Seminars Archive

THz Diagnostics Development at FLASH

Abstract
High-field THz radiation is a fascinating tool to study the interaction of electromagnetic waves with matter, such as demagnetization dynamics, tracking the ultrafast motion of a signal molecule, resonant control of states of matter and et al. THz beamline at FLASH1 provides both tunable narrow bandwidth (1-30THz) and broad bandwidth intense THz pulses for user's experiment. In order to characterize the THz pulse, several diagnostic tools are developed at FLASH, including power measurement, beam transverse profile measurement, spectrum measurement by Fourier-transform infrared spectroscopy (FTIR). Especially a THz arrival time and longitudinal profile characterization tool is developed. It is based on THz electro-optic (EO) sampling, in combination of EO spectral decoding for THz pulse arrival timing jitter correction. It enables characterization of THz pulse, as a statistical average used in the experiment, with high temporal and spectral resolution.