Ultrafast spectroscopy uses ultrashort laser pulses to study atomic and molecular structure and dynamics on extremely short time scales. Performance and Stability Don't compromise – get the shortest pulse widths and rock-solid stability. Operational Simplicity Choose a one-box laser/amplifier or. Ultrafast Systems is expert in the design and manufacture of optical spectrometers with high time resolution, with particular focus on femtosecond and picosecond time scales. Generation, amplification and frequency conversion IV. Full collisions vs half collisions 2. Potential. To study the dynamic electronic structure of molecular ensembles and materials, we primarily utilise the femtosecond time-resolved, extreme ultraviolet photoelectron spectroscopy technique.