Fine-Pitched Microgratings Encoded by Interference of UV Femtosecond Laser Pulses
Abstract:Fine-pitched microgratings are encoded on fused silica surfaces by a two-beam laser interference technique employing UV femtosecond pulses from the third harmonics of a Ti:sapphire laser. A pump and prove method utilizing a laser-induced optical Kerr effect or transient optical absorption change has been developed to achieve the time coincidence of the two pulses. Use of the UV pulses makes it possible to narrow the grating pitches to an opening as small as 290 nm, and the groove width of the gratings is of nanoscale size. The present technique provides a novel opportunity for the fabrication of periodic nanoscale structures in various materials.
Document Type: Communications
Affiliations: 1: Hosono Transparent Electro-Active Materials Project, ERATO, Japan Science and Technology Corporation, KSP C-1232, Sakato 3-2-1, Takatsu-ku, Kawasaki 213-0012, Japan 2: Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Japan
Publication date: July 1, 2002
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