title: Enhanced high-order harmonic generation from spatially prepared filamentation in argon.
abstract: We experimentally demonstrate enhanced high-order harmonic generation (HHG) from spatially prepared filamentation in Argon. Upon shifting the focus position of an elliptically polarized laser pulse over the filament induced by a linearly polarized laser pulse, an obvious enhancement of harmonic yield by nearly one order of magnitude is observed. The result could be interpreted in terms of the double contributions from both the excited states of target atom and the phase-matching effect of harmonic beam. In contrast to the enhancement phenomena, an obvious suppression of harmonic yield is also presented, which could be attributed to both the ground-state depletion and the plasma effect.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Wei
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Yuan
authors.forename: Candong
authors.initials: C
authors.lastname: Liu
authors.forename: Zhinan
authors.initials: Z
authors.lastname: Zeng
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Zheng
authors.forename: Jiaming
authors.initials: J
authors.lastname: Jiang
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Ge
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li