System and method for generating polarization transmission invariant light field

Abstract

The invention discloses a system and a method for generating polarization transmission invariant light field. The system comprises a laser light source, a spatial light modulator, a computer, a first lens, a shading element, a first quarter-wave plate, a second quarter-wave plate, a second lens and a light beam synthesis element. According to the system and the method for generating the polarization transmission invariant light field, two Laguerre Gaussian mode light beams meeting a certain Gouge order relation are generated, orthogonal uniform polarization is given to the two Laguerre Gaussian mode light beams, then the two Laguerre Gaussian mode light beams are focused on a Ronchi grating, and the polarization transmission invariable light field is stably synthesized. The cross section of the generated light field has linear polarization, elliptical polarization and circular polarization at the same time, and in the transmission process of the light field in a free space, besides normal light spot size scaling, polarization distribution does not change.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a system and method for generating a polarization transmission invariant light field. Background technique [0002] With the development of science and technology and social progress, the regulation and application of light field has penetrated into all aspects of military industry, medical treatment and life, and polarization, as an important degree of freedom in light field research, has always been of high research value. At the beginning of the 19th century, Marius first discovered the polarization of light. After a long period of time, people's understanding of the polarized light field mainly focused on the polarized light field of the uniform distribution line of the polarization state, the circularly polarized light field, and the elliptically polarized light field. The study of uniformly polarized light fields has produced numerous applications in the fields of eliminat...

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Problems solved by technology

[0013] 3. Although the full Poincaré vector light field and the hybrid Poincaré spherical vector light field have linear polarization, elliptical polarization, and circular polarization at the same time in the cross section, there is a large difference between the fundamental modes of the synthetic light field , each of them changes in different ways during transmission, so the polarization of the synthesized light field will continue to change during transmission, which is not conducive to the transmission of optical information;

[0014] 4. The existing light field cannot simultaneously satisfy the two conditions of having all types of polarization and ensuring that the transmission of the polarization state remains unchanged

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