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Optical Engineering

Characteristics of a laser beam spot focused by a binary diffractive axicon
Author(s): Yuko Kizuka; Makoto Yamauchi; Yoshihiko Matsuoka
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Paper Abstract

Bessel beams formed by an axicon are nondiffracting beams. Such beams are used in the field of laser machining because they have several desirable characteristics, including a micron-sized focal spot and a deep focal depth. Conical lenses are generally employed for producing Bessel beams. A binary diffractive axicon was made by electron beam fabrication; the first-order diffracted beam from this axicon has a similar optical field to that of a refracted beam from a conical lens. The characteristics of a laser beam spot focused by the axicon were investigated. We demonstrated theoretically and experimentally that the peak intensity on the optical axis oscillated with a larger amplitude as the spot size decreased when the beam spot was observed in the vicinity of the axicon. This phenomenon was well explained by taking higher-order diffraction into account. We also investigated the wavelength dependence of the spot size focused by the axicon, and found that the spot size was constant.

Paper Details

Date Published: 1 May 2008
PDF: 7 pages
Opt. Eng. 47(5) 053401 doi: 10.1117/1.2919739
Published in: Optical Engineering Volume 47, Issue 5
Show Author Affiliations
Yuko Kizuka, National Institute of Advanced Industrial Science and Technology (Japan)
Makoto Yamauchi, National Institute of Advanced Industrial Science and Technology (Japan)
Yoshihiko Matsuoka, National Institute of Advanced Industrial Science and Technology (Japan)


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