Abstract
An interference pattern of ultra-short pulse laser can be transcribed to material surface, and great number
of unit structures in matrix can be generated. In this paper, a variety of unit patterns are summarized in
the case of four and six beam correlation. The patterns can be controlled by phase and amplitude
variation between beams, and with ratio between processing fl uence and ablation threshold. In addition,
interference patterns with concurrent irradiation of fundamental and second-harmonic generation (SHG),
named “mode-locked interference” are shown. “Au nanowhisker”, which is a 3D nanostructure
fabricated by SLS (Solid-Liquid-Solid) process induced by interfering femtosecond laser processing,
was observed by TEM (transmission electron microscope).
