A new organic material for polarization holographic recording--azo-dye methyl-orange, introduced in polyvinyl alcohol (PVA)--is fabricated and investigated. It possesses all the good characteristics of the known polarization-sensitive materials--high sensitivity, reversibility, etc.--but excels them substantially in the magnitude of the photoinduced birefringence: delta n > 10(-3). This makes possible the recording of reversible polarization gratings with diffraction efficiency over 30%. Depending on the conditions of production and subsequent mechanical and thermal treatments the layers of methyl orange/PVA may also have intrinsic birefringence. In this paper the results of experimental investigations into the properties of this new material are reported.

Polarization holography. 1: A new high-efficiency organic material with reversible photoinduced birefringence.

A wearable wireless audio device includes a support, an electronics circuit, and a speaker. The support includes a first ear stem and an orbital, and is configured to support at least one lens in a wearer's field of view. The electronics circuit is supported by the support and is configured to receive at least one digital audio file and generate an audio signal indicative of the at least one digital audio file. The speaker is supported by the support, and is directed toward at least one of the wearer's ears. The speaker is configured to convert the audio signal into sound. The speaker has a speaker face, and the speaker is configured to rotate from a first position in which the speaker face is substantially parallel to a yz-plane to a second position in which the speaker is inclined at an angle with respect to the yz-plane. The speaker is coupled to the support with a speaker pivot, and is configured to rotate about the speaker pivot while maintaining the speaker face substantially parallel to a yz-plane. The speaker is configured to move along an axis substantially parallel to a z-axis with respect to the support.

Wireless interactive headset

Semiconductor-on-insulator (SOI) structures, including large area SOI structures, are provided which have one or more regions composed of a layer (15) of a substantially single-crystal semiconductor (e.g., doped silicon) attached to a support substrate (20) composed of an oxide glass or an oxide glass-ceramic. The oxide glass or oxide glass-ceramic is preferably transparent and preferably has a strain point of less than 1000°C, a resistivity at 250°C that is less than or equal to 1016 -cm, and contains positive ions (e.g., alkali or alkaline-earth ions) which can move within the glass or glass-ceramic in response to an electric field at elevated temperatures (e.g., 300 - 1000°C). The bond strength between the semiconductor layer (15) and the support substrate (20) is preferably at least 8 joules/meter2. The semiconductor layer (15) can include a hybrid region (16) in which the semiconductor material has reacted with oxygen ions originating from the glass or glass-ceramic. The support substrate (20) preferably includes a depletion region (23) which has a reduced concentration of the mobile positive ions.

Glass-based soi structures

A laminate, electro-optic rearview mirror assembly is disclosed which is protected against scattering fragments while reducing risk of laceration if broken/damaged, against ultraviolet (UV) radiation degradation, and against fogging or misting in high humidity conditions

Anti-scatter, ultraviolet protected, anti-misting, electro-optical assemblies

An electro-optic rearview mirror assembly is disclosed which is protected against scattering fragments while reducing risk of laceration if broken/damaged, against ultraviolet (UV) radiation degradation, and against fogging or misting in high humidity conditions. The mirror may include a first element incorporating specialized yellow/orange/red visible light absorbing, UV radiation reducing glass having a blue or green color to provide a consumer acceptable silvery reflection even when yellow tinted UV radiation absorbing additives are mixed in the electro-optic medium of the assembly. The first element may be laminated from a pair of optically transparent, tinted, tempered safety, or other glass panels and incorporate UV radiation reducing paint/lacquer coatings or polymeric films. The panels may be secured together with UV radiation reducing Saflex™ PVB sheeting, or other UV radiation reducing polymeric interlayers including blue or blue/green tinted, yellow/orange/red visible light absorbing sheeting or UV curable, pourable adhesive. Yellow/orange/red light absorbing dye may be incorporated in the electro-optic medium or the curable adhesive.

Anti-scatter ultraviolet protected, anti-misting, electro-optical rearview mirror

Glasses are disclosed which are used to produce substrates in flat panel display devices. The glasses exhibit a density less than about 2.45 gm/cm 3 and a liquidus viscosity greater than about 200,000 poises, the glass consisting essentially of the following composition, expressed in terms of mol percent on an oxide basis: 65-75 SiO 2 , 7-13 Al 2 O 3 , 5-15 B 2 O 3 , 0-3 MgO, 5-15 CaO, 0-5 SrO, and essentially free of BaO. The glasses also exhibit a strain point exceeding 650° C.

Glasses for flat panel displays

Surface-colored photochromic glass articles produced by reduction heat treatments at 450° C. and below which exhibit induced absorption peaks at longer wavelengths than prior art glasses, and surface colors such as orange, red, purple and blue, are described.

Colored photochromic glasses and method

The absorptive and refractive properties of additively colored glasses containing an absorptive metallic silver phase and a separated silver halide phase are altered by irradiating the colored glasses with visible light. Polarization effects and multicolored images can be produced.

Colored, dichroic, birefringent glass articles produced by optical alteration of additively-colored glasses containing silver and silver halides

There is disclosed a method of producing a photochromic glass having a reduced transmittance for ultraviolet radiation while having substantially unimpaired photochromic properties. The method comprises providing a combination of 0.1-1.0% CeO2 and 0.1-1.5% Sb2 O3 and/or As2 O3 as part of the glass composition. In an embodiment utilizing minimal silver content, the glass article in thicknesses of 1.3 to 2.0 mm. can be chemically strengthened to surpass the impact specification imposed by the Federal Food and Drug Administration for eyewear, will transmit less than 0.2% of radiation having wavelengths between 290-315 nm, and will demonstrate a darkened luminous transmittance at 20°-25° C. below 35% and a fading rate such that after five minutes the luminous transmittance will be at least 1.75 times that of the darkened transmittance. These glasses consist essentially of: ______________________________________ SiO2 55-61 Ag >0.1-<0.2B2 O3 18-21 Cl 0.2-0.6Al2 O3 5-11 Br 0.05-0.2Li2 O 1.5-3 CuO 0.003-0.015Na2 O 2-5 CeO2 0.1-1.0K2 O 4.5-8 Sb2 O3 0.1-1.5______________________________________

Ultraviolet absorbing photochromic glass of low silver content

Optical anisotropy and color adaptation are induced in certain silver‐halide photochromic glasses by optical bleaching with polarized visible light. These induced optical effects have been found to be reversible and present after thermal fading. An explanation of the induced effects is given in terms of preferential optical bleaching of anisotropically shaped silver specks on the halide microcrystal. A simple model is presented which predicts the correct order of magnitude of the induced dichroic effect.

George Bigelow Hares

Papers

Glasses for flat panel displays

Colored photochromic glasses and method

Colored, dichroic, birefringent glass articles produced by optical alteration of additively-colored glasses containing silver and silver halides

Ultraviolet absorbing photochromic glass of low silver content

Optically induced anisotropy in photochromic glasses