A parameter-adjustable Bessel beam generating device and its generating method

Abstract

The invention discloses a bessel light beam generating device with adjustable parameters and a production method of the bessel light beam generating device. The bessel light beam generating device comprises a continuous wave laser device, wherein a light beam emitted from the continuous wave laser device is reflected by a total reflective mirror, enters a filter, and then is collimated by a convex lens; the collimated light beam passes through a polarizer, becomes into a linearly polarized light and irradiates on a beam-splitting cube; a reflected light which passes through the cube irradiates on a reflected spatial light modulator, is reflected by the reflected spatial light modulator and then generates a vortex light beam; the vortex light beam passes through the beam-splitting cube and a polarization analyzer, and then irradiates on the diaphragm; the vortex light beam which passes through the light diaphragm vertically irradiates on a transmission-type spatial light modulator, passes through the transmission-type spatial light modulator and then generates a bessel light beam; the bessel light beam is imaged in a CCD (charge coupled device) camera, and is stored in a computer, so as to be analyzed. The device disclosed by the invention has the advantages of concise principle and low cost; the parameters can be subjected to real-time online adjustment; the device can be widely applied to the fields such as particle light control and optical test.

Description

technical field [0001] The invention relates to a Bessel beam generating device and a generating method, in particular to a Bessel beam generating device and a beam generating method whose parameters can be flexibly adjusted, which can be widely used in the fields of particle light manipulation, optical testing, etc. . Background technique [0002] Bessel beams are a special set of solutions to the scalar wave equation in free space, whose light field distribution has the form of a Bessel function of the first kind. In 1987, J. Durnin first proposed the non-diffraction characteristics of Bessel beams, and called Bessel beams non-diffraction beams. Bessel beams have important application prospects in the fields of micro-manufacturing, micro-nano optics, and optical tweezers, especially in the manipulation of ultracold particles. In reality, there is no light source that directly emits Bessel beams. Therefore, how to generate high-quality Bessel beams with adjustable paramet...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the analysis that in the existing technology for generating Bessel beams, there is still a lack of a real-time online adjustable generation device and method for Bessel beam parameters

Images