WAVE-GUIDE HOLOGRAM FOR OUTCOUPLING AND SIMULTANEOUS FOCUSING INTO MULTIPLE ARBITRARY POSITIONS

Outcoupling waveguide holograms are gratings with locally dislocated g rating lines etched into the waveguide surface. They couple light out of the waveguide into air and simultaneously provide focusing capabili ties. Here, we present a waveguide hologram that focuses light into sp ots in any desired three-dimensional configuration, The hologram is fa bricated on an InGaAsP-InP waveguide for 1550-nm optical wavelength. I n an experiment, we obtained simultaneously focused spot patterns at 1 .5, 3 and 40 mm distance from the waveguide surface. The uniformity er ror was 23%, 8%, and 16%, respectively, for the three patterns and the diffraction efficiency was 40%.