Abstract

We report a diode-pumped Yb:KYW amplifier delivering up to $27\mathrm{mJ}$ pulses at a repetition rate of $100\mathrm{Hz}$ and a spectral bandwidth of $5.5\mathrm{nm}$, centered at around $1030\mathrm{nm}$. The system is based on a double-head multipass amplifier configuration where the pump thermal load is distributed over two relatively thin laser crystals, which permits a sufficiently large number of passes with minimal passive losses, thus maximizing the energy extraction efficiency. The amplified pulse bandwidth theoretically supports $340\mathrm{fs}$ pulses, and as a demonstration, a small fraction of the amplified pulses has been compressed to $560\mathrm{fs}$.

© 2011 Optical Society of America

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