Optical Fabrication

Characteristics of a laser beam spot focused by a binary diffractive axicon

[+] Author Affiliations
Yuko Kizuka

Advanced Industrial Science and Technology, Digital Manufacturing Research Center, AIST, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan

Makoto Yamauchi

Advanced Industrial Science and Technology, Digital Manufacturing Research Center, AIST, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan

Yoshihiko Matsuoka

Advanced Industrial Science and Technology, Advanced Manufacturing Research Institute, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan

Opt. Eng. 47(5), 053401 (May 12, 2008). doi:10.1117/1.2919739
History: Received November 03, 2007; Revised February 03, 2008; Accepted February 11, 2008; Published May 12, 2008
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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.

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© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Yuko Kizuka ; Makoto Yamauchi and Yoshihiko Matsuoka
"Characteristics of a laser beam spot focused by a binary diffractive axicon", Opt. Eng. 47(5), 053401 (May 12, 2008). ; http://dx.doi.org/10.1117/1.2919739


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