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TY - JOUR
TI - Theory of high-harmonic generation by low-frequency laser fields
DO - 10.1103/PhysRevA.49.2117
AU - Lewenstein, M.
AU - Balcou, Ph.
AU - Ivanov, M. Yu.
AU - L'Huillier, A.
AU - Corkum, P. B.
T2 - Physical Review A
SN - 1050-2947
VL - 49
IS - 3
SP - 2117
EP - 2132
KW - Atomic physics
KW - Atoms
KW - Diffusion
KW - Electron energy levels
KW - Electron scattering
KW - Electron transitions
KW - Electrons
KW - Harmonic analysis
KW - Harmonic generation
KW - Laser beams
KW - Light polarization
KW - Mathematical models
KW - Atomic dipole matrix elements
KW - Atomic potentials
KW - Floquet equations
KW - Ground state
KW - Ionization energy
KW - Low frequency laser fields
KW - Ponderomotive energy
KW - Quantum tunneling
KW - Saddle point technique
KW - Schrodinger equations
KW - Quantum theory
AB - We present a simple, analytic, and fully quantum theory of high-harmonic generation by low-frequency laser fields. The theory recovers the classical interpretation of Kulander et al. in Proceedings of the SILAP III Works hop, edited by B. Piraux (Plenum, New York, 1993) and Corkum [Phys. Rev. Lett. 71, 1994 (1993)] and clearly explains why the single-atom harmonic-generation spectra fall off at an energy approximately equal to the ionization energy plus about three times the oscillation energy of a free electron in the field. The theory is valid for arbitrary atomic potentials and can be generalized to describe laser fields of arbitrary ellipticity and spectrum. We discuss the role of atomic dipole matrix elements, electron rescattering processes, and of depletion of the ground state. We present the exact quantum-mechanical formula for the harmonic cutoff that differs from the phenomenological law Ip+3.17Up, where Ip is the atomic ionization potential and Up is the ponderomotive energy, due to the account for quantum tunneling and diffusion effects.
PY - 1994
DA - 1994
LA - eng
C1 - Collection / Collection : NRC Publications Archive / Archives des publications du CNRC
C2 - Record identifier / Identificateur de lâ€™enregistrement : 3fbd2f69-9a2d-4be9-af33-006ebb8003d2
ER -