Abstract: An optical waveguide device adaptable to be coupled with one or more similar optical waveguide devices through commensurate slots on the devices, the slots guiding the ends of the respective waveguides into contact with each other, and into properly aligned optical coupling.

Abstract: An optical waveguide device adaptable to be coupled with one or more similar optical waveguide devices through commensurate slots on the devices, the slots guiding the ends of the respective waveguides into contact with each other, and into properly aligned optical coupling.

Abstract: A transparency for reproducing preselected area delineations in colors and intensities thereof variable at will is formed by using an interference pattern formed holographically by the interference of a split laser beam. The transparency has a plurality of mutually exclusive areas each individual area representing a variable color wherein the area or areas representing a particular variable color contains spatial frequency carriers which are oriented differently from the spatial frequency carriers of the other areas. The holographic process of preparing the transparency by separately exposing each area in a different orientation to the interference of the two said laser beams is also disclosed. The process and apparatus for utilizing the separation transparency to form predetermined images wherein the color of the individual areas and the intensity thereof forming such image may be varied at will is also disclosed.