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The optical Kerr response of hydrogen atom submitted to a strong and short near infrared laser pulse excitation is studied by solving the full 3D time-dependent Schro¨dinger equation. The nonlinear polarization evaluated at the driving field frequency is compared to the canonical expression derived from perturbation theory. A discrepancy between the two models is observed at large intensity affecting...
We propose a new technique for efficient generation of 6 THz near-single-cycle transients though optical rectification of 800 nm fs laser pulses in a DAST/SiO2 multilayer structure. The use of such a composite material allows to obtain phase-matching and control cascaded nonlinear processes.
Summary form only given. When intense TW-fs-laser pulses propagate through the atmosphere, nonlinear effects like self-phase modulation (SPM), self-focusing (SF) or degenerated four-wave mixing (DFWM) cause an immense change of the temporal and spatial profile. The frequency content is changed, too. Depending on the initial beam profile, the pulse duration and other parameters like temporal chirp,...
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