Abstract

We demonstrate the generation of 0.85 PW, 30 fs laser pulses at a repetition rate of 3.3 Hz with a record average power of 85 W from a Ti:sapphire laser. The system is pumped by high-energy Nd:glass slab amplifiers frequency doubled in ${\mathrm{LiB}}_3{\text{O}}_5$ (LBO). Ultrahigh-contrast $\lambda =400\mathrm{nm}$ femtosecond pulses were generated in ${\mathrm{KH}}_2{\mathrm{PO}}_4$ (KDP) with $>40\%$ efficiency. An intensity of $6.5\times {10}^{21}\mathrm{W}/{\mathrm{cm}}^2$ was obtained by frequency doubling 80% of the available Ti:sapphire energy and focusing the doubled light with an $f/2$ parabola. This laser will enable highly relativistic plasma experiments to be conducted at high repetition rate.

© 2017 Optical Society of America

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