Seminars Archive

Single-shot pulse duration and timing measurement method for ultrafast PP-experiments-

Abstract
The resolution of ultrafast studies performed at extreme ultraviolet and X-ray free-electron lasers is still limited by shot-to-shot variations of the temporal pulse characteristics. We present a versatile single-shot temporal diagnostic tool that allows the determination of the extreme ultraviolet pulse duration and the relative arrival time with respect to an external pump-probe laser pulse. The presented single-shot method of transient reflectivity gating in non-collinear beam geometry is based on a method for single-shot timing measurements of FEL pulses relative to an external visible laser. The new method relies on detailed modeling of the plasma generation to be able to extract the FEL pulse length from the duration of the transient via a deconvolution. We present measurements performed at the FLASH free-electron laser at 5.5 and 41 nm. A jump in resolution which will increase measurement precision and eventually allow temporal monitoring of two time separated FEL pulses in single-shot will be possible with shorter probe pulse of <20 fs.