Suppression of ripples on ablated Ni surface via a polarization grating.
Gratings were recorded on the surface of nickel by ablation without formation of ripples using an interference of two p-polarized femtosecond laser beams at a pi/4 angle of incidence. The mechanism of ripples' suppression is explained by formation of a polarization grating and by ablation at the locations where the polarization is normal to the Ni surface. The aspect ratio of the ablated grooves was approximately 3 with the period approximately 570 nm at the central wavelength of irradiation of 800 nm. This method is applicable for laser structuring of different materials and a recorded grating structure can be scaled with the irradiation wavelength.
Iwase
Hideo
H
Production Engineering Headquarters, Canon Inc., Kawasaki-shi, Kanagawa 212-8602, Japan. iwase.hideo@canon.co.jp
Kokubo
Satoshi
S
Juodkazis
Saulius
S
Misawa
Hiroaki
H