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glossary

Laser: acronym of : « light amplification by stimulated emission of radiation » ; device emitting spatially and temporally coherent light radiation based on the stimulated emission
Gaussian beam: beam with a gaussian distribution of intensity in the plane perpendicular to the direction of propagation - fundamental transverse mode of a laser
Intensity ( physical optics ): local parameter proportional to the average energy or power of a light wave per unit area
Relative intensity: normalized intensity as determined by the ratio between the intensity and its maximum value