Ultrafast Spectroscopy at High-Pressures

Our lab has developed an ultrafast THz-pump/visible-probe microscopy setup to investigate strongly correlated systems under high pressures. This system is specifically designed for pump-probe experiments on two-dimensional materials within a diamond anvil cell (DAC). By integrating THz ultrafast optics with a custom-built imaging system, we enable precise measurements under extreme conditions.

As shown in the figure, the pump and probe beams are configured to impinge on the sample at normal and oblique incidence, respectively. A collinear white-light source is used for imaging, with its reflected component directed to a CMOS camera via a beamsplitter for sample visualization. This configuration allows us to perform both transient Optical Kerr Effect (tr-OKE) and transient reflectivity (tr-R) measurements with high spatial and temporal resolution.

Our approach opens new avenues for exploring the interplay between structural, electronic, and magnetic properties in strongly correlated systems, particularly under nonequilibrium conditions driven by ultrafast THz excitation.