Laser processing method for cutting frosted brittle material by using Bessel beam

Abstract

The invention belongs to the field of laser cutting, specifically relates to a laser processing method for cutting a frosted brittle material by using a Bessel beam. The method comprises the followingsteps of: adding light-transmitting liquid which is not easy to volatilize on the upper surface of an area to be cut of the frosted brittle materials; covering a light glass cover to eliminate bubbles between the light glass and the frosted brittle materials; and then placing the frosted brittle materials on a processing platform; adjusting an optical focusing system to enable the Bessel beam toform a focusing spot and a focal depth required for cutting the frosted brittle material after passing through a 4f system, and moving the Z axis of the axis where the optical focusing system is located to enable the focus of the Bessel beam to fall on the frosted brittle material; setting a cutting path, moving the X axis and Y axis of the processing platform to process the frosted brittle material. The laser processing method provided by the invention ensures the perfection of the Bessel beam focusing system by adding light-transmitting liquid which is not easy to volatilize on the area to be cut, realizes cutting the frosted brittle materials, so the method is suitable for double-side frosted brittle materials.

Description

technical field [0001] The invention belongs to the technical field of laser cutting, and in particular relates to a laser processing method for cutting abrasive and brittle materials by using a Bessel beam. Background technique [0002] Common brittle materials include glass, sapphire, etc. Frosted and brittle materials are treated with ordinary flat materials by mechanical sandblasting, manual grinding (such as emery grinding) or chemical treatment (such as hydrofluoric acid dissolution) to make the surface rough and uneven. The surface roughness of common frosted materials is between 10-1000nm. [0003] Frosted material is very popular because of its frosted appearance and feel. With the continuous development of the mobile phone industry, the application of small pieces of frosted glass and sapphire is also rising. The frosted glass mobile phone back shell is more and more popular. of favor. However, due to the rough surface of the frosted material, the light produces ...

AI Technical Summary

Problems solved by technology

However, due to the rough surface of the frosted material, the light produces diffuse reflection, so the frosted material cannot be seen through, and the rough surface will destroy the integrity of the Bessel beam focusing system for laser cutting. The Bessel beam cannot be focused normally, making the conventional The Bessel beam system cannot cut; and for brittle materials with double-sided frosting, it will also cause failure to achieve normal focusing and cutting

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