MEASUREMENT OF THE DIAMETER OF A GAUSSIAN -BEAM

We describe an experimental setup to measure the diameter of gaussian beam with a bandwidth L, centered onto slit of width l. The method pro posed by Mata-Mendez demands the measurement of two experimental value s: the transmission coefficient tau and the diffracted intensity I(the ta) from which we may able to determine the diameter of the incoming g aussian beam. In the case of a He-Ne laser, the numerical conditions a re 0.001 less than or equal to lambda/l less than or equal to 0.1 and L/l greater than or equal to 1.5.