• Femtosecond-pulse-train ionization of Rydberg wave packets 

      Simonsen, Sigrid Ina; Sørngård, Stian Astad; Førre, Morten; Hansen, Jan Petter (Peer reviewed; Journal article, 2012-10-09)
      We calculate, based on first-order perturbation theory, the total and differential ionization probabilities from a dynamic periodic Rydberg wave packet of a given n-shell exposed to a train of femtosecond laser pulses. The ...
    • The global potential for carbon capture and storage from forestry 

      Ni, Yuanming; Eskeland, Gunnar; Giske, Jarl; Hansen, Jan Petter (Peer reviewed; Journal article, 2016-02-26)
      Background: Discussions about limiting anthropogenic emissions of CO2 often focus on transition to renewable energy sources and on carbon capture and storage (CCS) of CO2. The potential contributions from forests, forest ...
    • High-order harmonic generation from graphene: Strong attosecond pulses with arbitrary polarization 

      Sørngård, Stian Astad; Simonsen, Sigrid Ina; Hansen, Jan Petter (Peer reviewed; Journal article, 2013-05-03)
      We explore high-order harmonic generation (HHG) from a graphene sheet exposed to intense femtosecond laser pulses based on the Lewenstein model. It is demonstrated that the HHG cutoff frequency increases with graphene size ...
    • Interatom intrashell blockade 

      Sælen, L.; Simonsen, Sigrid Ina; Hansen, Jan Petter (Peer reviewed; Journal article, 2011-01-07)
      We demonstrate a feature of the Rydberg blockade mechanism which occurs between two initially excited circular Rydberg atoms. When both atoms are exposed to weak time-dependent electric fields, it is shown that the intrashell ...
    • Optical velocity meter based on Ramsey oscillations in a double-grating setup 

      Preclíková, Jana; Kozák, Martin; Fregenal, Daniel; Hansen, Jan Petter (Peer reviewed; Journal article, 2014-04)
      We propose a method for measuring velocities of atoms or molecules in a gas phase based on time-resolved laser experiments. Two intensity gratings of electromagnetic field with variable time delay τ are created by interfering ...
    • Outlook of solar energy in Europe based on economic growth characteristics 

      Madsen, Dorte Nørgaard; Hansen, Jan Petter (Peer reviewed; Journal article, 2019)
      Solar power production in Europe has raised from about 130 MW to 110 GW of installed capacity (corresponding to 90 GWh to 120 TWh in annual electricity generation) during the present century. Together with wind power, it ...