Waveguide Manufacturing for AR Displays, Past, Present and Future

Current AR waveguide fabrication processes, including Surface Relief Gratings (SRG), holographic and cascaded mirrors, are reviewed. We present DigiLens’s Switchable Bragg Grating (SBG) based process, a manufacturing method based on classical holographic contact copy, which today is used for both large and small AR displays including a range of displays suitable for HUD and XR applications.