Application of frequency-domain interferometry to ultrafast dynamic physics

The pulse frequency-domain interferometry is introduced as a new measurement technology with femtosecond resolution. Its working principle and system structure are elaborated, and the time difference and phase difference are pointed out as the primary factors determining the fringe period in frequency-domain interferometer. The velocity profile of an aluminium foil pumped by an 800 nm, 0.7 mJ, 35 fs laser pulse was measured by the frequency-domain interferometry. The preliminary measurement shows that the maximal velocity is 960 m/s with a rise time less than 5.77 ps in the velocity profile.