Research on the influence of the off-axis processing axicon lens on the light field distribution of the non-diffracting beam

摘要

Non-diffracting beam are attracting increased attention because of their unique characteristics. A non-diffracting beam is usually generated with an axicon, which is a kind of line focus optical element with a conical surface axis that rotates symmetrically. Three deviation models of a generatrix relative to the ideal axicon have been established on its processing technology, namely, concave to the inner side, convex to the outer side and hyperbolic distribution of the apex of the axicon. The amplitude transmittance function is derived based on the profile of the generatrix. The emergent light field and intensity distributions of the three kinds of axicon in the case of plane wave verticality illumination are analyzed and simulated according to the Fresnel diffraction theory. Moreover, the theory of axicon diffraction field is enriched and the guiding significance for the processing of axicon lens is increased.