A Laser Dynamic Focusing System Based on Parabolic Mirror Folding Optical Path

Abstract

The invention discloses a laser dynamic focusing system based on a parabolic mirror folding optical path. The multi-reflecting mirror laser dynamic focusing system based on a variable optical path is composed of a parabolic mirror folding optical path system, a laser guiding mirror and a focusing lens group. The present invention adopts the folded optical path composed of the plane reflector and the parabolic reflector to realize the transformation of the incident laser light of the system, that is, to change the divergence angle of the outgoing laser light. The folded light path includes a moving mirror driven by a rotating motor. The change of the inclination angle of the moving mirror can change the divergence angle of the laser light emitted from the folded light path, and then obtain different focus positions after being focused by the focusing lens. The invention adopts a single mirror driven by a rotating motor to realize dynamic focusing, has the characteristics of fast zooming speed, and can realize high-speed zooming synchronously with the scanning vibrating mirror.

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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