Optical system for generating approximate diffraction-free zero-order Mathieu beam

Abstract

The invention discloses an optical system for generating an approximate diffraction-free zero-order Mathieu beam. The optical system for generating the approximate diffraction-free zero-order Mathieu beam comprises an optical platform, a laser device is arranged on the optical platform, and a cylindrical lens, a short focal length lens, a long focal length lens and an axicon are arranged along the light path of the laser device, wherein the short focal length lens is arranged nearby the focus of the cylindrical lens, and the focus of the short focal length lens and the focus of the long focal length lens are overlapped. The optical system can generate the approximate diffraction-free zero-order Mathieu beam, and provides a simple and effective new approach for obtaining the zero-order Mathieu beam. The beam can be applied to the fields of laser material processing, collimation measurement, optical wireless communication and the like.

Description

technical field [0001] The invention relates to the field of optics, in particular to an optical system for generating an approximately non-diffraction zero-order Mathieu beam. Background technique [0002] The concept of the non-diffraction beam was proposed by Durnin in the United States in 1987, and it has received a lot of attention because its light intensity distribution in the propagation direction does not change with the propagation distance. The non-diffraction beam is a set of special solutions to the space free scalar wave equation. The well-known Bessel beams (Bessel beams) are a set of solutions of the wave equation in the cylindrical coordinate system. If the wave is solved in the elliptic cylindrical coordinate Equation, you can get another set of solutions, which is Mathieu beams (Mathieu beam). Like non-diffraction Bessel beams, Mathieu beams can also be used in optical measurement, optical plate making, medical imaging, nonlinear optics and optical wirele...

AI Technical Summary

Problems solved by technology

However, the computer holography method needs to use a computer and a spatial light modulator, which is costly and complex. The laser resonator method is difficult to debug the laser cavity and the equipment cost is high. The annular slit lens method is simple, but the aperture is small and the light energy Low utilization, thus not conducive to practical application of Mahtieu beams

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