Ethereal provides diffractive waveguide lenses (Surface Relief Grating, “SRG”) for AR glasses development. By combining advanced waveguide design with different grating structures (slanted, blaze, binary) and high-refractive materials (n=1.8, 1.9, 2.0) and substrates (n=1.8, 1.9, 2.0), we achieve the best optical performance, and can provide high-efficiency SRG technology solutions for our customers.