Lines of periodic hole structures produced by laser ablation using interfering femtosecond lasers split by a transmission grating

Abstract

Long lines of periodic hole structures were produced on a gold film, a glass slide and polystyrene by laser ablation using interfering femtosecond lasers split by a transmission grating. An optical system comprising a cylindrical lens added to an imaging system with a transmission grating was used to obtain the interference of two beams along a long length, and high laser fluence was used to achieve laser ablation. The separation of each hole was 6.25 μm, and the total length of the structure produced reached 6 mm, which is longest periodic structure produced by a shot of femtosecond laser.