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Quantum theory of a high harmonic generation as a three-step process

M. Yu. Kuchiev·V. N. Ostrovsky
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Abstract

Fully quantum treatment explicitly presents the high harmonic generation as a three-step process: (i) above threshold ionization (ATI) is followed by (ii) electron propagation in a laser-dressed continuum. Subsequently (iii) stimulated (or laser assisted) recombination brings the electron back into the initial state with emission of a high-energy photon. Contributions of all ATI channels add up coherently. All three stages of the process are described by simple, mostly analytical expressions that allow a detailed physical interpretation. A very good quantitative agreement with the previous calculations on the harmonic generation by H-minus ion is demonstrated, thus supplementing the conceptual significance of the theory with its practical efficiency. The virtue of the present scheme is further supported by a good accord between the calculations in length and velocity gauges for the high-energy photon.

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M. Yu. Kuchiev, V. N. Ostrovsky. 1999-06-26. Quantum theory of a high harmonic generation as a three-step process. https://doi.org/10.1103/physreva.60.3111

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