How the material is processed by laser
The laser has high brightness, high energy and extremely high directivity. A beam expander, a mirror, a focusing mirror, and the like are arranged between the light source and the workpiece, and finally the processing head. The laser is focused by this optical path system into a very small, extremely high energy density point where it reacts with the material and processes it.
Continuous light: There is no interval, continuous light waves, and the maximum power is always obtained under ideal conditions.Pulsed light: There are spaced light waves that have a higher peak power at the same average powe.
Q: What is the pulse width?
A: The pulse width is the length of the pulse duration.
Q: What are the processing characteristics of short pulses?
A: The pulse light with a long duration is like a blunt knife. The pulse light with a short duration is like a sharp knife. The shorter the pulse, the higher the peak power, the shorter the contact material time, the greater the force, the better the processing effect, the smaller the heat effect and the higher the precision, which is what we often say.
Q: How do short pulses achieve cold working?
A: The ultra-short pulse width causes the peak power of the laser pulse to be very high, which can break the intermolecular bond, which is equivalent to evaporating the material. Rather than a continuous laser or a long-pulse laser, when the material is processed, it absorbs the light radiation to generate thermal energy, and then propagates to the adjacent molecules, and the molten material reaches the processing effect. Therefore, short pulse processing achieves cold processing in a relative sense.