Abstract
The dynamics and propagation effects in attosecond (asec) pulse generation from high-order harmonic generation (HHG) of aligned one-dimensional (1D) H2+ molecules are investigated from numerical solutions of fully coupled Maxwell and time-dependent Schrödinger equations (Maxwell-TDSEs), in the highly nonlinear nonperturbative regime of laser–molecule interaction. Density, laser-phase and propagation length effects are studied on the total electric field and nonlinear polarization from the Maxwell-TDSE for intense few cycle (800 nm) laser pulses interacting with a 1D H2+ gas. We show how single and double asec pulses can be generated and propagated as a function of the phase of individual harmonics created by ultrashort intense laser pulses in aligned H2+ molecules. We find furthermore extension of maximum HHG plateaux with increasing gas pressure.
Highlights
Efficient generation of new asec pulses [21]
We study the process of asec pulse generation by the analysis of harmonic phases, and their behavior depending on the driver phase, using a model that is a micro–macro Maxwell-TDSE approach [24, 26]
We investigate the harmonic intensities of the transmitted electric field (ω, |ET(ω)|2) for N = 3, 7 and 11 at different distances
Summary
An appropriate Maxwell-TDSE equation for this system was used based on a slowly varying envelope approximation (SVEA) leading to a first-order partial differential equation for the coupled Maxwell-TDSE system [22]. Such an approach neglects ground state depletion due to ionization, neglects backward propagation and is appropriate for low field strengths. We present a new phenomenon, a study of the driver phase effect on the HHG and laser pulse propagation
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