Article | REF: AF3275 V2

Fundamental Physics of Solid-State Laser-Type Materials

Author: Georges BOULON

Publication date: July 10, 2016

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6. Resonant cavity and laser beam intensity

As the length of the single-crystal rods cannot exceed several centimetres, the amplification provided by a single pass is too small to be noticeable. The beam amplified during a first pass must therefore be re-injected by means of mirrors forming an optical resonant cavity or resonator. After multiple passes, the intensity of the emerging beam increases significantly. This is why the Fabry-Pérot cavity is so useful for interferometric studies. There are, however, single-pass amplifying media needed to amplify once the emission of a pump laser (ruby, YAG) or the laser emission from the oscillating cavity of a dye laser. They are sometimes referred to as superradiant media.

6.1 Gaussian beam optics

The successive back-and-forth movements are produced by two...

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Resonant cavity and laser beam intensity