In situ measurement and control of the laser-induced strong field ionization phenomena

by Mr. Noam Shlomo

Ben-Gurion University of the Negev

at Quantum optics seminar

Wed, 06 Mar 2024, 16:00
Zoom Only

Abstract

Student Seminar

Zoom link: https://us02web.zoom.us/j/85701052255?pwd=Q3dmNnJNZ1BGdk82NkRpUFVNRklPZz09

Abstract:
High harmonic generation (HHG) is a process in which intense laser fields interact with a gas medium, resulting in the emission of extreme ultraviolet (XUV) radiation. Accurately characterizing the intensity and duration of the driving laser within the interaction volume remains a major bottleneck, limiting the accuracy of HHG experiments. We present a novel scheme for in-situ measurement and control of the strong-field femtosecond laser pulse, which combines conjugate focal imaging with ion measurements using gas densities relevant to attosecond science experiments [1]. Independent measurements in helium and argon, accompanied by fitting to a strong-field ionization dynamic model, yield accurate and consistent results across a wide range of gas densities, underscoring the significance of double ionization as well as barrier suppression ionization.
In the second part, we demonstrate a dynamic four-dimensional (3D space + 1D time) strong field ionization tomography modality of a supersonic pulsed gas jets [2], which is regularly used in HHG experiments. This extends the work in [3] by incorporating the fourth dimension of time. The temporal resolution of our method, limited only by electronic jitter to a few picoseconds, significantly exceeds the natural time scale of the underlying physical processes of the gas expansion and turbulence.

[1] N. Shlomo, E. Frumker, “In situ measurement and control of the laser-induced strong field ionization phenomena”, arXiv:2401.17028 [physics.atom-ph].
[2] N. Shlomo, E. Frumker, “In-situ dynamic four-dimensional strong field ionization tomography for space-time mapping of gas jets”, manuscript in preparation, 2024.
[3] O. Tchulov, M. Negro, S. Stagira, M. Devetta, C. Vozzi, E. Frumker, “Laser induced strong-field ionization gas jet tomography” Sci. Rep. 7, 1 (2017).

Created on 02-03-2024 by Folman, Ron (folman)
Updaded on 02-03-2024 by Folman, Ron (folman)