In people's daily life, glass and glass products are everywhere. Glass is widely used in construction, 3C electronics, automobiles, solar cells and other fields. 

The remarkable feature of glass is its hardness and brittleness, which brings great challenges to processing. The traditional mechanical glass cutting technology, such as diamond grinding wheel cutting, sand blasting or water jet cutting, is not accurate, the edge is lack of regularity, and there is a large and asymmetric residual edge stress in the cutting process; the precision and efficiency of special-shaped cutting are low. If there is an edge requirement, the grinding process needs to be added, which is time-consuming and laborious. In addition, when the single piece of glass is thinned to the micron level, the traditional mechanical cutting method will no longer be applicable. The unique advantages of ultrafast lasers make it possible to process these glass materials.

When the pulse width reaches the order of picoseconds, the shorter the pulse, the faster the energy is transferred to the electrons, and there is not enough time for temperature equilibrium between the electrons and the lattice. When the laser output pulse of about 10 PS acts on the glass surface, the instantaneous high energy density deposition makes the electron absorption and movement mode change, the heat of the electron begins to diffuse to the surrounding lattice, leading to phase explosion, thus completing the removal and cutting of the glass surface material from point to line, the whole process avoids the laser linear absorption, energy transfer and diffusion. Therefore, there is almost no thermal effect. The processing method of this kind of picosecond laser is also called cold processing. The overall cutting edge texture is better, the edge collapse is small, the cracks are few, and the processing efficiency is high.

Bessel beam is also called "non-diffracting beam". Its transverse light field distribution does not change with the propagation of the beam. The diameter of the focal spot can be as small as several microns, but the focal depth can be as deep as several millimeters. It is the first choice for cutting transparent brittle materials. By utilizing the characteristic of the Bessel beam, the Bessel ultrafast laser beam is used for cutting the glass, and the glass at the section of the laser can be modified only by slightly applying external force or thermal stress, so that higher cutting and separating quality is obtained. 

Using the characteristics of picosecond ultra-fast laser and Bessel beam, Baiyi Laser Team independently developed laser glass cutting equipment to achieve high-speed and high-quality glass cutting. The equipment is equipped with a Bessel cutting head with a focal depth of 2-10 mm to meet the requirements of the market for glass with different thicknesses and different application processes; it is equipped with a Brust pulse train mode laser to improve the longitudinal processing capacity; The machine is equipped with PSO (position synchronous output) function, which is synchronized with the synchronous output signal of the laser (or dispensing injection valve and other equipment) for phase synchronization. The output switch is triggered at a constant space (or constant time) interval in all stages of the motion trajectory (including acceleration, deceleration and uniform speed), so that the pulse energy uniformly acts on the object to be processed.

The laser glass cutting equipment can meet the special-shaped cutting of various glass materials, and the broken edge is less than 5 μm, and the edge is smooth and tidy. In addition, by improving the optical path, our team shaped the beam into a Bessel-like beam, which effectively improved the speed of cutting and the effect of subsequent splitting. When the laser output power is 40 W, the cutting speed of 1 ~ 4 mm glass can reach 350 mm/s, and the splitting speed is 180 mm/s.