North American Philips Corporation

Optical Semiconductors, Inc.

North America Phiips Corporation

Brian J Fitzpatrick

Phyllis M Harnack

Rameshwar N Bhargava

Scott H Baker

Pedro Tasaico

Alfred E Milch

Thomas F McGee, Iii

A material for use in a laser heterostructure which is lattice matched material to ZnSe and has a high band gap. The material is Mg.sub.y Zn.sub.1-y S.sub.x Se.sub.1-x with the ratio of sulphur to magnesium of 0.28/0.19. Lasing devices constructed from layers of this material and ZnSe can be either electron beam pumped or electrically driven.

Materials for II-VI lasers

A monolithic solid scintillation body with a monocrystalline or polycrystalline morphology having generally constant luminescence from about 25.degree. C. to at least about 200.degree. C. and average crystal domain grain diameters of at least about 5 millimeters and being composed of zinc sulfide doped with copper and a method of measuring radiation using the scintillation body and an apparatus for measuring radiation are disclosed.

Scintillation solid and method of measuring radiation

A method and apparatus for measuring radiation are disclosed in which a scintillation body intercepts incident radiation to cause the body to emit a population of scintillation photons, the population of scintillation photons is spectrally decomposed into at least a first subpopulation of photons and a second subpopulation of photons (the first subpopulation originating from faster time decay processes than the second subpopulation) and at least one of the subpopulations is detected.

Method and apparatus for measuring incident radiation

A material for use in a laser heterostructure which is lattice matched material to ZnSe and has a high band gap. The material is Mg.sub.y Zn.sub.1-y S.sub.x Se.sub.1-x with the ratio of sulphur to magnesium of 0.26/0.19. Lasing devices constructed from layers of this material and ZnSe can be either electron beam pumped or electrically driven.

A cathode-ray tube device for generating a bright light spot is provided, in the path of radiation, a container with a coolant from the cathode-ray tube containing a solution of about 0.5-2.0% by weight of a surfactant selected from the group consisting of sorbitan esters of fatty acids of 12-18 carbons, polyoxyethylene derivatives thereof and ethers of polyoxyethylene in polyethylene glycol 200-300 all of said container in contact with said solution being formed of polymethyl methacrylate and all surfaces of which container are in contact with said solution are provided with a thin layer of silicon dioxide.

Cathode ray tube device with improved coolant

A method for producing an optical waveguide which comprises imersing a wafer of K.sub.1-x Rb.sub.x TiOMO.sub.4, wherein 0.ltoreq.x.ltoreq.1, and M is P or As, for 1-64 hours in molten potassium nitride at 400.degree.-500.degree. C., followed by washing and immersing in a molten salt of Rb, Cs, or Tl at 240.degree.-335.degree. C., thereby causing the Rb, Cs, or Tl to replace the K or Rb cations. The resultant product has reduced mechanical damage to the waveguide surface.

Method of reducing surface damage in KTP optical waveguides

A method for selectively applying light-absorbing particles to a lenticular, light-transmissive screen, such as a projection television screen. The particles are charged and are selectively deposited in grooves between lenticules of the screen by electrically charging the lenticule peaks to the same polarity, to effect repulsion, and then depositing the particles onto the screen. The particles consist essentially of a material having a substantially higher microwave absorption coefficient than the screen material and have heat-fusible outer surfaces. After deposition, the particles are selectively heated by generally-applied microwave radiation, until they fuse to each other and to the screen.

Application of electrically-charged light-absorbing particles to a

Light-absorbing particles are selectively applied to a lenticular light-transmissive screen, such as a projection television screen. The particles are selectively deposited in grooves between lenticules of the screen by filling the grooves to a predetermined depth with a slurry comprising a mixture of a volatile liquid and the light-absorbing particles. Microwave radiation is applied to the screen with the deposited particles, to effect evaporation of any unevaporated liquid and fusing of the particles to each other and to the screen.

Selective application of light-absorbing particles to a lenticular screen

A method for selectively applying particles having cores of magnetically-permeable material and outer, fusible surfaces to a lenticular, light-transmissive screen, such as a projection television screen. The particles are selectively deposited in grooves between lenticules of the screen by magnetically attracting the particles to tips of a particle carrier sheet which positionally correspond with the grooves in the screen. The screen is then positioned underneath the carrier sheet, and the magnetic attractive force is reduced to effect release of the particles into the grooves of the screen. Microwave radiation is applied to the screen with the deposited particles, and the magnetically-permeable cores concentrate microwave energy dissipation in the particles and effect selective heating of the particles until their outer surfaces fuse to each other and to the screen.

Magnetic application of light-absorbing particles to a lenticular screen

Undesired light radiations emitted by europium activated red luminescent phosphors employed in projection color televisions are greatly reduced, with essentially no reduction in the desired radiation, by employing as a filter a solution containing a soluble holmium salt and a soluble neodymium salt.

Red luminescent cathode ray device with improved color filtering system

Halos occurring around bright light spots generated by cathode ray tube devices in which the light emitted by the tubes is filtered by filtering solutions are significantly reduced by the addition of cinnamic alcohol and/or cinnamaldehyde to the solution.

Cathode ray tube device with improved color filtering system

The invention relates to a cathode ray tube device for generating a bright blue light of the type that is particularly useful for projection color television and information display. To filter out undesired radiation emitted by a silver-activated zinc sulfide phosphor, there is located in the path of blue radiation a concentrated solution of a soluble erbium salt and Methyl Violet 2B.

Blue luminescent cathode ray tube device with improved color filtering

A CRT device for generating a bright green light spot is shown. The device employs a terbium activated phosphor. Troublesome radiations emitted by the phosphor particularly in the 586 nm region are significantly decreased without significant decrease of the desired 544 nm radiation by use of a concentrated solution of a soluble praseodymium salt.

Green luminescing cathode-ray tube device

A filtering device for removing unwanted radiation from a green luminescing CRT comprises a solution of a soluble praseodymium salt, sodium fluorescein and Fast Green FCF.

Green luminescent cathode-ray tube device with improved color filtering

A large polycrystalline body of a 2,6 or 3,5 volatile compound is produced in a graphite crucible under low external pressure by passing a narrow molten zone through a charge of the compound contained in the graphite crucible the interior of which is coated with pyrolytic graphite. By a similar technique, but by use of a hot zone cooler then the molten zone, the polycrystalline body is converted to a monocrystalline body.

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Ossining, NY, United States of America

Brian J Fitzpatrick