Abstract

We report on an ytterbium-doped fiber chirped-pulse amplification (CPA) system delivering millijoule level pulse energy at repetition rates above 100kHz corresponding to an average power of more than 100W. The compressed pulses are as short as 800fs. As the main amplifier, an 80μm core diameter short length photonic crystal fiber is employed, which allows the generation of pulse energies up to 1.45mJ with a B-integral as low as 7 at a stretched pulse duration of 2ns. A stretcher–compressor unit consisting of dielectric diffraction gratings is capable of handling the average power without beam and pulse quality distortions. To our knowledge, we present the highest pulse energy ever extracted from fiber based femtosecond laser systems, and a nearly 2 orders of magnitude higher repetition rate than in previously published millijoule-level fiber CPA systems.

© 2007 Optical Society of America

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