What is a Bragg Polarization Grating?
A Bragg Polarization Grating (BPG) is a special case of a polarization grating that operates in the Bragg regime or Q>1. It has several unique properties that make it ideal for several applications including augmented and virtual reality.
How It Works
A Bragg polarization grating (BPG) is an optically “thick” grating. BPGs are analogous to Volume Phase Holograms and Volume Bragg Gratings. When operating in the Bragg regime, a polarization grating will diffract only a single polarization (+1st order) and leave the orthogonal polarization un-diffracted. With a circularly polarized input, the efficiency can reach up to 99%. For very wide fields of view, the efficiency can be as high as 90%.
|Traditional Grating||ImagineOptix BPG|
|Field of View||20 Degree||60 Degree|