A method and device for generating radially polarized light beams

Abstract

The invention discloses a method and device for generating a radial polarization beam. The method is characterized by comprising the following steps: firstly carrying out polarizing beam splitting on a collimated beam to obtain a parallel line polarization beam and a perpendicular line polarization beam in an intensity ratio of 1:1, ensuring the parallel line polarization beam and the perpendicular line polarization beam to become circular polarization beams in opposite directions of rotation respectively, carrying out 0-2pi vortex phase encoding and reverse 0-2pi vortex phase encoding with the same starting point on the right-handed and left-handed circular polarization beams respectively and combining the two beams subjected to phase encoding and deflected by a light path to obtain the radial polarization beam. The device comprises a laser, a polarizing beam splitter, a first lambada / 4 wave plate, a second lambada / 4 wave plate, a 0-2pi vortex phase plate, a reverse 0-2pi vortex phase plate, light path deflection devices and a beam combination device, wherein the phase start lines of the 0-2pi vortex phase plate and the reverse 0-2pi vortex phase plate coincide. The method is easy to implement and the device has a simple structure, is easy to adjust, has low manufacturing cost and good stability and dispenses with other special optical elements.

Description

technical field [0001] The invention belongs to the field of applied optics, and specifically relates to a method and device for generating radially polarized light beams, which are mainly used in the fields of optical information storage, photolithography, super-resolution microscopy and the like. Background technique [0002] As a vector characteristic of light waves, polarization has attracted more and more attention in recent years, and it can be widely used in polarization difference imaging, super-resolution focusing, laser lithography and other fields. During the research, it was found that the polarization state of the beam not only includes the traditional linearly polarized light, circularly polarized light and elliptically polarized light, but also includes radial polarized light (radial polarization beam) and tangentially polarized light (azimuthally polarized beam), etc. Cylindrical polarized beams. Due to the symmetrical distribution of polarization state and ...

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Problems solved by technology

The Chinese invention patent application with publication number CN101465512A discloses a laser that produces cylindrically symmetric polarized light. Radial polarized light or tangentially polarized light is realized by designing a special asymmetric cavity structure. However, due to the need to change the existing laser Resonant cavity, thus high production cost

The Chinese utility model patent with the patent number ZL 200820165973.0 discloses a device for converting linearly polarized light into radially polarized light, but the adjustment is troublesome and requires high adjustment accuracy

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