Abstract:
A method is disclosed of manufacturing an optical stripline waveguide for use in non-reciprocal optical components, in which a monocrystalline waveguide strip having a refractive index n.sub.2, which is surrounded by material with a lower refractive index n.sub.1, is provided on a monocrystalline substrate, the waveguide strip and the material surrounding it being deposited on a substrate by means of RF cathode sputtering (sputter epitaxy) in an inert gas plasma, making use of a target which contains mainly iron garnet phase, together with other phases with an almost equal sputtering rate, the crystal lattice of said substrate being locally disturbed in the surface regions where no waveguide strip is to be grown, thereby forming a lattice disorder.
Abstract:
This invention discloses an optical circulator compatible with optical glass fiber transmission lines in optical communications in the wave length range of 1.0.about.1.7 microns. An optical circulator embodiment of the invention utilizes a magneto-optic circulator cylinder with the entry and reflective ends, at least three coupling glass-fiber transmission lines being connected to the entry end. The biasing magnetic field is applied in parallel with the common axis. This circulator embodiment of the invention possesses advantages in consisting of minimal constituents, and in being easy to make and simple to adjust.
Abstract:
The device according to the invention comprises a wave guide formed by a thin layer of a ferrimagnetic garnet deposited onto a substrate, preferably by epitaxy, and capable of propagating first and second modes of radiated energy, means for exciting the first mode in said layer, means for inducing a magnetic field in the propagation direction to enable at least a fraction of the propagated energy to be transferred from the first mode towards the second mode, means for selectively transmitting one of the two modes situated in front of the guide, for example a metallic layer deposited onto the thin layer and means for extracting the energy of the transmitted mode.
Abstract:
A tunable permanently fixed diffraction grating is interposed in the path of an optical beam propagated in an integrated-optics device. Tuning is accomplished, for example, by establishing a variable electric field in the propagating medium to control its refractive index. In that way the effective grating spacing is changed. As a result tunable optical filters and intensity modulators are thereby realized.
Abstract:
A device for converting the propagation mode of radiated energy, ulitizing the Cotton-Mouton effect. It is constituted by a substrate upon which there is deposited an epitaxially produced film of yttrium-iron garnet, magnetized in a direction having at least one component normal to the direction of energy propagation, and with a thickness such that the propagation velocities of the two modes, initial and final, are identical to one another.
Abstract:
An optical waveguide which provides coupling between waveguide modes dependent upon the direction of propagation. The device comprises a sandwich of an anisotropic material, a neutral material and a magneto-optic material. Such a system may be used as an isolator or circulator in integrated optical circuits.
Abstract:
Thin-film optical waveguides are disclosed comprising singlecrystal rare-earth garnet films deposited on garnet substrates. Epitaxial film growth techniques, developed largely for magnetic bubble domain devices, provide films with superior optical properties either at visible or near-visible wavelengths. The thin-film optical waveguides are comprised of transparent garnet films of the general formula R3B5O12; where R can be yttrium, lanthanum, bismuth, or a rare-earth ion with an atomic number of 60 to 71 inclusive, and B an be either magnetic, i.e., iron, or nommagnetic, i.e., gallium or aluminum. The use of the former types of films can give rise to various thin-film magnetic devices suitable for integrated optical circuit arrangements. One such device which is disclosed, a thin-film magneto-optical switch and modulator, includes a light-guiding film of an iron garnet composition and a serpentine micro-circuit which is deposited on the film to carry a switching current. The device provides a continuous switching of the polarization modes of the light waves guided in the film. Similarly, by applying a microwave current to the same circuit, the guided light can be modulated.
Abstract:
A novel Faraday-effect element having a refractive index highest along the axis and decreasing toward the surface is produced by immersing a thin elongated glass body containing an oxide selected from the group consisting of paramagnetic- and diamagnetic-type oxides composed of at least first cations, in a bath of salt including second cations having a smaller ration of the electronic polarizability to the third power of the ion radius than said first cations. The bath is maintained at a temperature to permit said second cations to diffuse into said glass body so that said first cations may be substituted by said second cations.
Abstract:
An optical isolator 10 according to the present disclosure includes a substrate 11 and an optical waveguide 12 provided on the substrate 11. The optical waveguide 12 includes a first end part 13, a plurality of second end parts 14 arranged in an array, and at least one branching part 18 located between the first end part 13 and the plurality of second end parts 14. The optical waveguide 12 has a portion having non-reciprocity and gives different non-reciprocal phase shift amounts between the first end part 13 and at least two of the second end parts 14.
Abstract:
A coordinate measuring device is provided having a light source that emits a beam of light. A distance meter measures a distance to a target. A first locator camera assembly includes a first camera and first lights. A second locator camera assembly includes a second camera and second lights. The processor matches retroreflectors in a first image of the first camera and a second image of the second camera based on a shape-and-context matching of retroreflector spots in the first and second image and on an area-context-matching of background objects in the first and second image. The retroreflector spots in the first image produced by illumination of the retroreflectors by the first lights, the retroreflector spots in the second image produced by illumination of the retroreflectors by the second lights. The processor provides a third image that includes both the background objects and markers indicating the matched retroreflectors.