEEE Photon. Technol. Lett., vol. 11, pp. 39-41, Jan. 1999.

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