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Diffraction-free beams and their caustics
I.G. Palchikova

 PDF, 630 kB

Pages: 35-40.

Full text of article: Russian language.

Abstract:
We discuss the feasibility of generating focal areas in different diffraction fields and prove that the term “diffraction-free beams” is used to designate a spatially limited portion of the toroidal light wave. The light line, or axial caustic, is a result of interference of intersecting areas of this wave. It is shown that the “diffraction-free beams” are generated by such optical elements whose phase transmission function includes linear terms with respect to the radial coordinate. A comparison of optical characteristics of caustics in the near- and far-diffraction fields is made. Synthesis of a new diffraction-modulated axicon that forms two focal areas of different types is reported. The results of experimental studies of its optical characteristics are discussed.

Citation:
Palchikova IG. Diffraction-free beams and their caustics. Computer Optics 1996; 16: 35-40.

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