Glass cutting method by laser self-focusing and wire feeding

Abstract

A glass cutting method by laser self-focusing and wire feeding comprises the following steps of: focusing laser beams into the inside of glass to promote internal refractive index of the glass to change, using distortion generated by laser wave front to generate laser self-focusing, using laser energy near focus formed by the laser self-focusing to generate multiphoton absorption ionization puncture damage inside the glass so as to form long wire damage crack, moving the laser beam along the cutting path so as to expand the long wire damage crack into a fine band-shaped damage crack, changing the height of the focus formed by the laser self-focusing inside the glass, repeatedly moving the laser beam along the cutting path so as to make the fine band-shaped damage crack penetrate the whole glass substrate, and finally using thermal stress, mechanical force or chemical method to form stress on the glass surface so as to break the glass along the fine band-shaped damage crack. The glass cutting method has advantages of high cutting precision, fast speed, low cost and high notch quality. By the adoption of the method, no subsequent polishing and grinding treatment is required, sharp edge will not be formed, and glass with any thickness and shapes can be cut.

Description

Technical field: [0001] The present invention relates to the field of physics, in particular to optical technology, in particular to laser cutting processing technology, in particular to a laser self-focusing threaded glass cutting method. Background technique [0002] Glass is used in a wide variety of applications, from electronic glass substrates used in flat panel displays and the electronics industry, to large-scale glass sheets used in large-scale manufacturing such as the automotive industry or construction. The most common type of glass is soda-lime glass, which is mainly used in the automotive industry, construction industry and household appliances, with a general thickness of 1.6-12mm. Glass with a thickness of less than 1mm is called borosilicate glass, which is mainly used in the fields of flat panel displays (FPD) and electronic products. With the application of more new products, the quality requirements for glass products are getting higher and higher. In ad...

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Problems solved by technology

[0007] The object of the present invention is to provide a laser self-focusing wire-threaded glass cutting method. The laser self-focused wire-threaded glass cutting method should solve the problem of thermal stress affecting the processing quality, low cutting efficiency, and low cutting efficiency in the existing laser cutting glass technology. Technical Problems of Cutting Glass Thickness Limited

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