Effects of ambient air pressure on surface structures produced by ultrashort laser pulse irradiation.


We report an experimental analysis addressing striking effects of residual air ambient pressure, from atmospheric conditions (10<sup>3</sup>  mbar) to high vacuum (10<sup>-4</sup>  mbar), on the surface structures induced on a silicon target by direct femtosecond laser irradiation. We observe an interesting direct impact of the ambient pressure on the… (More)
DOI: 10.1364/OL.42.002710