Analytical study on metal microstructures using femtosecond laser

作者：Okamoto T; Ohmura E; Sano T^*; Morishige Y; Miyamoto I

来源：Applied Physics A-Materials Science & Processing, 2005, 81(3): 639-643.

DOI：10.1007/s00339-004-2671-5

We made considerations for microstructures on chromium film observed after femtosecond laser irradiation through an analytical study. Laser diffraction through an optical system with a rectangular aperture was analyzed for the estimation of intensity distribution at the focal point. Molecular dynamics (MD) simulation was also performed for the examination of laser ablation of metal by taking account of the electron-phonon relaxation. From results of diffraction calculation, it was shown that a typical surface pattern is significantly affected by laser intensity distribution. On the other hand, it may be estimated through the MD simulation that the porosity formation evolves by cumulative pulses with energy close to the ablation threshold and their surrounding grows to microcolumns with volume expansion.

• 出版日期2005-8