Browsing by Author "Walker, Barry C."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Inner shell excitation by strong field laser rescattering: optimal laser conditions for high energy recollision(Journal of the Optical Society of America B, 2021-11-15) Kelley, L.; Germain, Z.; Jones, E. C.; Milliken, D.; Walker, Barry C.We address the challenge of finding the optimal laser intensity and wavelength to drive high-energy, strong field rescattering and report the maximum yields of K-shell and LI-shell hole creation. Surprisingly, our results show laser-driven rescattering is able to create inner shell holes in all atoms from lithium to uranium with the interaction spanning from the deep IR to x-ray free electron laser sources. The calculated peak rescattering follows a simple scaling with the atomic number and laser wavelength. The results show it is possible to describe the ideal laser intensity and wavelength for general high-energy laser rescattering processes.Item Polarizability, Stark shifts, and field ionization of highly charged ions in ultraintense lasers(Physical Review A, 2023-03-06) Jones, Evan C.; Andreula, Zachery P.; Walker, Barry C.We have calculated the polarization and Stark-shifted binding energy for ultraintense lasers interacting with highly charged ions across the periodic table from beryllium to uranium at intensities up to 1022Wcm−2. The induced dipole and Stark shifts for the bound states can be as large as 0.1ea0 and 50Eh. Calculations of tunneling show the impacts of polarization and Stark shifts on the ionization rate are significant but counteracting. The work resolves a long-standing question of how field-free derivations of the tunneling response for highly charged ions have been quantitatively successful in relativistic, ultrahigh-intensity experiments. Using a scaling relationship, the results can be generalized to give the induced electric dipole for any species across an intensity range from 1015 to 1022Wcm−2.