Description
Transient grating spectroscopy is a versatile tool for investigating ultrafast and nanoscale phenomena, although its spatial resolution is generally constrained by optical wavelengths. Here, we report the design and realization of a proof-of-concept transient grating experiment driven by extreme-ultraviolet radiation produced via high-harmonic generation, providing a compact alternative to free-electron-laser-based implementations. Employing a 59 nm pump and a 410 nm probe, the system allows for tunable grating periods reaching approximately 200 nm. We outline the key design considerations, demonstrate spatial and temporal beam overlap, and assess the expected signal levels, highlighting the challenges associated with low diffraction efficiency.
