Speaker: Prof. Zigler, Hebrew University
Time: 2:00 p.m., April 23 (Monday), 2018
Venue: Yizhi Hall, West Campus
Prof. Zigler has more than 30 years of experience in experimental physics in area of electro-optics, spectroscopy, high power lasers, plasma physics, interaction of high intensity, ultra-short pulse laser with matter. He holds a Chair of Physics at Faculty of Science of Hebrew University in Jerusalem and is a Full Professor at Racah Institute of Physics at Hebrew University of Jerusalem. Dr. Zigler has published over 200 scientific publications, delivered numerous invited talks at scientific conferences and holds 12 patents. He is also one fellow of American Physics Society.
This report is about the interaction of high-intensity laser pulses with solid targets, which results in generation of large quantities of energetic electrons which are the origin of various effects such as intense x-ray emission, ion acceleration, and so on. Our recent measurements related to the field enhancement conducted on FLAME laser will be presented. We realized a spatially - resolved Electro Optical Sampling by using a ZnTe crystal and a laser-probe. Such solution allows monitoring temporal profile (with resolution < 100 fsec) in a single-shot way. We retrieved the bunch Coulomb electric field, allowing retrieving the temporal profile and the quantity of the escaped electrons and demonstrated the field enhancement process by structured targets. In the case of the planar foil target, the signal shows the presence of a first emitted bunch with charge Qe ~1. 2 nC Laser interaction with the tip target produced a much larger number of released electrons. We report, for the first time, a novel femtosecond-resolved experimental study of the fields generated by the interaction. Our results reveal the temporal evolution of large fields, up to 0.6 TV/m, that generated close to the target. Such a picture represents a new step toward the understanding of the entire interaction mechanism.