Theoretical analysis of a quasi-Bessel beam for laser ablation

Pinghui Wu; Chenghua Sui; and Wenhua Huang

doi:10.1364/PRJ.2.000082

Journals >Photonics Research >Volume 2 >Issue 3 >Page 82 > Article

Photonics Research
Vol. 2, Issue 3, 82 (2014)

Theoretical analysis of a quasi-Bessel beam for laser ablation

Pinghui Wu^1,2,*, Chenghua Sui³, and and Wenhua Huang²

Author Affiliations

¹State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China

²Department of Physics, Huzhou University, Huzhou 313000, China

³Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China

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DOI: 10.1364/PRJ.2.000082 Cite this Article Set citation alerts

Pinghui Wu, Chenghua Sui, and Wenhua Huang, "Theoretical analysis of a quasi-Bessel beam for laser ablation," Photonics Res. 2, 82 (2014) Copy Citation Text

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Abstract

A quasi-Bessel beam (QBB) is suitable for laser ablation because it possesses a micrometer-sized focal spot and long depth of focus simultaneously. In this paper, the characterizations of QBBs formed by the ideal axicon and oblate-tip axicon are described. Strong on-axis intensity oscillations occur due to interference between the QBB and the refracted beam by the oblate tip. Using the axicon for laser ablation was theoretically investigated. Simple analytical formulas can be used to predict the required laser parameters, including the laser pulse energy, the generated fluence distributions, and the beam diameters.

Keywords

Laser beam characterization Laser beam shaping Laser materials processing

I (ρ, w) = \frac{I_{0} π β w}{2} {\begin{cases} {[(F_{1} (ρ / w) + F_{2} (ρ / w)) J_{0} (ρ β)]}^{2} \\ + {[(F_{1} (ρ / w) - F_{2} (ρ / w)) J_{1} (ρ β)]}^{2} \end{cases}},

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