Generating device for radial polarized light

Abstract

The invention belongs to the application optical field, and in particular relates to a generating device for radial polarized light applied to the optical tweezer technology particle capturing, surper resolution microscope, laser processing, and optical information storage. The generating device for radial polarized light comprises a first optical fiber, a second optical fiber, a single-mode laser light source, a polarizer, a first optical power coupler, a third optical fiber, a fourth optical fiber, a first optical fiber polarization state modulator and a second optical fiber polarization state modulator, a second optical power coupler, a fifth optical fiber and an imaging device. The generating device for radial polarized light is the all-fiber device, one beam of light with LP11 mode is stimulated, the light with LP11 mode is divided into two paths through the optical coupler for modulating the polarization state respectively, two paths of light with LP11 mode can be overlapped through the optical coupler, the optical fiber pattern theory and the coupling theory are combined and the space optical path system is not built, and the polarization controller is controlled for generating the polarized light different in vector.

Description

technical field [0001] The invention belongs to the field of applied optics, and in particular relates to a radially polarized light generating device used in optical tweezers technology particle capture, super-resolution microscopy, laser processing, and optical information storage. Background technique [0002] Axisymmetrically polarized beam is a spatially variable linearly polarized beam with axisymmetric characteristics. The local polarization state is still linearly polarized, but the polarization orientation at different positions on the cross section is changed. Based on the different distributions of polarization states, various forms of axisymmetrically polarized beams have been proposed, such as radially polarized light, angularly polarized light, and helically polarized light. Radial polarized light is a typical polarization state of axisymmetric polarization. It has an axisymmetric polarization structure and a hollow ring mode distribution. When a lens with a hi...

AI Technical Summary

Problems solved by technology

The intracavity method is to directly generate axisymmetrically polarized beams by setting polarization-selective optical elements in the laser resonator, which can generate relatively stable radial / angularly polarized light, but most of them require special manufacturing techniques and rigorous precision. design

The extra-cavity method is achieved by switching outside the resonant cavity, but the switching devices are usually very complex and expensive

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