Abstract
High-repetition-rate high-harmonic sources are desired for novel attosecond and time-resolved spectroscopies. One route to generating these sources is the nonlinear compression of high-average power Yb fiber and solid-state amplifiers, which can achieve >100 fs pulse duration with microjoule to millijoule pulse energy. Here, we demonstrate compression of 280 fs, 400 μJ pulses from a moderately high power (20 W) Yb:KGW laser amplifier to 15 fs. Few-cycle pulses (<5 cycles) with an energy of up to 200 μJ are obtained with a relatively simple scheme utilizing a xenon-filled hollow-core fiber and chirped mirror compressor and are used to generate XUV harmonics.
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