[1] Goldberg L, Koplow J P, Moeller R P, et al. High-power superfluorescent source with a side-pumped Yb-doped double-cladding fiber[J]. Opt Lett,1998, 23(13):1037-1039.

[2] Goldberg L, Koplow J P, Kliner D A V, et al. Highly efficient 4 W Yb-doped fiber amplifier pumped by a broad-stripe laser diode[J]. Opt Lett,1999, 24(10):673-675.

[3] Ortac B, Hideur A, Chartier T, et al. 90 fs stretched-pulse ytterbium-doped double-clad fiber laser[J]. Opt Lett, 2003, 28(15):1305-1307.

[4] Strickland D, Mourou G. Compression of amplified chirped optical pulses[J]. Opt Commun, 1985, 56(3):219-221.

[5] Minelly J D, Galvanauskas A, Fermanm M E, et al. Femtosecond pulse amplification in cladding-pumped fibers[J]. Opt Lett, 1995, 20(17):1797-1799.

[6] Fermanm M E, Galvanauskas A, Stock M L, et al. Ultrawide tunable Er soliton fiber laser amplified in Yb-doped fiber[J]. Opt Lett, 1999, 24(20):1428-1430.

[7] Liem A, Nickel D, Limpert J, et al. High average power ultra-fast fiber chirped pulse amplification system[J]. Appl Phys B, 2000, 71:889-891.

[8] Cho G C, Galvanauskas A, Femann M E,et al. 100 μJ and 5.5 W Yb-fiber femtosecond chirped pulse amplifier system[A]. Conference on Lasers and Electro-Optics[C]. San Francisco, California, 2000. paper CMW2.

[9] Limpert J, Liem A, Gabler T, et al. High-average-power picosecond Yb-doped fiber amplifier[J]. Opt Lett, 2001, 26(23):1849-1851.

[10] Limpert J, Schreiber T, Clausnitzer T, et al. High-power femtosecond Yb-doped fiber amplifier[J]. Opt Express, 2002, 10(14):628-638.

[11] Limpert J, Clausnitzer T, Liem A, et al. High-average-power femtosecond fiber chirped-pulse amplification system[J]. Opt Lett, 2003, 28(20):1984-1986.

[12] Limpert J, Schreiber T, Nolte S, et al. All fiber chirped-pulse amplification system based on compression in aer-guiding photonic bandgap fiber[J]. Opt Express, 2003,11(24):3332-3337.