Diffraction optical waveguide and AR glasses

The invention relates to a diffraction optical waveguide and AR glasses. The diffraction optical waveguide comprises an optical waveguide substrate, and a coupling-in region, a relay region and a coupling-out region which are arranged on the optical waveguide substrate, each relay area is arranged between the coupling-in area and the coupling-out area; the coupling-in grating is arranged in the coupling-in area and used for coupling light into the optical waveguide substrate and transmitting the light to the relay area and the coupling-out area; the relay grating is arranged in the relay area and used for changing the transmission path of the light so that the light can spread all over the coupling-out area; and the coupling-out grating is arranged in the coupling-out area and is used for coupling out the light from the coupling-out area. According to the invention, the relay grating can change the transmission path of a part of light, so that the light coupled from the coupling-in grating can be transmitted to the coupling-out area through the relay grating and covers the whole coupling-out area, the problem that the coupling-out area has a field-of-view dark corner is avoided, and the energy utilization efficiency of the light is improved at the same time.