P Corkum 1993 + Lewenstein 1994 three-step model: tunnel-ionization, free-electron acceleration, recombination -> high-harmonic photon up to 3.17 Up cutoff.
P Corkum 1993 + Lewenstein 1994 three-step model: tunnel-ionization, free-electron acceleration, recombination -> high-harmonic photon up to 3.17 Up cutoff.