Laser, what´s that?
Laser stands for Light Amplification by Stimulated Emissionof Radiation, and is a physical effect with which artificially straightened light beams can be produced. The word Laser is not only used for the amplification effect but also for the light source.
Laser beams have charactristics which strongly differ from the classical light sources such as light bulbs.These include
- a very narrow frequency spectrum, which means that the light has only one colour, i.e. monochrome
- the parallelism of the beam which does not allow the beam to widen, even over long distances
- a long coherence length.
Due to these characteristics there are many possibilities of application in the industrial and research fields. They range from a simple indicator (e.g a laser pointer for presentations) via distance measuring equipment to cutting and welding tools such as the laser scalpel.
The laser beam serves, for example, as a source of heat for working different materials.
The YAG laser is most suitable for working metals, plastics and glass. Their wavelength of 1064 nm absorbs the light well and transfers this into heat. The laser beam leaving the so-called working-optics is guided to the workpiece via a microscope. The micrscope can vary the focal point and the working distance.
The accurate control of the laser energy and effect on the individual materials allows even the welding of different metals. The working parameters such as pulse energy, pulse duration, pulse frequence and focus diameter are adjusted directly on the controls of the laser equipment.
When carrying out repair work with the laser, only the pulsed laser is used. The counterpart of the pulsed laser is the continuous wave laser.
Laser Working Systems:
A laser working system consists of the following main components:
- Laser beam source
- Control system / Power unit
- Beam deflection
- Focussing optics
- Laser safety housing eventually fitted with additional mechanical axes.