Effect of transmission characteristics of femtosecond laser focusing on micro-/nanostructure morphology of titanium alloy

Various types of micro-/nanostructures can be fabricated by femtosecond laser irradiation on metal surfaces. It has received extensive attention and research because its potential application value. In this paper, the effect focusing position micro-/nanostructure formation surface a titanium alloy (TC4) was systematically researched. The experimental results show that, in process focusing, spatial distribution energy with narrower beam center ring around is formed front geometric focus changes along transmission direction. This property affect morphology irradiated materials. believed that new fluence caused due to nonlinear plasma defocus self-focusing multi-photon or tunnel ionization target laser. discovery characteristics focused unique put forward idea for direct fabrication via laser, which certain significance development micro-/nanofabrication technology lasers.