Ngk Insulators, Inc.

Ngk Optoceramics Co., Ltd.

Ngk Ceramic Device Co., Ltd.

Yuichi Iwata

Jungo Kondo

Tetsuya Ejiri

Kenji Aoki

Osamu Mitomi

Shoichiro Yamaguchi

Naotake Okada

Keiichiro Asai

Akira Hamajima

Kengo Suzuki

Takashi Yoshino

Akiyoshi Ide

Yudai Uno

Makoto Iwai

Atsuo Kondo

Keiji Matsuhiro

Shuhei Higashihara

Taku Nishigaki

Kengo c/o Ngk Optoceramics Co Ltd Suzuki

A phosphor element includes an incident face for an excitation light, an emitting face opposing the incident face and a side face, and the element converts at least a part of the incident excitation light incident onto the incident face to fluorescence and emits the fluorescence from the emitting face. The emitting face has an area larger than an area of the incident face. The phosphor element comprises an inclination region in which an inclination angle of the side face with respect to a vertical axis perpendicular to the emitting face is monotonously increased from the incident face toward the emitting face, viewed in a cross-section perpendicular to the emitting face and along the longest dividing line halving the emitting face.

Phosphor element, phosphor device, and illumination apparatus

A phosphor element includes an incident face for an excitation light, a reflecting face opposing the incident face and a side face, and the phosphor element converts at least a part of the excitation light incident onto the incident face into a fluorescence and emits the fluorescence from the incident face. The incident face has an area greater that an area of the reflecting face. The phosphor element includes an inclination region in which an inclination angle of the side face with respect to a vertical axis perpendicular to the incident face is monotonously increased from the reflecting face toward the incident face, viewed in a cross-section perpendicular to the incident face and along the longest dividing line halving the incident face.

Phosphor element, phosphor device, and illumination device

A phosphor element includes: a phosphor part having an incident face for excitation light, an opposing face opposing the incident face, and a side face, the phosphor part converting at least a part of the excitation light incident onto the incident face into a fluorescence and emitting the fluorescence from the incident face; an integral low refractive index layer on the side face and opposing face of the phosphor part and having a refractive index lower than that of the phosphor part; and an integral reflection film covering a surface of the low refractive index layer. The area of the incident face of the phosphor part is larger than the area of the opposing face.

Phosphor element and lighting device

A white light generating device, for generating white light from an excitation light of a laser light having a wavelength of from 280 nm-495 nm, includes a fluorescent body generating a fluorescence having a wavelength longer than a wavelength of the excitation light. The fluorescent body includes an emission-side end surface emitting excitation light and fluorescence, an opposing end surface on an opposite side of the emission-side end surface, and an outer peripheral surface. The emission-side end surface has an area larger than an area of the opposing end surface, and the outer peripheral surface of the fluorescent body includes a part inclined with respect to a central axis of the fluorescent body by from 3.4&#xb0;-23&#xb0; over an entire periphery of the fluorescent body. The emission-side end surface has an area of from 0.3 mm-1.52 mm.

White-light generating device with fluorescent body with inclined side surface

Phosphor element, method for producing same, and lighting device

An optical waveguide structure includes an optical waveguide, a reflection film provided on the optical waveguide and reflecting a light propagating in the optical waveguide, a metal film provided on the reflection film, and a surface oxidized film provided on the metal film and generated by surface oxidation of the metal film.

Optical waveguide structure, phosphor element, and method for manufacturing optical waveguide structure

A phosphor element comprises: a support substrate; an optical waveguide for propagating an excitation light through the waveguide, the optical waveguide comprising a phosphor generating a fluorescence, and the optical waveguide comprising an emission side end surface emitting the excitation light and the fluorescence, an opposing end surface opposing the emission side end surface, a bottom surface, a top surface opposing the bottom surface and a pair of side surfaces; a bottom surface side clad layer covering the bottom surface of the optical waveguide; a top surface side clad layer covering the top surface of the optical waveguide; side surface side clad layers covering the side surfaces of the optical waveguide, respectively; a top surface side reflection film covering the top surface side clad layer; side surface side reflection films covering the side surface side clad layers, respectively; and a bottom surface side reflection film provided between the support substrate and the bottom surface side clad layer.

Phosphor element and illumination device

Provided a terahertz-wave detection element with high spatial resolution and suppressing a crack occurrence. A method of manufacturing the detection element capable of detecting a spatial intensity distribution of a terahertz wave includes: a step of forming an oxide layer on one main surface of a first substrate consisting of an electro-optic crystal; a step of joining the one main surface of the first substrate and a second substrate by an adhesive consisting; a step of thinning the first substrate of a joined body, to a thickness of 1-30 &#x3bc;m by polishing the first substrate; and a step of obtaining a large number of terahertz-wave detection elements by cutting the joined body. The oxide layer is formed such that the first substrate becomes convex to a side of the one main surface by causing a tensile stress to act on it.

Terahertz-wave detection element, manufacturing method therefor, and observation apparatus

A device for irradiating an electromagnetic wave irradiates an electromagnetic wave having a target frequency in a range of 0.1 THz to 30 THz to the outside of a non-linear optical crystal. The device includes a main body composed of a non-linear optical crystal and a sub wavelength grating structure formed on a surface of the main body. The sub wavelength grating structure includes column shaped bodies regularly arranged on a surface of the main body. Each of the column shaped bodies includes a constant width part having a constant width and a base part provided from the surface toward the constant width part. A surface of the base part has a shape of an arc having a center of curvature in the outside of the base part viewed in a cross section of the column shaped body cut along a direction in which the column shaped bodies are arranged.

Electromagnetic wave radiation element and method for producing same

An optical modulation deviceincludes a supporting bodyincluding a pair of groovesand a protrusionbetween the grooves, a ridge parincluding a channel type optical waveguide capable of multi mode propagation, a first side plate partA formed in a first side of the ridge part, a second side plate partB formed in a second side of the ridge part, a first adhesive layerA adhering the first side plate partA and the supporting body, a second adhesive layerB adhering the second side plate partB and the supporting body, and a third adhesive layerC adhering the ridge partand the protrusion. The devicefurther includes a first electrodeA provided on a side faceof the ridge part on the first groove side, and a side faceand an upper faceof the first side plate part, and a second electrodeB provided on a side faceof the ridge partin the second groove side, the second grooveand a side faceand an upper faceof the second side plate partB. The first electrodeA and the second electrodeB apply a modulation voltage modulating light propagating in the channel type optical waveguide.

Optical modulation element

It is provided a device oscillating an electromagnetic wave having a target frequency of 0.1 THz to 30 THz. The device includes a main body made of a non-linear optical crystal and a sub-wavelength grating structure formed on the main body. The sub-wavelength grating structure includes protrusions arranged in first direction 'X' and second direction 'Y' on the main body, first groovesX each provided between the adjacent protrusions and extending in the first direction, and second groovesY each provided between the adjacent protrusions and extending in the second direction. Each of the protrusions includes a pair of first faces opposing in the first direction &#x201c;X&#x201d; with each other and a pair of second faces opposing in the second direction &#x201c;Y&#x201d; with each other. The width of the first face is made smaller from the main bodytoward an upper endof the protrusion

Electromagnetic wave oscillating devices and a method of producing the same

An optical waveguide device includes a ferroelectric layer having a thickness of 4 &#x3bc;m-7 &#x3bc;m; a supporting body; and an adhesive layer adhering a bottom face of the ferroelectric layer and supporting body. The ferroelectric layer includes a ridge comprising a channel optical waveguide, first and second protuberances on opposite sides of the ridge, inner grooves between the ridge and protuberances, respectively, and outer grooves outside of the protuberances, respectively. The outer groove is deeper than the inner groove. The ridge portion has a width of 6.6 &#x3bc;m-8.5 &#x3bc;m, a distance of an outer edge of the first protuberance and an outer edge of the second protuberance is 8.6 &#x3bc;m-20 &#x3bc;m, the inner groove has a depth of 2.0 &#x3bc;m-2.9 &#x3bc;m, and the outer groove has a depth of 2.5 &#x3bc;m-3.5 &#x3bc;m.

Optical waveguide devices and harmonic wave generating devices

It is provided a wavelength converting device oscillating an idler light having a wavelength of 5 to 10 &#x3bc;m from a pump light. The wavelength of the idler light is longer than that of the pump light. The wavelength converting device includes a wavelength converting layerof a semiconductor non-linear optical crystal and having a thickness of 50 &#x3bc;m or smaller. The wavelength converting layerincludes a crystal orientation inversion structure wherein crystal orientation of the optical crystal is inverted at a predetermined period and at least one flat main face. The device further includes a Peltier devicecontrolling a temperature of the wavelength converting layer; and a clad portionjoined with the flat main faceof the wavelength converting layerand provided between the wavelength converting layerand the Peltier device. The pump light, idler light and signal light satisfies a particular phase matching condition.

Semiconductor wavelength converting devices and light sources for generating infrared rays

A device of oscillating an electromagnetic wave having a frequency of 0.1 THz to 3 THz from pump and idler waves by parametric effect. The device includes a supporting body, an oscillating substrate of a non-linear optical crystal, an adhesive layer adhering the supporting body and the oscillating substrate, and a film for reflecting the electromagnetic wave formed on a surface of the supporting body on the side of the adhesive layer. The oscillating substrate has an upper face, a bottom face and an incident face on which the pump wave is made incident, with the adhesive layer having a refractive index with respect to the pump wave lower than that of the oscillating substrate.

Electromagnetic wave oscillating devices

An oscillating device includes an oscillating substrate of a non-linear optical crystal and having an incident face where a pump wave and an idler wave are made incident; a first waveguide provided in the oscillating substrate and between the incident face and an interacting part of the pump wave and idler waves; and a second waveguide provided in the oscillating substrate and between the incident face and the interacting part. The first waveguide guides the pump wave and the second waveguide guides the idler wave.

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Nagoya, Japan

Yuichi Iwata