Ultrafast laser application in glass cutting
Glass materials have been widely used in mobile phones with many advantages such as changeable shapes, good impact resistance, and controllable costs, including mobile phone front covers, rear covers, camera covers, filters, fingerprint recognition films , Prism, etc.
Although glass materials have many advantages, their fragile characteristics bring many problems to the processing process, such as cracks and rough edges. In addition, the special-shaped cutting of the earpiece, front camera, fingerprint film and other positions also puts forward higher requirements on the processing technology.
Traditional glass cutting processes include knife wheel cutting and CNC grinding and cutting. However, it has the disadvantages of low glass yield, low material utilization, complicated post-processing after cutting, and slow speed.With the development of laser technology, ultrafast lasers (or ultrashort pulse lasers) have achieved rapid development, especially in the application of glass cutting.
Ultrafast laser processing principle
Ultrafast laser refers to a pulsed laser whose output laser pulse width is in the picosecond (10-12 seconds) level or less than the picosecond level, with extremely high peak power.
For transparent materials such as glass, when the ultra-high peak power laser is focused inside the transparent material, the nonlinear polarization inside the material caused by the propagation of light changes the propagation characteristics of the light, causing the beam to appear self-focusing (wavefront Focus). Due to the extremely high peak power of the ultrafast laser, the pulse is continuously focused in the glass and transmitted all the way down to the inside of the material without divergence until the laser energy is not enough to continue to support the self-focusing phenomenon. At this point, the place where the laser has been transmitted leaves a trace like a thread (only a few microns in diameter). Connect these threads and apply stress to them, and the glass will split along the threads on its own.（China Laser focusing Lens Factory）
And this processing method also ensures that the processing process will not affect the surrounding materials in the space involved, so as to achieve the "super fine" processing.
In addition, non-contact processing can also avoid problems such as chipping and cracking in traditional machining methods. It has high precision, no micro-cracks, broken or fragmented problems, high edge crack resistance, and no need to wash, polish, polish, etc. The advantages of secondary manufacturing cost, etc.while reducing the cost, greatly improving the yield and processing efficiency of the workpiece.
How to ensure the stability of filament formation when the laser is applied to the material?
It can be solved by beam shaping. （Laser focusing Lens supplier）Laser beam shaping uses beam shaping lenses, lenses, microlenses or optical fibers of different shapes to achieve a homogenization effect on the spot.
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