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Ueffing, Moritz; Lange, Robert; Pleyer, Tobias; Pervak, Vladimir; Metzger, Thomas; Sutter, Dirk; Major, Zsuzsanna; Nubbemeyer, Thomas; Krausz, Ferenc (2016): Direct regenerative amplification of femtosecond pulses to the multimillijoule level. In: Optics Letters, Vol. 41, No. 16: pp. 3840-3843
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We present a compact femtosecond nonlinear Yb:YAG thin-disk regenerative amplifier delivering pulses carried at a wavelength of 1030 nm with an average power of >200 Wat a repetition rate of 100 kHz and an energy noise value of 0.46% (rms) in a beam with a propagation factor of M-2 < 1.4. The amplifier is seeded with bandwidth-limited subpicosecond pulses without temporal stretching. We give estimates for the nonlinear parameters influencing the system and show that chirped mirrors compress the 2 mJ pulses to a near-bandwidth-limited duration of 210 fs. (C) 2016 Optical Society of America