Session Overview |
High Power Laser Technology, Ultrafast Optics and Applications - Bloc 3Room: International 1 |
Date: Wednesday, June 06 |
15:30 |
High-harmonic generation in gases and solids using waveform-synthesized mid-IR pulses
Main Author: Kyung-Han Hong Organization: Massachusetts Institute of Technology, United States We present recent results of high-harmonic generation driven by waveform-synthesized mid-infrared laser pulses: 1) enhanced high-harmonic generation (HHG) up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic and 2) solid-state HHG in silicon using synthesized sub-cycle mid-infrared pulses. |
15:55 |
Molecular Frame Reconstruction Using Rotational Wavepacket Photoionization Interferometry
Main Author: Claude Marceau Organization: Joint Attosecond Science Laboratory, National Research Council and the University of Ottawa, Canada We demonstrate how rotational wavepacket dynamics from impulsively aligned molecules can be used in a general time-domain framework to fully determine the magnitude and phase of each photoionization matrix element and provide access to the molecular frame. |
16:20 |
Adding an extra step to the three-step model of high-order harmonics
Main Author: Tsuneyuki Ozaki Organization: INRS-EMT, Canada We provide experimental and numerical evidence of the involvement of autoionizing states in intense high-order harmonics from tin, which is explained by the four-step model. |
16:45 |
Ultrafast Structural Dynamics: Developments and Applications
Main Author: Germán Sciaini Organization: University of Waterloo, Canada The field of ultrafast structural dynamics is growing quickly. The advent of ultrashort electron and hard X-ray pulses with sufficient brightness has made possible the observation of dynamical phenomena with atomic spatiotemporal resolution. An overview of the field and current developments at the Ultrafast electron Imaging Lab will be presented. |
17:10 |
Laser Wakefield driven X-ray sources at INRS : A brillant future for agriculture and global food security
Main Author: Jean Claude Kieffer Organization: INRS, Canada We upgraded, from mid 2014 to the end of 2016, the INRS high peak power laser facility from 200TW (5J, 25fs) to 600TW (12J, 18fs, 2.5Hz). The experimental programs have been restarted at the beginning of 2017 in the continuity of our previous scientific directions, i.e. high intensity laser-matter interaction and ultrafast X-ray sources. In this talk we will review our program realized with our new laser facility on the generation of ultrafast bright hard X-rays using Laser Wakefield. The application of this source to X-ray phase contrast imaging of Plants in the context of a global food security Initiative will be presented and discussed. |
17:25 |
Enhancing Laser-Driven Proton Beams Using Nanostructured Foils
Main Author: Simon Vallières Organization: INRS, Canada We present recent advances with the use of nanostructured solid foils, which allow to improve the proton beam characteristics in the context laser-driven particle acceleration. We show that they are able to increase the laser energy absorption compared to what can be achieved with conventional targets and are produced with a method that is much simpler and cheaper than conventional lithographic processes. The results of 2D PIC simulations are shown for nanowires and nanospheres compared to classical targets, along with preliminary experimental validations obtained at the JLF- TITAN laser at LLNL and also on the LULI-ELFIE laser at École Polytechnique de Paris. |
17:40 |
A real-space perspective on high harmonic generation in solids
Main Author: Guilmot Ernotte Organization: University of Ottawa, Canada We theoretically investigate high-harmonic generation in a 1D crystal. We solve the time-dependent Schrödinger equation of an independent electron under an intense laser field using Wannier localized states in contrast to the usual Bloch delocalized states. This approach maps in time the different lattice sites recombination to the harmonic spectrum. By identifying key properties of the energy bands and the dipole moments, we explain the motion of the electron across different lattice sites is explained. A semi-classical model predicts the harmonic spectrum calculated by the full quantum simulation. |