The development and the construction of X-ray free electron lasers (XFELs) has allowed the implementation of an entirely novel class of experiments. Among these, non-linear X-ray studies are becoming possible thanks to the high flux and extremely short durations of X-ray pulses from XFELs. Methods such as four-wave mixing, transient gratings, stimulated Raman, multiphoton absorption, etc. have recently been demonstrated.

Upcoming WavemiX2024 – NEXT Annual Meeting webpage,8-12 July 2024 IMDEA nanociencia – Madrid – Spain --> https://nanociencia.imdea.org/wavemix2024/

The upcoming WavemiX (“Wave mixing in the EUV and X-ray”) annual workshop will be a meeting of the newly launched COST Action CA22148 (https://www.cost.eu/actions/CA22148/) , An international network for Non-linear Extreme Ultraviolet to hard X-ray techniques (NEXT – https://ca-next.eu/). The main goal of NEXT is to promote the development and application of advanced non-linear extreme ultraviolet (EUV) to X-ray spectroscopic and imaging techniques, enabled by Free Electron Laser (FEL) facilities and lab-based High-order Harmonic Generation (HHG) sources.

It is in this context that the WavemiX (Wave mixing in the X-ray) network was created. Its goal is to bring together the community of scientists working on the development of novel non-linear X-ray optical and spectroscopic methods and experiments, as they share common theoretical and technical challenges. This synergy and sharing of expertise and know-how is of high importance in order to foster the implementation of new tools based on the above methods.

WavemiX currently counts several members coming from more than 50 research institutes located around the world.