Abstract
We present an improved multipass amplifier design, enabling the amplification of ultrashort pulses with excellent beam quality to more than 1 kW of average output power. 260 fs short pulses at an average power of 105 W and a repetition rate of 1 MHz were directly amplified up to an average power of 1033 W. The pulse duration at this power level was measured to be 388 fs assuming a Gaussian temporal shape. This corresponds to a peak power of 2.5 GW. The power stability was measured to be 0.16% RMS over a duration of more than two hours at a sampling rate of 2 Hz. High beam quality is proven with measured values of $\textrm{M}_\textrm{x}^\textrm{2}\textrm{ = 1}\textrm{.16}$ in the horizontal and $\textrm{M}_\textrm{y}^\textrm{2}\textrm{ = 1}\textrm{.19}$ in the vertical plane according to ISO Standard 11146.
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11 April 2022: A typographical correction was made to the body text.
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