High-harmonic generation in solids could be a valuable approach for high repetition rate nano-scale integrated coherent light sources in the extreme-ultraviolet spectral range. Furthermore, the solid state nature of the generation medium allows the possibility to tailor directly the radiation at the source of the emission. It offers a substantial degree of freedom for the spatial beam shaping. In this project, we examine HHG in solids carrying an orbital angular momentum (OAM). We demonstrate the transfer and the conservation of the orbital angular momentum from the generation laser to the harmonics generated focused optical vortices with nanometer sizes.
