title: High-order harmonic generation in a tightly focused laser beam.
abstract: The force due to the transverse magnetic field of a laser beam drives an electron in the direction of laser propagation, thereby impeding the recollision mechanism for high-order harmonic generation. The longitudinal electric field component of a tightly focused Gaussian beam can sufficiently counteract the magnetic force to enhance the harmonic yield substantially. For tight focusing and a laser intensity of 10(18) W/cm2, it can raise the harmonic yield by several orders of magnitude.
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Lin
authors.forename: S
authors.initials: S
authors.lastname: Li
authors.forename: W
authors.initials: W
authors.lastname: Becker