摘要:
An optical frequency converter and method of making same is disclosed. The converter includes a nonlinear optical support having a homogeneous periodically domain reversed portion and an optical waveguide which traverses the surface of the support. At least a segment of the waveguide intersects the homogeneous periodically domain reversed portion of the support to achieve a quasi phase-matched nonlinear optical frequency conversion interaction. The domain reversed portion is selected to be compositionally indistinguishable from the remainder of the waveguide.
摘要:
A cubic perovskite crystal structure is disclosed satisfying the unit cell formula:R.sub.0.33+z A.sub.0.67 C.sub.1-y O.sub.3-xwhereR, A and C represent rare earth, alkaline earth and copper atoms, respectively, capable of forming a superconductive R.sub.1 A.sub.2 C.sub.3 orthorhombic perovskite crystal structure;x is 0.67 to 1.0;y is up to 0.2; andz is up to 0.1.The crystal structure can be used to form superconductive superlattices and weak links for Josephson junction devices. The crystal structure can be produced by laser ablation deposition at a temperature below that required for the formation of a superconductive R.sub.1 A.sub.2 C.sub.3 orthorhombic perovskite crystal structure. The crystal structure can be used as a substrate for the subsequent deposition of an R.sub.1 A.sub.2 C.sub.3 orthorhombic perovskite crystal structure.
摘要:
The invention generally is accomplished by a casting of a liquid metallo-organic ceramic precursor solution to form a layer on a substrate. This layer is then heated to a low temperature to create an amorphous layer. Then a selected area is heated to a high temperature by localized heating to create a patterned area of polycrystalline ceramic having electro-optic properties.
摘要:
Articles are disclosed in which an electrically conductive layer on a substrate exhibits a superconducting transistion temperature in excess of 90.degree. K. Conductive layers are disclosed comprised of a crystalline heavy pnictide mixed alkaline earth copper oxide. Processes of preparing these articles are disclosed in which a mixed oxide precursor composition is coated and heated to its thermal decomposition temperature to create an amorphous mixed metal oxide layer. The amorphous layer is then heated to its crystallization temperature.
摘要:
A patterned crystalline superconducting layer is formed by first providing a copper oxide lift-off layer under an amorphous metal oxide superconducing precursor layer and then photolithographically forming a pattern in the layers. The patterned layers are then heat treated to form the final crystalline superconducting layer.
摘要:
A metalorganic deposition method is disclosed for manufacturing a heavy pnictide superconducting oxide film on a substrate, in which a mixed metalorganic precursor is coated and heated to its thermal decomposition temperature to create an amorphous mixed metal oxide layer. The amorphous layer is then converted to a crystalline coating by further heating followed by cooling in the presence of oxygen.