Abstract: A see-through near-eye display device guides virtual-image light in a one-dimensional waveguide composed of a multi-domain lithium niobate crystal containing a plurality of ferroelectric domains. Each ferroelectric domain is polarized along a z-axis of the lithium niobate crystal and has a polarization direction opposite the polarization direction of an adjacent ferroelectric domain. The high refractive index of lithium niobate enables displaying large-FOV virtual imagery. The multi-domain structure prevents undesirable charge buildup associated with the ferroelectric and pyroelectric properties of a single-domain lithium niobate waveguide.

Abstract: In accordance with the present invention, a crystal laser material that is suitable for self doubling is presented. A crystal according to the present invention includes a stoichiometric lithium niobate crystal isomorph host material doped with at least one laser ion. In some embodiments, the stoichiometric lithium niobate crystal isomorph host material is lithium niobate. In some embodiments, the stoichiometric lithium niobate crystal isomorph host material is lithium tantalate. In some embodiments, the at least one laser ion includes Ytterbium. In some embodiments, the at least one laser ion includes a rare-earth ion. In some embodiments, the stoichiometric lithium niobate crystal isomorph host material is periodically poled to provide quasi-phase matching. Additionally, further dopant ions, for example Magnesium, can be included.