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A multi-orbital angular momentum beam generator and its preparation method

A technology of orbital angular momentum and angular momentum, applied in the directions of instruments, optics, optical components, etc., to achieve the effects of easy preparation, high beam quality, and easy integration

Active Publication Date: 2021-05-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, how to simply and efficiently generate multiple three-dimensional spatially distributed OAM modes using a single device is still very challenging.

Method used

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  • A multi-orbital angular momentum beam generator and its preparation method
  • A multi-orbital angular momentum beam generator and its preparation method
  • A multi-orbital angular momentum beam generator and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Fabrication of multi-orbital angular momentum beam generators with micron-scale dual-region division.

[0057] Using the design method of sub-area phase independent control, a multi-orbital angular momentum beam generator with micron-scale dual-area division is designed. The device is precisely prepared by femtosecond laser additive manufacturing technology, with continuous surface profile and high beam quality, so that Multiple orbital angular momentum modes with opposite rotation directions are generated at different positions on the optical axis.

[0058] A method for preparing a multi-orbital angular momentum beam generator with micron-scale dual-area division, the specific steps are as follows:

[0059] (1) Phase distribution information of the multi-orbital angular momentum beam generator:

[0060] Specific steps: use the focusing element logarithmic plane axis cone lens to generate the focusing phase, and use the spiral phase plate to generate the spiral phase. ...

Embodiment 2

[0074] Fabrication of multi-orbital angular momentum beam generators with micron-scale three-region division.

[0075] Using the design method of independent phase control in sub-regions, a multi-orbital angular momentum beam generator with micron-scale three-region division is designed. The device is precisely prepared by femtosecond laser additive manufacturing technology, and has a continuous surface profile and high beam quality. Multiple desired orbital angular momentum modes are generated at different positions on the optical axis.

[0076] The design and preparation of a multi-orbital angular momentum beam generator divided into three regions on the micron scale, the specific steps are as follows:

[0077] (1) Phase distribution information of the multi-orbital angular momentum beam generator:

[0078] Specific steps: use the focusing element logarithmic plane axis cone lens to generate the focusing phase, and use the spiral phase plate to generate the spiral phase. By...

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Abstract

The invention discloses a multi-orbital angular momentum beam generator and a preparation method thereof, belonging to the field of functional micro-optical elements and preparation, including phase distribution information, processing data conversion, preliminary preparation, and multi-track multi-orbital angular momentum beam generator The preparation, development and drying of the angular momentum beam generator; the whole device is divided into multiple independent areas according to the principle of equal radius division through the method of sub-area division and independent phase control, and each area is passed through the focusing element spherical or aspheric lens A focused phase is produced, and a helical phase is produced by a helical phase plate. By combining the two, a combined multi-OAM beam generator is obtained, which finally generates multiple OAM modes at different positions of the optical axis. The multi-orbital angular momentum beam generator of the present invention has the advantages of generating multiple spatially distributed orbital angular momentum modes, simple structure, easy preparation, programmable design, wide applicability, and easy integration with various existing optical systems.

Description

technical field [0001] The invention belongs to the technical field of functional micro-optical elements and its preparation, and in particular relates to a simple and universal multi-orbital angular momentum beam generator and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of information technology in modern society, people's demand for information continues to increase, and traditional information communication and storage capacity have reached a bottleneck. Different from the finite dimensions of electrons, photons have multiple dimensions. In the process of traditional optical information encoding, information is encoded and modulated mainly in four dimensions: time, wavelength, phase, and polarization. In theory, the orbital angular momentum of photons can obtain infinitely many eigenvalues, which can greatly expand the capacity of optical communication and information storage. Therefore, taking photon orbital ang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09
CPCG02B27/095G02B27/0955
Inventor 孙洪波胡志勇陈岐岱
Owner JILIN UNIV