2. Laser beam properties
Although made up of ordinary photons, the laser beam possesses properties that are inaccessible to traditional light sources.
2.1 Directivity
The cavity is narrow and elongated, and only photons propagating exactly along the cavity axis benefit from amplification greater than losses: the laser beam is therefore totally directional. In fact, its divergence is very often close to the limit imposed by diffraction.
A laser beam can :
propagate over long distances while remaining collimated;
be focused at a point whose dimensions are limited by diffraction.
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Laser beam properties
Different types of laser
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