An axial focusing system based on an acousto-optic deflector, a three-dimensional scanning device and a scanning method

By combining an acousto-optic deflector and optical path adjustment module with a lens and prism design, the problems of slow axial scanning speed and high customization cost are solved, realizing fast and low-cost 3D scanning.

CN122284187APending Publication Date: 2026-06-26HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610461820.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-09
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing axial scanning technology has a slow response speed, limited applicability, and high customization costs, making it difficult to achieve fast and widespread 3D scanning.

Method used

An axial focusing system based on an acousto-optic deflector is adopted. The defocus amount, which changes with the deflection angle of the acousto-optic deflector, is introduced through an optical path adjustment module. Combined with lenses and prisms, axial scanning is achieved. Based on the two-dimensional lateral deflection system, a refocusing lens is added to extend it to three-dimensional scanning.

Benefits of technology

It achieves extremely rapid, inertia-free axial scanning of lasers, expanding its application range and application scenarios, reducing system costs, and providing three-dimensional spatial scanning capabilities.

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Abstract

This invention discloses an axial focusing system, a three-dimensional scanning device, and a scanning method based on an acousto-optic deflector, belonging to the field of laser-related technology. The axial focusing system based on an acousto-optic deflector introduces a defocusing amount that changes with the deflection angle of the acousto-optic deflector through a prism. When the deflection angle of the acousto-optic deflector changes, the propagation distance of the beam in the axial focusing system is altered, thereby changing the effective focal length of the equivalent lens. The axial displacement of the beam waist position of the emitted beam changes according to the defocusing amount. Therefore, by adjusting the driving frequency of the acousto-optic deflector, the deflection angle of the beam by the acousto-optic deflector can be adjusted, thus changing the defocusing amount of the axial focusing system and achieving dynamic and rapid axial focusing of the laser.
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