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Phase coded Fresnel lens

A Fresnel lens, phase encoding technology, applied in the field of Fresnel lens, can solve problems such as chromatic aberration

Active Publication Date: 2019-01-04
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the serious problem of chromatic aberration when traditional Fresnel lenses are used for imaging

Method used

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Effect test

Embodiment 1

[0026] A phase-encoded Fresnel lens such as figure 1 As shown, the surface shape of its surface is the integration of the converging lens surface shape and the phase encoding element surface shape, and the sagittal height difference between the highest point and the lowest point of each ring zone on the phase encoding Fresnel lens is Where λ is the design wavelength, and n is the refractive index of the base material of the phase-encoded Fresnel lens.

Embodiment 2

[0028] An imaging method of a phase-encoded Fresnel lens, characterized in that: the object is subjected to phase modulation by the above-mentioned phase-encoded Fresnel lens, so that the information of the object can be preserved, and the blurred image is restored to a clear image by image restoration technology. Specifically, an ordinary spherical lens is selected as the converging lens, and its surface shape is The cubic phase encoding plate is selected as the phase encoding element, and its surface shape is The selected spherical lens and the tertiary phase plate should have the same caliber. Shape Z 1 with face shape Z 2 Integrate to get the integrated surface shape Collapsing the integrated surface shape, so that the difference in sagittal height between the highest point and the lowest point of each annulus is Finally, the surface shape of the three-phase encoded Fresnel lens is obtained, and its equation is And Z≥0, m=1, 2, 3..., in the formula, x m ,y m is...

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Abstract

The invention belongs to the optical field, aims at solving the technical problem of serious chromatic aberration when the traditional Fresnel lens is used for imaging, and discloses a phase coded Fresnel lens. The phase coding technology is introduced to the field of the Fresnel lens. The surface shape of the phase coding element and the surface shape of the converging lens are integrated and then collapsed so that the vector height difference between the highest point and the lowest point of each ring band is lambda / (n-1), and finally the surface shape of the phase coded Fresnel lens is obtained, wherein lambda is the design wavelength and n is the refractive index of the base material. The phase coded Fresnel lens has the focusing function of the traditional diffraction imaging lens andalso has the phase coding function of the phase coding element. The Fresnel lens designed by this method can perform phase coding on the incident light so as to broaden the focal depth, reduce the sensitivity of the Fresnel lens to the wavelength and broaden the bandwidth of the Fresnel lens without reducing the imaging resolution of the Fresnel lens.

Description

technical field [0001] The invention belongs to the field of optics, and in particular relates to a Fresnel lens. Background technique [0002] Fresnel lens is a new type of optical element invented by the famous French physicist Fresnel. He originally designed this lens in 1822 to build a lighthouse lens through which light could be seen from 20 miles away. Fresnel lens consists of a series of concentric prismatic grooves, also known as threaded lens. The essence of Fresnel lens is a kind of diffractive optical element. According to the difference of light modulation, it can be divided into amplitude type Fresnel lens and phase type Fresnel lens. The Fresnel zone plate belongs to the amplitude type Fresnel lens. In the manufacture of the Fresnel lens, in addition to the method of blocking the even wave band or the odd wave band, it can also be realized by the phase compensation method, that is, the phase Fresnel lens. lens. By reducing or increasing the thickness of the...

Claims

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Application Information

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IPC IPC(8): G02B3/08G02B5/18
CPCG02B3/08G02B5/1876
Inventor 许峰郑鹏磊胡正文王钦华邢春蕾
Owner SUZHOU UNIV
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