There is an astonishing simplicity in some processes of intense-laser interactions. At high field amplitudes, there is an optimal probability for the electron to tunnel out of the atom. Then, the field interaction dominates and the electrons evolve almost freely. High-order harmonics (HH) are emitted when these fast electrons are driven back to rescatter with the ion, converting their kinetic energy into high-frequency radiation…
See more about our recent publication in Journal of Physics B in this link.
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