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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
Bibliography
- (1) - Les Lasers et Leurs Applications Scientifiques et Médicales - Édition C. Fabre et J. P. Pocholle, Les Éditions de Physique (Paris) (1996). 1.1 C. FABRE, Les Lasers – Principes Fondamentaux, pp. 1-40. 1.2 G. BOULON, Matériaux pour Lasers à Solide, pp. 259-286. 1.3. H. MONERIE, Fibres optiques dopées et applications, - pp. 357-382....
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