Aspect of harmonic Generation from Solid Surface Plasma by Using Picosecond Laser

摘要

Investigations have been performed on harmonic generation from solid-vacuum interfaces using a prepulse-free 2.2 ps, 1054 nm laser at maximum intensities of ~ 2 x 10~17W cm~-2. We observed, for the first time, that the divergence of harmonics decreases as the order of the harmonic increases when irradiated at the same pump intensity. We also measured that the third harmonics emission is more specular when using a shorter pulse. The harmonic intensities were stronger for p-polarized pump than s-polarized pumps. It has been found that the conversion efficiency of higher harmonic decreases graddually.