Dual-glued axicon and method for generating long-range high-resolution bessel beam

Abstract

The invention discloses a dual-glued axicon and method for generating a long-range high-resolution bessel beam. The dual-glued axicon comprises a positive axicon and a negative axicon; the refractiveindex of a material of the positive axicon is greater than that of a material of the negative axicon, and the refractive index of the material of the negative axicon is greater than that of a spatialmedium outside the dual-glued axicon. By building the dual-glued axicon structure and using a refractive index difference between the two materials used for the positive axicon and the negative axiconwhich form the dual-glued axicon, the dual-glued axicon effectively changes a transmission path of an incident planar wave, can increase the maximum transmission distance of the generated bessel beamby multiple magnitudes, can be applied to long-range high-resolution imaging and detection, and has important actual application significance.

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 axial position, 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 optical devices used to generate Bessel beams, such as annular slit-lenses, computer holograms, spherical aberration lenses, axi...

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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