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Intensive laser Airy beam modulation method and device based on double-amplitude diffractive element

A diffractive element, Airy beam technology, applied in diffraction gratings, optical elements, optics, etc., can solve problems such as low modulation power

Active Publication Date: 2019-12-03
THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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  • Application Information

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Problems solved by technology

At present, the modulation technology of the existing strong laser Airy beam completely depends on the modulation device, usually using the spatial light modulator, which has the obvious disadvantage of low modulation power

Method used

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  • Intensive laser Airy beam modulation method and device based on double-amplitude diffractive element
  • Intensive laser Airy beam modulation method and device based on double-amplitude diffractive element
  • Intensive laser Airy beam modulation method and device based on double-amplitude diffractive element

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with embodiment:

[0045] Such as image 3 As shown, the strong laser Airy beam modulation method based on the dual-amplitude diffraction element includes the following steps,

[0046] Such as figure 1 The schematic diagram of the principle optical path is shown, and the steps for designing the modulation optical path of the strong laser Airy beam are as follows: After the laser beam is expanded by the lens group, it passes through the double-amplitude diffraction element, that is, two amplitude diffraction elements. The distance between the two is usually within one meter. Then through the beam expander, the focused Airy spot is formed in the target light field in the far field;

[0047] Steps to design the amplitude type diffraction element: design the amplitude type diffraction element that meets the design requirements according to the known target light field. modulation into an Airy beam;

[...

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Abstract

The invention discloses a strong-laser Airy beam modulating method based on double vibration-amplitude type diffraction elements. The method comprises the steps of designing a strong-laser Airy beam modulating optical path, designing vibration-amplitude type diffraction elements, manufacturing the vibration-amplitude type diffraction elements and modulating the optical path. The two vibration-amplitude type diffraction elements are utilized for performing phase modulation on the strong laser. An Airy light spot is obtained in a far target optical field. The strong-laser Airy beam modulating optical path is firstly designed. Then the vibration-amplitude type diffraction elements which satisfy a designing requirement are designed according to the known target optical field, and then the vibration-amplitude type diffraction elements are manufactured. Then the optical path which comprises a laser device, a lens set, the vibration-amplitude type diffraction elements and a beam expanding lens is adjusted. The laser device emits laser, and finally a focused Airy light spot is formed in the target optical field. A defect of low modulation power through using a spatial light modulator in existing strong-laser Airy beam modulating technology is overcome.

Description

technical field [0001] The invention relates to the field of strong laser Airy beam modulation, in particular to a strong laser Airy beam modulation method and device based on a double-amplitude diffraction element. Background technique [0002] Airy beams have the characteristics of self-bending transmission, no diffraction, and self-healing. Free acceleration means that the trajectory of Airy beams during free space transmission is similar to the free acceleration generated when objects are projected under the action of a gravitational field. trajectory; no diffraction, means that the shape of the light field intensity distribution remains approximately unchanged during the propagation process; self-healing, means that during the propagation of the Airy beam in free space, if part of the light spot of the Airy beam is blocked, After a transmission distance, the shape of the light intensity distribution will gradually return to the shape before being blocked. These unique ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B5/18G02B27/42
CPCG02B5/1847G02B27/0012G02B27/4233
Inventor 闫力松李强姜永亮许伟才王玉雷兰硕杨小威李梦庆胡海力
Owner THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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