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Vector light field converter and polarized light converting method

A technology of vector light field and linearly polarized light, which is applied in the direction of polarizing elements, optical elements, instruments, etc., can solve the problems of low optical damage threshold of liquid crystal, complex device processing, complex adjustment, etc., and achieve compact structure, high optical damage threshold, The effect of facilitating industrialization

Active Publication Date: 2012-12-19
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the eigenstate of the laser generated by the laser is linearly polarized or circularly polarized, when it generates a vector light field, the efficiency is low and complex adjustments are required
At present, more studies on external adjustment are based on the conversion of the polarization of light by liquid crystal materials. However, the processing of such devices is relatively complicated and the optical damage threshold of liquid crystals is generally low, which determines that such devices are not suitable for use in high-power-density lasers. apply in

Method used

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  • Vector light field converter and polarized light converting method
  • Vector light field converter and polarized light converting method

Examples

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Effect test

Embodiment 1

[0042] A vector light field conversion device is a polarization modulation optical element composed of a light-rotating crystal whose light transmission length changes helically.

[0043] An optically active crystal 101 cut along the optical axis and having a specific thickness distribution, with a structure such as figure 1 As shown, the optically active crystal is cut along the direction of its optical axis, and the thickness measured in the direction of the optical axis of the optically active crystal, that is, the distribution of the optical length is variable, and the optical length is a spiral change, and the variation function is: or where z 0 is the length of the non-rotating part, is the cylindrical angular coordinate, z s is the length of the helical part; the polarization direction of the linearly polarized light passing through the optically active crystal rotates with the action length, and the rotation angle is or Among them, ρ is the optical rotation rat...

Embodiment 2

[0045] A vector light field conversion device with a structure such as figure 2 As shown, it includes the optically active crystal 202 with a helically changing light transmission length described in Embodiment 1 and a wave plate 203 placed behind the optically active crystal along the optical path direction, and the two are fixed by a fixing sleeve 204 . Wherein, the helical part of the optically active crystal 202 faces the positive direction of the z-axis, and the non-helical part faces the negative direction of the z-axis. Both the plane surface 201 of the optically active crystal and the incident surface of the wave plate can be coated with an anti-reflection film to increase the transmittance of incident light.

[0046] The fixing sleeve 204 is used to fix the optical active crystal and the wave plate. The material can be made of stainless steel, and the surface is treated with black chrome matte to prevent laser reflection (the matte effect is especially suitable for ...

Embodiment 3

[0048] Embodiment 3. Vector light field conversion device and method for generating radially polarized light using a vector light field conversion device

[0049] Such as Figure 4 As shown, the vector light field conversion device with a structure as in Example 2 is adopted, including an optically active crystal processed along the optical axis direction and a full wave plate 403 (the thickness of the wave plate is 4mm, and the general wave plate on the market is adopted, including a fixed wave plate The thickness of the metal frame is about 8 mm); the full-wave plate 403 is a wave plate that can perform 2π phase delay on the wavelength of the required conversion light field, and the radius of the full-wave plate is the same as that of the optically active crystal; the optically active crystal 402 is a quartz plate , its radius is 5mm, and its optical rotation rate for a laser with a wavelength of 1064nm is 10.4° / mm. The quartz plate is cut along the optical axis, and the th...

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Abstract

The invention relates to a vector light field converter and a polarized light converting method. The vector light field converter is formed by an optical crystal device and / or a wave plate, wherein the crystal length of the optical crystal device is in spiral change, thus a polarization direction passing through the optical crystal can be subjected to rotation, the radial polarized light output can be obtained, the conversion from the radial polarization to the angular polarization can be realized when a half of the wave plate is placed at the back part of the optical crystal device, and the angular polarized light output can be obtained. The vector light field converter disclosed by the invention has the advantages that the cost is low, the converting efficiency is high, the light damage threshold is high, and the like. The vector light field converter and the polarized light converting method, disclosed by the invention, have important application prospect in optics respects such as quantum optical communication, cold atom trapping, dynamic optical storage, quantum computing and material processing.

Description

technical field [0001] The invention relates to a vector light field conversion device, which belongs to the field of laser technology and devices. Background technique [0002] With the development of science and technology, due to its directionality, coherence and high energy, laser has shown great power in the fields of scientific research, national defense and national economy. In this field, linearly polarized laser is easier to realize, and it is also the most widely studied and applied type of laser. [0003] When the laser interacts with matter, since the matter has different responses to different polarizations, this also determines the important requirement for circularly symmetrically polarized lasers in the direction of laser propagation. In addition, due to the special symmetry of the polarization direction, this type of polarized laser has irreplaceable advantages in the fields of optical communication, dynamic optical storage, quantum computing, and particle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/28G02F1/01G02B5/30
Inventor 于浩海王奕程张怀金王正平王继扬
Owner SHANDONG UNIV
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