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Fresnel axicon.

¹iUreka, 31 Castleton Street, Ottawa, Ontario K2G 5P2, Canada. ilya.golub@rogers.com

|May 27, 2006

Summary

A novel optical element, the Fresnel axicon (fraxicon), is introduced. This refractive element offers advantages over existing axicons, being more compact, less chromatic, and easier to mass-produce.

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Area of Science:

Optics and Photonics
Optical Engineering

Background:

Axicons are optical elements that generate a non-diffracting Bessel beam.
Traditional axicons include refractive and diffractive types, each with manufacturing and performance limitations.

Purpose of the Study:

To propose and describe a new type of optical element: the Fresnel axicon (fraxicon).
To highlight the advantages of the fraxicon over existing axicon technologies.

Main Methods:

The fraxicon is designed with concentric prism-like grooves, analogous to a Fresnel lens.
Its optical function is based on refraction, similar to a bulk axicon.

Main Results:

The fraxicon exhibits reduced chromatic aberration compared to diffractive axicons.
It is more compact and has lower material absorption losses than refractive axicons.
The design facilitates simpler and more economical mass production.

Conclusions:

The Fresnel axicon (fraxicon) presents a promising alternative for generating Bessel beams.
Its manufacturing simplicity, compactness, and reduced chromaticity make it suitable for various applications.

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