Optical-vortex laser ablation.
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.
Hamazaki
Junichi
J
Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan. hamazaki@topology.coe.hokudai.ac.jp
Morita
Ryuji
R
Chujo
Keisuke
K
Kobayashi
Yusuke
Y
Tanda
Satoshi
S
Omatsu
Takashige
T