Abstract
By means of a diffraction limited pump source delivering 40 W at 976 nm, we demonstrate a broadband booster amplifier operating at 96 MHz based on a 29 mm Yb:CaF2 crystal. Without any stretching, pulses as short as 70 fs have been amplified up to 16.5 W in a single-pass configuration corresponding to an optical efficiently of 34 % and an optical gain of 5.7.
© 2015 Optical Society of America
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