1 May 2008 Characteristics of a laser beam spot focused by a binary diffractive axicon
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Optical Engineering, 47(5), 053401 (2008). doi:10.1117/1.2919739
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.
Yuko Kizuka, Makoto Yamauchi, Yoshihiko Matsuoka, "Characteristics of a laser beam spot focused by a binary diffractive axicon," Optical Engineering 47(5), 053401 (1 May 2008). http://dx.doi.org/10.1117/1.2919739
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KEYWORDS
Axicons

Binary data

Diffraction

Bessel beams

Laser beam propagation

Optical engineering

Photography

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