Autocollimation mode at diffraction of three-dimensional Gaussian beam on two-dimensional-periodic reflect array

The carried out analysis gives full representation about the basic energy properties of fields of the Gaussian wave beams scattered by a reflect array in a mode of an autocollimation. The described phenomena of not specular reflected wave beam by two-dimensional-periodic structure can be interested for wide range of practical applications. At numerical research of properties of a reflect array of the short-circuited rectangular wave guides, the possibility of quasi complete autocollimation transformation of Gaussian wave beam is shown. The presented results give the chance to spot, at what parameters of an incident beam and an array it is possible to gain effect of the complete autocollimation. In the given work the energy performances and three-dimensional patterns in far-zone for not specular wave beam for the first time are gained. The presented results cannot be interpreted as extremely achievable as investigations were spent in limited range of parameters changes of an incident beam and a reflect array.