4. Glossary
rayon de gorge: waist
Commonly used Anglicism meaning "neck" of the beam (characteristic of a Gaussian beam).
half width or radius
At a given z coordinate, the quantity defining the half-extent of the Gaussian ray for an intensity greater than or equal to e -2 = 13.5% of the maximum intensity.
half diffraction angle
Angle at the apex of a cone drawn by the Gaussian beam for a large z coordinate (characteristic of a Gaussian beam).
Rayleigh's length: longueur de Rayleigh
Dimension noted z r for which the half-width of the beam is equal to ...
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