100‐1: <i>Late‐News Paper:</i> Perturbation‐Damped Optical Interferometer for AR Waveguide Grating Fabrication

A perturbation‐resistant interferometer is designed and demonstrated for stable fabrication of sub‐micron pitch AR waveguide gratings. Polarization multiplexing allows every component in the interferometer to be shared by two beams which interfere at a high angle. Polarization volume hologram gratings featuring a grating pitch less than 300 nm are fabricated with this approach. The perturbation‐resistant short‐pitch grating fabrication method offers a reliable and scalable approach to mass‐producing holographic gratings with a sub‐micron grating pitch.