Characteristics of High-order Harmonic Generation in Carbon Dioxide Gas Jet

Abstract

Angular characteristics of high-order harmonic generation from aligned CO₂ molecules have been investigated. The modulation inversion of harmonic yield with respect to molecular alignment can be altered dramatically by fine tuning the intensity of driving laser pulse for harmonic generation. The result is beyond the two-center quantum interference model and can be modeled by employing the strong field approximation including ground state depletion effect. Laser intensity is found to be a new parameter to control the high harmonic emission from aligned molecules.