Device and method for measuring diffusion velocity of electronic wave packet

Abstract

The invention discloses a device and a method for measuring the diffusion velocity of an electronic wave packet and aims at measuring a higher harmonic spectrum, screening the relationship between the elliptic polarization independence for exciting the wavelength of laser generated by the high harmonic spectrum and the wavelength of the laser and calculating the speed of the electronic wave packet and the sizes of the electric wave packets corresponding to different laser wavelengths according to the relationship between the sensitivity to the laser elliptic polarization degree and the electronic wave packet kinetic process. The measuring device and the measuring method have the characteristics of simpleness and effectiveness and important significance on understanding the evolution of the electronic wave packets in the strong-field physics and the electronic micro kinetics.

Description

technical field [0001] The invention relates to strong-field laser physics, in particular to a measuring device and method for electron wave packet diffusion velocity, which is of great significance for understanding the evolution of electron wave packets in strong-field physics and the microscopic dynamics of electrons. Background technique [0002] Since the first ruby ​​laser came out in 1960, as a light source with high brightness, high coherence and high collimation, laser has provided a powerful tool for people's daily life and scientific research. In the following decades, laser technology has made great progress. The emergence of pulsed lasers has provided people with laser light sources with higher intensity and shorter time-resolution scales, thus promoting the field of strong field, microscopic ultrafast field, biology and so on. Rapid progress in the field of research. The output pulse width of pulsed laser light sources is getting narrower and narrower, from th...

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Problems solved by technology

Under the action of a strong laser field with elliptically polarized polarization, when the electrons undergoing tunnel ionization travel in the light field for a period of time and return, they will deviate laterally relative to the parent ion, resulting in a decrease in the recombination rate of electrons and ions, and a significant decrease in harmonic efficiency (see Literature P.Dietrich, N.H.Burnett, M.Ivanov, and P.B.Corkum, Phys.Rev.A Vol.50, R3585, 1994)

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