[17a-P04-1~5] 3.7 Laser processing

[17a-P04-4] Irradiation of Nanosecond Optical Vortex Laser Pulse on Au Film

〇(M1)Tsubasa Fujimoto¹, Mitsuhiro Higashihata¹, Hiroshi Ikenoue^1,2, Daisuke Nakamura¹ (1.ISEE, Kyushu Univ., 2.Dept. of Gigaphoton Next GLP, Kyushu Univ.)

Keywords:optical vortex, twist structure, pulsed laser

Optical vortex laser pulses were focused and irradiated onto Au thin film using a nanosecond visible laser. The irradiation marks were observed when the laser pulses were defocused from the focal point to the optical axis. It was confirmed that a needle with a twisted structure was formed in the irradiation with suitable fluence and focusing diameter.