Bylaser is an expert provider of laser cutting services. As such, the company boasts extensive knowledge in laser cutting technology. The following are some important characteristics of laser worth considering when opting for this technology:
Lasers present a number of properties which distinguish them from all other sources of electromagnetic radiation existing in nature:
The light beam is composed of a ray of electromagnetic waves of a single frequency. Theoretically, this concept can be easily understood, in practice, it cannot be achieved, because the beam is made up of various wavelengths, even though they are very close to each other, and for this reason they are situated in an extremely restricted band of the spectrum. However, it is legitimate to speak of monochromaticity especially with respect to radiation obtainable with any other conventional light source including monochromatic lights (spectral lights).
This is the parameter that most profoundly distinguishes the optical qualities of a laser and explains its applications. By brightness, we mean the power (in Watts or Joules per second) emitted per unit of surface area and per unit of solid angle. The enormous brightness of the laser beam allows it to reach a great energy density, such as can sublimate or melt the hardest of metals or heat-resistant materials. We recall that the ratio of focalized laser brightness to the brightness of the sun at its Zenith is approximately 60,000.
Coherence is the property directly related to stimulated emission, by which the individual emissions occur in phase with each other. We distinguish spatial and temporal coherence:
Spatial coherence because the wave fronts maintain a constant form;
Temporal coherence because the phase difference of the wave remains constant whatever the time under consideration, a concept linked directly to having a sole frequency or spectral line, and, therefore, to monochromaticity.
- Unidirectionality of radiation is intimately related to spatial coherence, and results from the structure of the laser resonance cavity which, consisting of parallel mirrors, allows only those beams which are exactly perpendicular to the surface of the mirror to propagate and escape. This also explains why the laser light beam has a very limited angular divergence.