1. Laser principles
The laser is an optical oscillator, and every laser therefore consists of the three basic elements of an oscillator:
an amplifying medium supplied with energy by an external source ;
a positive feedback, allowing the amplified energy to be reinjected into the amplifying medium;
and a coupling of the energy generated in the amplifying medium to the outside.
1.1 Amplifying medium
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Absorption
An ordinary material, even a transparent one, always absorbs light to a greater or lesser extent. The atoms or molecules making up the material absorb the incident...
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Laser principles
Laser beam properties
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