Interaction of waves under diffraction on coupling of two Bragg grating with close characteristics

The possibility of formation of the beam with edge dislocation, which is similar to the ТЕ 01(10) beam is considered. It is shown that such mode may be obtained due to the diffraction of plane wave on the complex Bragg hologram, constructed as composition of two grating recorded on the same place of registration media. These partial holograms are implemented as the gratings with constant period and close characteristics. The conditions of such operation are formulated. The experimental results are presented.