TY - JOUR
T1 - Polarization effects and the role of above-threshold ionization photoelectrons in high-order harmonic generation
T2 - comparison of experiment with quantum electrodynamic theory
AU - Gao, J.
AU - Shen, F.
AU - Eden, J. G.
PY - 1999/9/14
Y1 - 1999/9/14
N2 - Transition matrix elements derived previously (J Gao et al 1998 Phys. Rev. Lett. 81 1833) from QED theory to describe high-order harmonic generation in intense optical fields are modified for elliptically polarized fields and compared with semiclassical theory and recent experimental studies of harmonic polarization characteristics. Calculations are in agreement with published data for Ne and Ar, including measurements of the components of the harmonic yield that are parallel or transverse to the major axis of the polarization ellipse for the driving optical field. The results confirm that preserving discrete photoelectron energies and incorporating two to three above-threshold ionization orders into the calculations account for the data. Also, the calculations demonstrate that the Volkov → Volkov state transition matrix element is capable of describing the polarization characteristics of the harmonics.
AB - Transition matrix elements derived previously (J Gao et al 1998 Phys. Rev. Lett. 81 1833) from QED theory to describe high-order harmonic generation in intense optical fields are modified for elliptically polarized fields and compared with semiclassical theory and recent experimental studies of harmonic polarization characteristics. Calculations are in agreement with published data for Ne and Ar, including measurements of the components of the harmonic yield that are parallel or transverse to the major axis of the polarization ellipse for the driving optical field. The results confirm that preserving discrete photoelectron energies and incorporating two to three above-threshold ionization orders into the calculations account for the data. Also, the calculations demonstrate that the Volkov → Volkov state transition matrix element is capable of describing the polarization characteristics of the harmonics.
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U2 - 10.1088/0953-4075/32/17/302
DO - 10.1088/0953-4075/32/17/302
M3 - Article
AN - SCOPUS:0343219786
SN - 0953-4075
VL - 32
SP - 4153
EP - 4161
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
IS - 17
ER -