Double glue axis cone mirror and method for generating long-distance high-resolution Bessel beam

Abstract

The invention discloses a double glue axis cone mirror and method for generating a long-distance high-resolution Bessel beam. The double glue axis cone mirror comprises a positive axis cone mirror body and a negative axis cone mirror body. The refractive index of a material of the positive axis cone mirror body is greater than the refractive index of a material of the negative axis cone mirror body, and the refractive index of the material of the negative axis cone mirror body is greater than the refractive index of a space medium outside the double glue axis cone mirror. According to the double glue axis cone mirror and method for generating the long-distance high-resolution Bessel beam, the propagation path of the incident plane wave is effectively changed by constructing the structure of the double glue axis cone mirror and simultaneously matching the refractive index difference between the two materials used by the positive axis cone mirror body and the negative axis cone mirror body which form the double glue axis cone mirror, the farthest transmission distance of the generated Bessel beam can be increased by a plurality of orders of magnitude, the double glue axis cone mirrorcan be applied to remote high-resolution imaging and detection, and very important practical application significance is achieved.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a double-glued axicon mirror and a method for generating long-distance high-resolution Bessel beams. Background technique [0002] Bessel beam is a kind of non-diffracting beam. When it propagates in free space, the light intensity distribution remains unchanged on any cross-section perpendicular to the direction of propagation. Since the light intensity distribution of the Bessel beam does not depend on the position on the axis, the requirements for precise alignment of the experimental system are greatly reduced, and the stability and accuracy of the system are improved. Therefore, it is widely used in laser processing, interferometry, and optics. There are broad application prospects in capture and other aspects. In practical applications, there are many kinds of optical devices that can be used to generate Bessel beams, such as annular slit-lenses, computer holograms, spher...

AI Technical Summary

Problems solved by technology

However, limited by the existing processing and manufacturing technology, it is difficult to manufacture an axicon with a very small base angle (generally less than 1 degree), and the longest transmission distance of the Bessel beam produced by it is generally only a few meters. This obviously cannot meet the needs of applications such as long-distance imaging and detection.

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