Method and device for cutting transparent material by using ultra-short pulse laser
A technology of ultra-short pulse laser and transparent materials, which is applied in the direction of glass cutting devices, fine working devices, laser welding equipment, etc., can solve the problems of rough cutting surface and slow cutting speed, and achieve good cutting surface quality, deep cutting depth, small kerf effect
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Embodiment 1
[0053] Please refer to Figure 5 , the present embodiment adopts the picosecond laser ultrashort pulse laser generating device-picosecond laser 8 of high repetition rate, in the present embodiment, can adopt two kinds of different picosecond lasers, and a kind of is that the repetition frequency Fcon is 15 megahertz , a picosecond laser with a maximum average output power of 100W and a single pulse width of 12ps, the pulse is modulated by an external electro-optical switch, and the modulation frequency Frep is 1 Hz to 1 MHz. The modulation pulse width Wt can be controlled between 20 nanoseconds and 2 microseconds, so that each trigger signal can output 1-12 laser pulses. The other is the seed source output frequency Fseed and 50 MHz, with two high-frequency electro-optic switches inside and outside the laser cavity for modulation, the average output power Po is 50W, and the repetition frequency Frep is 400 kHz to 1 MHz. For a laser with a width of 8ps, each trigger signal pul...
Embodiment 2
[0059] The basic structure is similar to Embodiment 1, the difference is that in the laser transmission optical path, the laser is divided into two beams A and B through the beam splitter 14, the A beam accounts for between 15-40% of the laser output power, and the A and B beams respectively use The diopter-adjustable beam expander 15 expands the beam, and then adds a 1 / 2 wave plate 16 on the A beam path to deflect the laser polarization direction by 90 degrees, and then combines the A and B beams into one beam through the polarization beam splitter prism 18, and then uses 4. The wave plate 19 converts the laser linear polarization into circular polarization.
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