Femtosecond pulse amplification in a cladding-pumped fiber amplifier is demonstrated for the first time to our knowledge. Using a cladding-pumped erbium-doped fiber power amplifier and a passively mode-locked fiber seed oscillator in conjunction with an all-fiber chirped-pulse amplification system, we obtain 380-fs near-bandwidth-limited pulses with an average power of 260 mW. The pulse repetition rate is varied between 5 and 50 MHz, and pulse energies as high as 20 nJ are generated.
© 1995 Optical Society of America
J. D. Minelly, A. Galvanauskas, M. E. Fermann, D. Harter, J. E. Caplen, Z. J. Chen, and D. N. Payne, "Femtosecond pulse amplification in cladding-pumped fibers," Opt. Lett. 20, 1797-1799 (1995)