摘要
We report the formation dynamics of periodic ripples on Ga As induced by femtosecond laser pulses（800 nm, 50 fs） via a collinear time-resolved imaging technique with a temporal resolution of 1 ps and a spatial resolution of 440 nm. The onset of periodic ripples emerges in the initial tens of picoseconds in the timescale of material ejection. The periodic ripples appear after irradiation of at least two pump pulses at surface defects produced by the first pulse and the ripple positions kept stable until the formation processes complete. The formation mechanisms of laser-induced periodic ripples are also discussed.
We report the formation dynamics of periodic ripples on Ga As induced by femtosecond laser pulses（800 nm, 50 fs） via a collinear time-resolved imaging technique with a temporal resolution of 1 ps and a spatial resolution of 440 nm. The onset of periodic ripples emerges in the initial tens of picoseconds in the timescale of material ejection. The periodic ripples appear after irradiation of at least two pump pulses at surface defects produced by the first pulse and the ripple positions kept stable until the formation processes complete. The formation mechanisms of laser-induced periodic ripples are also discussed.
基金
supported by the National Natural Science Foundation of China(Nos.11104178,11274116,and 51132004)
the National Special Science Research Program of China(Nos.2010CB923203 and 2011CB808105)
the Innovation Program of Shanghai Municipal Education Commission(Nos.14YZ156,11JC1403500,and 10XD1401800)
the Young Teacher Program of Shanghai University(No.shdj006)
the Discipline Foundation Project of Shanghai Dianji University(No.12XKJC01)
