Cladding-pumped fiber exhibits femtosecond pulse amplification

Oct. 1, 1995
Researchers from IMRA America (Ann Arbor, MI) and the University of Southhampton (Southhampton, England) have demonstrated that high power levels generated with cladding-pumped fiber lasers can be obtained in the femtosecond-pulse range by employing chirped-pulse amplification.gifrbium served as the sole gain medium in a singly doped double-clad fiber. Previous research on cladding pumping used ytterbium codoping in the fibers, which limited femtosecond performance due to the narrow bandwidths i

Cladding-pumped fiber exhibits femtosecond pulse amplification

Researchers from IMRA America (Ann Arbor, MI) and the University of Southhampton (Southhampton, England) have demonstrated that high power levels generated with cladding-pumped fiber lasers can be obtained in the femtosecond-pulse range by employing chirped-pulse amplification.gifrbium served as the sole gain medium in a singly doped double-clad fiber. Previous research on cladding pumping used ytterbium codoping in the fibers, which limited femtosecond performance due to the narrow bandwidths induced by a large phosphate content. The single-doped fibers are phosphate free, and, by eliminating the codopant, pumping efficiency increases.

The power amplifier was pumped with two polarization-multiplexed master oscillator-power amplifier (MOPA) 980-nm diode lasers delivering 1.75 W, with nearly 1.15 W launched into the power amplifier. The power amplifier and a passively modelocked fiber seed oscillator, based on a Kerr-modelocked fiber laser, in conjunction with an all-fiber chirped-pulse amplification system permitted obtaining 380-fs nearly bandwidth-limited pulses with an average power of 260 mW.

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