Novel optical element for generating non-diffracting light

Abstract

The invention discloses a optical element for generating non-diffracting light, comprising a positive axis pyramid and a negative axis pyramid which have the same radius of the bottom surface, wherein the positive axis pyramid is in a cone structure the bottom surface of which is in a plane shape; the bottom of the negative axis pyramid is in a conical concave shape and the top surface is in a plane corresponding to the bottom surface of the positive axis pyramid; the bottom surface of the positive axis pyramid and the top surface of the negative axis pyramid coincide with and are glued together; and the base angle of the positive axis pyramid is larger then that of the negative axis pyramid. Through the wave optical and matrix optical theory, an equivalent base angle of the novel optical element for generating non-diffracting light is the difference between the base angles of the positive axis pyramid and the negative axis pyramid; by the combination of the positive axis pyramid and the negative axis pyramid with larger base angles, the characteristics of the optical element are same as the characteristics of the positive axis pyramid with small angle, and the base angles of the positive axis pyramid and the negative axis pyramid are not limited in the smaller angle; in addition, the invention overcomes the current situation that the small angle is difficult to process, reduces the requirement on the processing technology, reduces the processing cost and can be widely applied in the process of actually generating the non-diffracting light.

Description

technical field [0001] The invention is an optical element capable of generating non-diffraction light, which is suitable for precision collimation, scientific research and the like, and can be widely used especially in the process of actually generating non-diffraction light. Background technique [0002] J. Durnin of the University of Rochester in the United States first proposed non-diffraction light in 1987. It propagates in free space without diffraction, that is, the distribution of the transverse light field does not change with the propagation distance during the propagation process; the energy of the light field is concentrated, and the central spot is small and strong. high. The attractive feature of non-diffraction light makes it have many potential applications, such as in precise measurement and collimation, precision machining and cutting, guidance of charged particles and neutral atoms, micro-manipulation experiments, nonlinear optics, etc. [0003] The metho...

AI Technical Summary

Problems solved by technology

However, in the practical application of non-diffraction beams, long-distance non-diffraction light is often required, and the maximum non-diffraction distance formula It can be seen that under a certain incident beam radius a, the maximum non-diffraction distance Z max It is inversely proportional to the base angle θ of the axicon, that is, the diffraction-free distance formed by the axicon with the smaller base angle is longer, but the axicon with the smaller base angle requires higher processing technology and higher cost, which limits the Wide application of non-diffraction light

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