The isotopic dependence and influence of driving laser intensity on the harmonic yields of diatomic molecule ions X2+

Abstract

The harmonic yields from X2+ (including H2+, D2+ and T2+) driven by 800 nm laser with different laser intensities and pulse durations have been studied. At shorter pulse duration, the harmonic yields of X2+ follows as H2+ > D2+ > T2+, and the intensity difference is decreased as laser intensity increases. At longer pulse duration, the harmonic yields of X2+ follows as T2+ > D2+ > H2+, and the intensity difference is increased as laser intensity increases. Furthermore, the harmonic yield from X2+ can also be modulated by laser chirps. Finally, the physical mechanism is displayed clearly in ionization probability, internuclear distance and time-profile of harmonic emission.