Abstract
The paper describes a stable method for multiplexed recording of the Bragg diffraction gratings for waveguides using a phase mask. Diffraction waveguides in this experiment were made of photo-thermo-refractive glass. Two types of the phase mask are considered: surface and volume. Their comparison is based on diffraction characteristics of manufactured single and multiplexed Bragg gratings. The experimental results showed the advantage of surface phase mask application. To confirm the efficiency of the proposed method, diffraction waveguides was successfully fabricated and integrated in see-through near-eye display.
Highlights
With the development of augmented reality (AR) [1,2] and integrated photonics devices [3], researchers are faced with the task of developing new methods for waveguide holograms recording and creating the diffraction waveguides
Linear displacements significantly exceed the period of the recorded Bragg diffraction gratings during the recording described
In the course of the study, a comparison was made between two types of phase masks: the surface non-selective phase mask and the volume selective phase mask
Summary
With the development of augmented reality (AR) [1,2] and integrated photonics devices [3], researchers are faced with the task of developing new methods for waveguide holograms recording and creating the diffraction waveguides. The planar waveguides rely on photo-thermo-refractive (PTR) glass as a holographic volume media. This material is unique for the integration of a phase diffraction elements into the waveguide platform [6]. Presented research is distinguished by oblique illumination of the phase mask with a single recording laser beam to manufacture the slant volume gratings for AR waveguide displays. Conventional phase mask techniques provide recording of the structure with isophase fringes perpendicular to the substrate surface With such a limitation, it is impossible to create AR waveguides, since their functioning directly depends on the direction of the diffraction structure relative to the substrate surface. To confirm the efficiency of the proposed method, the diffraction waveguide was successfully fabricated and integrated in see-through AR display
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