Volume holographic grating structure determination method, diffraction optical waveguide and near-to-eye display equipment

The embodiment of the invention discloses a volume holographic grating structure determination method, a diffraction optical waveguide and a near-to-eye display device. The determination method comprises: establishing a coordinate system according to a photosensitive material; selecting a first point in the photosensitive material, and determining coordinates of a first intersection point and a second intersection point according to the coordinates of the first point and a refraction law; determining a first optical path difference between the first intersection point and the second intersection point and a second optical path difference in the photosensitive material according to the coordinates of the first point, the first intersection point and the second intersection point; determining the phase difference of the two beams of light at the first point according to the first optical path difference and the second optical path difference; determining a refractive index at the first point according to the ph