Adjustable ring vector light beam producing system

Abstract

The invention relates to an adjustable ring-shaped vector beam generating system. The prior art has high incident beam requirements, and cannot realize the ring-shaped vector beam and the beam size adjustment. In the invention, the incident beam sequentially passes through a beam expanding shaper, an external reflection circular conical surface reflector, a cylindrical curved polarizer, an internal reflection circular conical surface reflector, and two halfwave plates positioned in parallel; after a light source emergent beam passes through the beam expanding shaper and the external reflection circular conical surface reflector, a radial propagating beam is formed; a ring-shaped rotation vector polarized beam is formed by the reflection of the internal reflection circular conical surface reflector after the radial propagating beam passes through the cylindrical curved polarizer; the polarization state is changed by adjusting the optical axis angle of the two halfwave plates through a rotary motion part; and the transverse size of the beam is changed by adjusting the space between the external reflection circular conical surface reflector and the internal reflection circular conical surface reflector through an axial motion part. The invention has the advantages of low incident beam requirements, ring-shaped vector beam output, convenient beam polarization state and transverse size adjustment, etc.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a light beam generation system, in particular to an adjustable circular vector light beam generation system. It is mainly used in the fields of optical microscopy, laser micromachining, optical micromanipulation, optical information storage, and interaction between light and matter. technical background [0002] The rotating vector polarized beam refers to the beam whose transverse polarization state presents a symmetrical distribution of the rotational axis. It has special beam focusing properties and propagation characteristics, and can be applied to optical information storage, optical microscopy, lithography, laser processing, optical micromanipulation, Optical systems such as super-resolution, light-matter interaction, etc. For example, rotating vector polarized beams can be applied to optical microscopy systems to achieve super-resolution effects, because the focus of a cer...

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Problems solved by technology

In the prior art, there is an adjustable vector beam shaping system that can generate rotating vector polarized beams (see Chinese invention patent "Adjustable Vector Beam Shaping System", patent number: ZL200410052913.4), the adjustable vector beam shaping system It has considerable advantages, but there are still some essential deficiencies, mainly: 1) if the prior technology is used to generate the rotation vector polarized beam, the necessary condition is that the incident beam of the system needs to be a special form of the rotation vector polarized beam, such as Radial polarized beams or azimuth polarized beams, however, the generation of radially polarized beams and azimuth polarized beams also belongs to the category of rotating vector polarized beams. The vector polarized beam essentially determines that it is impossible to realize the conversion process of the incoherent incident beam to the rotating vector polarized beam, and the requirements for the incident beam are high; 2) It is impossible to realize the transverse beam expansion effect of the outgoing beam relative to the incident beam, and it is impossible to adjust the shape of the outgoing beam The size limits the scope of application; 3) It is impossible to realize the annular light vector beam, and the use efficiency of the high numerical aperture area of ​​the focusing objective lens in the focusing optical system is low

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