TIA's Glossary of Telecommunication Terms
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gaussian beam
A beam of light whose electric field intensity distribution is gaussian. Note: When such a beam is circular in cross section the intensity at distance r from the center, E (r ), is given by 
where E (0) is the electrical field strength at the beam center, i.e. , at r = 0; and w is the value of r at which the intensity is 1/e of its value on the axis.