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Compact Airy beam phase plate and manufacturing method thereof

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

Active Publication Date: 2020-04-10
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 manufacturing method thereof
  • Compact Airy beam phase plate and manufacturing method thereof
  • Compact Airy beam phase plate and manufacturing method thereof

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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

The invention discloses a compact Airy beam phase plate and a manufacturing method thereof. The manufacturing method comprises the following steps: calculating a transmittance factor of a focusing lens; and directly superposing the cubic phase of the three-dimensional phase surface with the transmittance factor of the focusing lens to realize the phase design of the Airy phase plate, and manufacturing the Airy beam phase plate according to the design scheme. The self-accelerating Airy light can be directly generated by using an independent phase plate, and the combination of a cubic phase anda focusing lens is not needed, so that the structure is more compact, and miniaturization and integration are easier. The problem that self-accelerating Airy light is generated on the microcosmic scale is solved. Two characteristic parameters, namely a cubic phase constant k0 and a lens focal length f, in the manufacturing process can be freely selected, so that the Airy beam with the adjustable self-acceleration bending degree and the adjustable main lobe size is obtained, and good flexibility is achieved.

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 Applications(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
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