摘要
An interesting transition between low spatial frequency laser-induced periodic surface structure （LIPSS） and high spatial frequency LIPSS （HSFL） on the surface of aickel is revealed by changing the scanning speed and the laser fluence. The experimental results show the proportion of HSFL area in the overall LIPSS （i.e., K） presents a quasi-parabola function trend with the polarization orientation under a femtoseeond （fs） laser single-pulse train. Moreover, an obvious fluctuation dependence of Kon the pulse delay is observed under a fs laser dual-pulse train. The peak value of the fluctuation is found to be determined by the polarization orientation of the dual-pulse train.
An interesting transition between low spatial frequency laser-induced periodic surface structure （LIPSS） and high spatial frequency LIPSS （HSFL） on the surface of aickel is revealed by changing the scanning speed and the laser fluence. The experimental results show the proportion of HSFL area in the overall LIPSS （i.e., K） presents a quasi-parabola function trend with the polarization orientation under a femtoseeond （fs） laser single-pulse train. Moreover, an obvious fluctuation dependence of Kon the pulse delay is observed under a fs laser dual-pulse train. The peak value of the fluctuation is found to be determined by the polarization orientation of the dual-pulse train.
基金
supported by the National 973Program of China(No.2011CB013000)
the National Natural Science Foundation of China(Nos.91323301 and51322511)
