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Vortex light generating device and manufacturing method thereof

A technology for generating devices and manufacturing methods, applied in optics, optical components, instruments, etc., can solve the problems of low conversion efficiency of vortex light, phase distortion, poor purity, etc., to improve conversion efficiency, eliminate phase distortion, and improve conversion purity. Effect

Pending Publication Date: 2021-07-02
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Fresnel loss caused by the non-coating of the transmissive spiral phase plate is inevitable, and the coating is easy to cause phase distortion
Resulting in lower vortex light conversion efficiency and poorer purity

Method used

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  • Vortex light generating device and manufacturing method thereof
  • Vortex light generating device and manufacturing method thereof
  • Vortex light generating device and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Manufacturing a vortex light generating device, comprising the steps of:

[0033] (1) Grinding and polishing the silica material glass substrate into a cylinder;

[0034] (2) Gold film is selected as the material of the reflective spiral phase plate, the wavelength λ of the incident laser is selected as 800nm; the topological charge l is selected as 1;

[0035] (3) The ambient material of the reflective spiral phase plate is air, and the refractive index of air is known to be 1.00028;

[0036] (4) It is known that the refractive index of the gold film is 1.183, and the difference between the refractive index of the air and that of the air results in Δn of 0.342;

[0037] (5) Bring Δn, λ and l into the formula H=lλ / Δn, and H can be obtained as 4.378um;

[0038] (6) Plating reflective films of different heights on the substrate from low to high in the counterclockwise direction to form stepped steps, that is, to complete the manufacture of a vortex light generating devi...

Embodiment 2-4

[0043] The raw materials and manufacturing methods used in the vortex light generating device manufactured in Examples 2-4 are the same as in Example 1, except that different step numbers, radial numbers and topological charges of the helical phase plate are selected, these The manufacturing parameters of the vortex light generating device in the embodiment and the performance parameters after the experiment are shown in Table 1.

[0044] Table 1 Conversion purity table of the spiral phase plate with p=0

[0045]

[0046] As shown in Table 1, it can be seen from the table that as the number of steps of the spiral phase plate increases, the conversion efficiency and conversion purity of the vortex laser gradually increase. When the topological charge of the spiral phase plate is 1 and the radial direction is 0, the spiral phase plate The number of steps is from 16 to infinity, and the conversion efficiency of the spiral phase plate is only increased by 1%. However, the manuf...

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PUM

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Abstract

The invention discloses a vortex light generating device and a manufacturing method thereof. The vortex light generating device comprises a substrate and a reflection spiral phase plate, wherein the substrate is a flat cylindrical glass substrate; the reflection type spiral phase plate is composed of not less than three fan-shaped steps with equal height difference and equal radius, the central angles of all the steps are equal, and the sum of the number of circle center angles is 360 degrees; the central axis of the step and the central axis of the substrate are collinear; and the steps are arranged clockwise or anticlockwise from low to high and are plated by reflection films. According to the vortex light generating device, Fresnel loss caused when a traditional light conversion device is not coated or phase distortion caused when an antireflection film is coated is fundamentally eliminated, an operator only needs to convert steps of different heights to convert incident light of different wavelengths into vortex light, the application range is widened, the application of the device in broadband is realized, and the conversion efficiency and the conversion purity are improved. The manufacturing method of the vortex light generating device is mature in process, simple in step, low in energy consumption and easy to operate.

Description

technical field [0001] The invention relates to the field of vortex lasers, in particular to a vortex generating light device and a manufacturing method thereof. Background technique [0002] Because the traditional vortex light generating device can turn parallel light into vortex light carrying angular momentum, this vortex light has a good effect in the fields of optical tweezers, ion manipulation, quantum communication, etc., especially for those who cannot easily change the laser light. High-power laser users with front-end or mid-amplified cavity modes are very attractive. However, the traditional vortex light generation device uses the characteristics of different thicknesses of the helical phase wave plate at different azimuth angles to realize the phase distribution on the cross-section of the transmitted wave. The Fresnel loss caused by the non-coating of the transmissive spiral phase plate is inevitable, and the coating is easy to cause phase distortion. As a re...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B27/00
CPCG02B5/3083G02B27/0012
Inventor 赵永光周晶晶王占新何跃高庆岗刘莹
Owner XUZHOU NORMAL UNIVERSITY