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Compact airy beam phase plate and method of manufacturing the same

An Airy beam and manufacturing method technology, applied in the field of information optics, can solve problems such as difficult miniaturization, and achieve the effect of compact structure, good flexibility, and easy miniaturization

Active Publication Date: 2021-10-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method of generating Airy light requires at least twice the lateral length of the focal length, which is difficult to miniaturize
The generation of self-accelerating Airy light at the microscopic scale requires not only the cubic phase modulation of the beam wavefront at the micron scale, but also a lens with a micron-scale aperture and focal length for focusing, which is a very challenging technology.

Method used

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  • Compact airy beam phase plate and method of manufacturing the same
  • Compact airy beam phase plate and method of manufacturing the same
  • Compact airy beam phase plate and method of manufacturing the same

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Embodiment 1

[0049] According to the design of the present invention, the cubic phase constant k can be produced 0 Airy phase plate of 7 μm and lens focal length f of 60 μm, such as Figure 4 shown. The manufactured Airy phase plate can be prepared by femtosecond laser direct writing three-dimensional processing technology. In order to ensure a good processing effect, a cylindrical base with a thickness of 2 μm is added to the bottom of the phase plate to compensate for the initial position error of the z-direction processing;

[0050]Based on the manufacturing of the phase plate of the present invention, different phase modulation depths can be manufactured for different laser light source wavelengths and materials. In Example 1, the green light source with a wavelength of 532nm is manufactured, the maximum phase modulation depth is 4π, and the refractive index of the polymer material used is 1.505, therefore, the maximum height of the phase plate fringes is 2.11 μm.

Embodiment 2

[0052] In the manufacturing method of the phase plate in the present invention, both characteristic parameters can be adjusted freely, so as to generate Airy beams with different characteristics. for k 0 = 7.5 μm, f = 60 μm, k 0 = 7.5 μm, f = 50 μm and k 0 = 9.5 μm, f = 40 μm three parameters of phase plate manufacturing and femtosecond laser three-dimensional processing effect as follows Figure 5 shown.

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Abstract

A compact Airy beam phase plate and its manufacturing method, the manufacturing method includes the following steps of calculating the transmittance factor of the focusing lens; directly superimposing the cubic phase of the stereoscopic phase surface on the transmittance factor of the focusing lens, that is, realizing The phase design of the Airy phase plate, and manufacture the Airy beam phase plate according to this design scheme. The present invention can use a single phase plate to directly generate self-accelerating Airy light without the combination of cubic phase and focusing lens, making the structure more compact and easier to miniaturize and integrate. The invention solves the difficult problem of generating self-accelerating Airy light on a microscopic scale. Two characteristic parameters in the manufacture of the present invention: cubic phase constant k 0 and the focal length f of the lens can be freely selected, so as to obtain an Airy beam with adjustable self-accelerating bending degree and main lobe size, which has good flexibility.

Description

technical field [0001] The invention relates to the technical field of information optics, in particular to a compact Airy beam phase plate and a manufacturing method thereof. Background technique [0002] In 2007, American scientists Georgios A.Siviloglou and Demetrios N.Christodoulides proposed self-accelerating Airy beams, and obtained finite-energy Airy beams with parabolic trajectories experimentally for the first time. Since then, research on Airy Light has been extensively carried out. Compared with other vector beams, Airy light has unique properties, including long-distance non-diffraction-free, self-healing and lateral secondary self-accelerating ballistic trajectory. Airy light has important application prospects in the fields of light manipulation, sheet light microscopy, laser filamentation, and laser processing. So far, the generation of Airy light mainly relies on the modulation of the cubic phase wavefront of the beam, and then through the Fourier transform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09G02B27/00
CPCG02B27/0012G02B27/0938
Inventor 胡衍雷蔡泽吴东李家文褚家如
Owner UNIV OF SCI & TECH OF CHINA