Beam combining using rotated volume bragg gratings

Abstract

A beam combiner may include one or more light sources providing two or more input beams along two or more incidence paths and one or more rotated volume Bragg gratings (r-VBGs), where each of the r-VBGs is formed as planes of refractive index variation with periodicity along a respective grating vector at a respective non-zero angle relative to a respective one of the incidence paths of a respective one of the input beams, where the r-VBGs direct the two or more input beams along a common output path through at least one of transmission or reflection via Bragg reflection, and where at least one of the r-VBGs reflects a portion of at least one of the input beams satisfying a Bragg condition and having a polarization normal to a diffraction plane formed by a respective incidence path and the respective grating vector.

Dependencies are inferred from the claim text.