title: Optical-vortex laser ablation.
abstract: Laser ablation of Ta plates using nanosecond optical vortex pulses was carried out, for the first time. It was suggested that owing to orbital angular momentum of optical vortex, clearer and smoother processed surfaces were obtained with less ablation threshold fluence, in comparison with the ablation by a nonvortex annular beam modified from a spatially Gaussian beam.
authors.affiliation: Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan. hamazaki@topology.coe.hokudai.ac.jp
authors.forename: Junichi
authors.initials: J
authors.lastname: Hamazaki
authors.forename: Ryuji
authors.initials: R
authors.lastname: Morita
authors.forename: Keisuke
authors.initials: K
authors.lastname: Chujo
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tanda
authors.forename: Takashige
authors.initials: T
authors.lastname: Omatsu