Abstract
We report on results from the fully diode-pumped chirped-pulse amplification laser system Polaris. Pulses were amplified to a maximum energy of 54.2J before compression. These pulses have a full width at half-maximum spectral bandwidth of 18nm centered at 1033nm and are generated at a repetition rate of 0.02Hz. To the best of our knowledge, these are the most energetic broadband laser pulses generated by a diode-pumped laser system so far. Due to the limited size of our vacuum compressor, only attenuated pulses could be compressed to a duration of 98fs containing an energy of 16.7J, which leads to a peak power of 170TW. These pulses could be focused to a peak intensity of 1.3×10<sup>21</sup> W/cm<sup>2</sup>. Having an ultra-high temporal contrast of 10<sup>12</sup> with respect to amplified spontaneous emission these laser pulses are well suited for high-intensity laser-matter experiments.
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