Abstract
A photonic-crystal fibre filled with krypton gas has been used to realize an extreme-ultraviolet source with a megahertz repetition rate. Applications such as photoelectron spectroscopy and coherent diffractive imaging ideally require extreme-ultraviolet sources with a high photon flux and a high repetition rate, but achieving both properties simultaneously is challenging. Now, scientists in Jena, Germany, have solved this problem by using a krypton-filled kagome fibre to nonlinearly compress laser pulses at a rate of 10.7 megahertz. They then used the rapid stream of compressed pulses to drive high-harmonic generation in a gas jet. This resulted in the generation of over 50 microwatts at a photon energy of 27.7 electron volts. The approach could lead to a new breed of more compact and efficient high-harmonic-generation sources.
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