Method for generating random column vector polarized beams by single liquid crystal spatial light modulator

Abstract

Disclosed is a method for generating random column vector polarized beams by a single liquid crystal spatial light modulator. A light beam generating system is composed of a laser device, a liquid crystal spatial light modulator, a battery of lenses, a lambada / 2 wave plate, lambada / 4 wave plates, a horizontal polarizing film, a triple prism, a reflector, a beam zooming device and the like. Linearly polarized light in a random polarization direction is incident, light beam amplification is achieved after the battery of lenses, the lambada / 2 wave plate can be used for adjusting the polarization direction of the linearly polarized light, horizontal line polarized beams are guaranteed to be obtained through the polarizing film transmitted in a horizontal direction, and beam intensity can also be adjusted by combining the lambada / 2 wave plate and the polarizing film. The horizontal line polarized beams pass through the liquid crystal spatial light modulator, then achieve space phase modulation, finally pass through a first lambada / 4 wave plate, the liquid crystal spatial light modulator and a second lambada / 4 wave plate in sequence by being reflected by the triple prism and the reflector, controls the polarization state of space light beams and generates the random column vector polarized beams. When the two lambada / 4 wave plates are removed, vortex beams can be generated. The method for generating the random column vector polarized beams by the single liquid crystal spatial light modulator is low in cost, high in purity, multiple in variety of generated light beams, simple in structure, easy to operate and control and wide in applied range.

Description

technical field [0001] The present invention relates to the technical field of spatially polarized beam shaping, in particular to converting linearly polarized beams into arbitrary cylindrical vector polarized beams, such as: radially polarized light, angularly polarized light, phase-adjustable radially polarized vortex beams, high-order diameter beams, polarized beams and vortex beams etc. Background technique [0002] Cylindrical vector polarized light is a special vector polarized light, whose spatial polarization state distribution is not uniform, but has certain symmetry or similarity about the optical axis. Axisymmetric beams belong to a type of cylindrical vector polarized light, including radially polarized light, angularly polarized light, etc., and have unique optical properties and applications due to the axisymmetric distribution of their polarization and phase on the cross-section of the beam. In addition, phase-tunable cylindrically symmetric beams, such as ra...

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Problems solved by technology

[0006] Although the coherent polarization manipulation method can produce high-purity radially polarized light, it has high requirements for the stability and precision control of the experimental optical path, and the operation and control are complicated; High, its utilization rate and application effect are limited; radially polarized light generated by optical fiber has limited application due to its small energy; both spatial light modulators and gratings can generate radially polarized light with high purity and high energy , its control unit has reached the micron level, and it is easy to operate and control, but the fabricated grating can only convert light beams of a certain wavelength into radially polarized light, which has narrow application range and high production cost

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