Abstract

While being the most precise measurement tool in physics, high precision laser spectroscopy is still limited to wavelengths in the range between the infrared and the near ultraviolet. The generation of XUV frequency combs might be a route to extend optical frequency metrology into extreme ultraviolet (XUV) spectral region where many elements have fundamental transitions. The method of choice for XUV frequency comb generation has been cavity-assisted high harmonic generation, where an infrared frequency comb is converted into the XUV inside a femtosecond enhancement cavity at the full repetition rate of the oscillator. Our recent efforts have been directed towards a significant improvement of the average power of XUV combs. To this end, we experimentally investigated the process of non-collinear high harmonic generation (NCHHG) and proved it to be useful as a combined method for efficient generation and outcoupling of XUV radiation. Also, we developed a high repetition rate single-pass amplifier which has the potential to boost the available power for intracavity HHG.

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