Laser dynamic focusing system based on paraboloid reflector folded light path

Abstract

The invention discloses a laser dynamic focusing system based on a paraboloidal mirror folding optical path. The multi-mirror laser dynamic focusing system based on the variable optical path is composed of a paraboloidal mirror folded optical path system, a laser guide mirror and a focusing lens set. A folded light path composed of a plane mirror and a parabolic mirror is adopted to achieve conversion of incident laser of the system, namely, the divergence angle of emergent laser is changed. The folded light path comprises a movable reflector driven by a rotating motor; and the divergence angle of laser emitted by the folded light path can be changed through the change of the inclination angle of the movable reflector, and then different focusing positions are obtained after focusing of afocusing lens. The system realizes dynamic focusing by utilizing the single reflector driven by the rotating motor, has the characteristic of high zooming speed, and can realize high-speed zooming synchronous with the scanning galvanometer.

Description

technical field [0001] The invention relates to a novel laser dynamic focusing principle and system, which changes the divergence angle of laser light exiting the folded optical path of a parabolic reflector through the deflection of a single reflector to realize dynamic focusing, and belongs to the fields of optomechanical integration and laser processing. Background technique [0002] With the rapid development of laser technology, laser scanning technology is widely used in various fields such as surface processing, scanning imaging, rapid prototyping, plate cutting, drilling and so on. Among them, among various laser scanning technologies, galvanometer scanning technology is widely used due to its speed and accuracy. The traditional galvanometer scanning technology mainly combines XY dual-axis galvanometer scanning and field mirror (F-theta lens) to realize the plane range. However, this technology is limited by the field of view of the field lens and it is difficult to ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the dynamic focusing technology widely used at present mainly changes the distance between the lens elements of the laser focusing system on the optical path to realize the dynamic change of the focusing position. This method needs to control the movement of the lens along a straight line, and its motion control Compared with the two-dimensional galvanometer scanning, the driving and transmission methods are significantly different, which leads to a great difference in the dynamic performance between the dynamic focusing system and the two-dimensional scanning system, and it is difficult to achieve synchronous control between the two, and the lens is straight There is a large difference in the response speed between the motion and the rotation motion of the scanning galvanometer. The former is slow and has a long response time, which will ultimately limit the scanning speed of the overall 3D scanning system

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