North American Philips Corporation

Jacob Khurgin

Dagobert M De Leeuw

A device for doubling the frequency of electromagnetic radiation. The device includes a non-linear substrate having a non-linear optical waveguide of a differing refractive index disposed thereon. The waveguide layer includes an inverted polarization interface at which the direction of polarization of the waveguide abruptly changes in sign. Radiation directed across the device parallel to the plane of the inverted polarization interface will be doubled in frequency by the interface. The inverted polarization interface may be achieved in a number of ways. The interface may be directly grown on the substrate or a single layer waveguide may be cleaved and flipped over upon itself. Finally, the waveguide may be formed by the growth of asymmetric mirror image quantum wells on either side of a plane to form the interface.

Frequency doubling device

An image recording and readout device has a light-stimulable phosphor layer for storing a radiation image. The image is read out of the phosphor layer by scanning the layer with a laser beam. A filter is provided between the phosphor layer and the laser to increase the coupling of the laser light into the phosphor layer. The filter passes stimulating laser radiation within an angular acceptance range and reflects stimulating radiation outside the acceptance range.

Image recording and readout device based on light-stimulable phosphors

A faceplate arrangement for a monochromatic cathode ray tube includes a compound filter disposed between the faceplate and a light scattering luminescent screen. The compound filter includes a multilayer interference edge filter adjacent the screen and a multilayer matching filter adjacent the faceplate. The edge filter reflects back into the screen light rays received from the screen which would contribute to halo, and the matching filter matches the optical admittances of the edge filter and the faceplate.

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Croton-on-Hudson, NY, United States of America

Jacob Khurgin