Skip to content Laser cutting uses a focused laser beam to separate material along a programmed path. The beam supplies concentrated energy to a narrow region while heat, vaporised material and molten debris are removed from the cut zone by the process itself and often by air or another assist gas.
What actually removes the material?
The mechanism depends on the material and laser process. Material may melt, vaporise, decompose or burn. Assist air or gas can help clear debris and control the reaction at the cut front.
What determines whether a laser can cut a material?
Important factors include laser wavelength, available optical power, beam quality, focused spot size, material thickness, absorption, travel speed and assist-gas conditions.
Why does focus matter?
The lens concentrates the beam into a narrow region of high power density. If focus is badly positioned, the kerf can widen, penetration can fall and edge quality can deteriorate.
Is more power always better?
No. More available power can increase speed or cutting margin, but poor focus, bad air assist, dirty optics or unsuitable material can still produce a poor result. Power and speed must be treated as part of the whole process.
For practical cutting science and setup, see LaserUser’s cutting investigations, material guides, air-assist guide and laser-power guide.
Related: What Is Kerf in Laser Cutting?, What Is Laser Focus?, Laser Air Assist and Laser Cutting Science and Basic Rules.
