Open AccessNon-diffraction-length, tunable, Bessel-like beams generation by spatially shaping a femtosecond laser beam for high-aspect-ratio micro-hole drilling
Author(s) -
Zhulin Yao,
Lan Jiang,
Xiaowei Li,
Andong Wang,
Zhi Wang,
Ming Li,
Yongfeng Lu
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.021960
Subject(s) - optics , bessel beam , materials science , femtosecond , laser beam quality , laser drilling , diffraction , bessel function , beam (structure) , laser , spatial light modulator , phase (matter) , laser beams , physics , quantum mechanics
Bessel beams are advantageous in high aspect-ratio microhole drilling because of their immunity to diffraction. However, conventional methods of generating Bessel beams result in poor adjustability of the nondiffraction length. In this study, we theoretically describe and experimentally demonstrate the generation of Bessel-like beams (BLBs) with an adjustable nondiffraction length by using a phase-only spatial light modulator. In this method, nondiffraction lengths varying from 10 to 35 mm can be achieved by changing the designed phase profile (curvature). High-quality, high aspect ratio (560:1) and length-adjustable microholes can be drilled by spatially shaping a femtosecond laser beam.