The thresholds of surface nano-/micro-morphology modifications with femtosecond laser pulse irradiations.
We studied the pulse energy threshold of surface nano-/micro-morphology modifications by irradiating Si, GaAs, GaP, InP, Cu and Ti surfaces with 100 fs laser pulses at a wavelength of 800 nm in air and in water. We found that the laser pulse energy thresholds required for the permanent modification in water are up to 30% lower than those in air. Different non-equilibrium dynamics processes of the surface melting layer cause the different thresholds in water and in air.
Wang
Cong
C
Department of Physics and Applied Physics, and Nanomanufacturing Center, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA.
Huo
Haibin
H
Johnson
Michael
M
Shen
Mengyan
M
Mazur
Eric
E