Materials processing with tightly focused femtosecond vortex laser beams

Details Materials processing with tightly focused femtosecond vortex laser beams Materials processing with tightly focused femtosecond vortex laser beams

2010-06-02

arxiv.org/abs/1006.0292v1

Physics

Optics

8 pages, 3 figures, 10 references; submitted to Appl. Phys. Lett. on May 31, 2010

Scientific paper

This letter is the first demonstration of material modification using tightly focused femtosecond laser vortex beams. Double-charge femtosecond vortices were synthesized with the polarization-singularity beam converter described in Ref [1] and then focused using moderate and high numerical aperture optics (viz., NA = 0.45 and 0.9) to ablate fused silica and soda-lime glasses. By controlling the pulse energy we consistently machine high-quality micron-size ring-shaped structures with less than 100 nm uniform groove thickness.

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