Full text of article: Russian language.

Abstract:
Parameters of a focal spot and depth of the field formed by DOE which phase function represents a tandem of lens+axicon (lensacon) are theoretically investigated. In this case in comparison with linear axicon the focal depth decreases and the focal spot size becomes variable and can diminish much more strongly than allow each of optical elements of a tandem separately.
The new type of phase DOE – fracxicon – optical element having fractional degree of dependence on radial coordinate is entered. Depending on value of fractional degree fracxicon allows to form reducing in scale Bessel beams (similarly as lensacon) and increasing in scale nondiffractive beams, that is close on properties to logarithmic axicon, but without singularity in the central part of an optical element.

Key words: diffractive linear axicon, lensacon, diffractive fracxicon, size of a focal spot, depth of a field.

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