Laser beam generation involves lasing material stimulation using lamps or electrical discharges in a closed container. As stimulation is performed on the lasing material, internal reflection of beam is experienced with help of a partial mirror, till sufficient energy is achieved to evade as monochromatic coherent light streams. Fiber optic or mirrors are basically useful here in directing the coherent light to get to a particular lens, hence focusing light at the zone of work.
Different methods of laser cutting exist depending on material cull. Vaporization cutting here, focused beam heats material surface to boiling point. A keyhole is generated as result, which increases absorptivity hence the hole deepening. While this hole deepens and material boils, generated vapor erodes molten walls. As a result, eject a is blown out hence further enlargement of the hole. This method can be used to cut non melting materials e. g. carbon and wood.
1.Melt and Blow
Utilizes high pressure gas in blowing molten material away from cutting area, hence greatly decreasing required power. After heating a material to melting point, a gas jet blows away this molten material off kerf hence need to increase material temperature further avoided. This process cuts metals.
Stress crackinglt involves focusing a beam on surface to localize the heating and ensure thermal expansion. It has glass cutting application due to sensitivity of brittle materials to thermal structure.
Uses laser beam as source of ignition. Application is in thick carbon steel cutting using less laser power. In conclusion, laser cutting brings about precision, simpler work holding and reduces workpiece contamination. The main disadvantage however is consuming high power.