OPTICAL ASSEMBLY AND METHOD FOR REDUCING ZERO-ORDER LIGHT IN A HOLOGRAPHIC DISPLAY

摘要

An optical assembly 1 is provided for use in holographic display of a replay image. The optical assembly may be of particular use is an augmented reality headset. The optical assembly includes a light-modulation element 12 arranged to be illuminated off-axis by a light beam. The light-modulation element 12 modulates the incident light to generate a replay image and generates a zero-order light beam. A focusing system 19 is arranged after the light-modulation element. A light remover 120 is positioned after the focussing system and is configured to remove the zero-order light beam from the light focussed by the focussing system 19. The focussing system 19 is configured to focus zero-order light from the light-modulation element 12 in a first plane different from a second plane which is the plane of focus of parallel light of the replay image. The light remover removes the zero-order light in the first plane.