title: Two-dimensional periodic structure induced by single-beam femtosecond laser pulses irradiating titanium.
abstract: A novel two-dimensional (2-D) periodic structure on the ablated hole wall is formed by using the method of single-beam femtosecond laser pulses irradiating a titanium target. This 2-D structure on the ablated surface, after consecutive irradiation of 10000 pulses, presents different spatial periods which characters a 1500 nm period along the hole wall in the vertical direction and a 400 nm period in the azimuthal direction of the hole. The reported experimental results can be well interpreted by a prophetic theoretical model of Bonch-Bruevich (A. M. Bonch-Bruevich et al., Opt. Eng. 31, 718 (1992)).
authors.affiliation: Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, P. R. China.
authors.forename: Yongguang
authors.initials: Y
authors.lastname: Huang
authors.forename: Shibing
authors.initials: S
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Yuanxing
authors.initials: Y
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Yang