Abstract
We demonstrate the generation of XUV radiation with wavelengths down to 23.9 nm (52 eV) at 50 kHz via high harmonic generation of a fiber chirped pulse amplification system. At repetition rates of 100 kHz and 200 kHz we were able to obtain 27.8 nm (45 eV) and 35.5 nm (35 eV), respectively. Furthermore, we show latest experimental results on post compression of the same fiber chirped pulse amplification system via self-phase modulation in hollow core fibers pathing the way towards more efficient high harmonic generation with even shorter wavelengths. Pulses as short as 70 fs with 200 μJ pulse energy at 50 kHz and with 77 fs have been obtained owing a peak power of 2 GW.
© 2010 Optical Society of America
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