Theory of an ultra-broad-band optical dielectric waveguide coupler system

A technique is described for operating a prism to dielectric thin-film waveguide system over a wide frequency band from a conventional broad-band source of the dye-laser type. The continuous coupling bandwidth can extend, typically, over a frequency range of twice to three times the center frequency. The experimental tolerances have been established and are shown to be within the capability of present-day technology.