A device and method for generating a perfect ig vortex beam

Abstract

The invention discloses a device for generating a perfect IG vortex light beam, and the device comprises a continuous wave laser. A light beam emitted by the continuous wave laser is reflected by a reflector to irradiate a collimation and beam expanding device, and the light beam collimated by the collimation and beam expanding sequentially passes through a polarizer and a beam splitting cube. The light beam reflected by the beam splitting cube irradiates a reflection-type spatial light modulator, and the light beam reflected by the reflection-type spatial light modulator irradiates the beam splitting cube again, and passes through the beam splitting cube to irradiate a small-hole diaphragm. The light beam passing through the small-hole diaphragm irradiates a polarization analyzer, and the light beam passing through the polarization analyzer irradiates a CCD camera through a convex lens. The beneficial effects of the invention are that the device and method can generate an elliptical perfect vortex light beam, wherein the parameters of the elliptical perfect vortex light beam can be freely regulated and controlled in real time in an online manner, and the radius of the elliptical perfect vortex light beam cannot change with a topological charge value.

Description

technical field [0001] The invention relates to the fields of particle light manipulation and optical testing, in particular to a device and method for generating perfect IG vortex beams. Background technique [0002] Vortex beams have a wide range of applications in optical trapping and manipulation of tiny particles. It has become a very important research hotspot in the field of information optics in recent years. But the size of the dark spot in the center of the ordinary vortex beam increases with the increase of the topological charge value. However, in the application of trapping and manipulating particles related to optical vortex, it is often desired to obtain large topological charge and small central dark spot at the same time. In order to solve this problem, in 2013, Andrey S. Ostrovsky et al. proposed the concept of a perfect vortex, the radius of the bright ring of the vortex beam does not depend on the topological charge value [Opt. Lett. 38, 534 2013]. How...

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Problems solved by technology

[0004] To sum up, in the field of vortex beam research, there is still a lack of a device and method for generating an elliptical vortex beam whose radius does not change with the topological charge value (that is, a perfect IG vortex beam) that can be used for particle manipulation.

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