Sumitomo Electric Industries, Limited

Pioneer Electronic Corporation

Sumitomo Electric Printed Circuits, Inc.

Naota Uenishi

Takafumi Uemiya

Yasuhiro Hattori

Akira Mizoguchi

Shinsuke Umegaki

Yo Shimizu

Yasuji Ogaki

Kiyofumi Chikuma

Jun Sugawara

Sota Okamoto

Michiru Kubata

Shingo Kaimori

Teruo Tohma

Yasuzi Ohgaki

Syougo Asai

Takuma Yoshisaka

Yasuji Oogaki

Provided are an adhesive resin composition that is halogen-free, has good adhesiveness, solder heat resistance, and flame retardancy, and has good flow characteristics, and a laminate and a flexible printed wiring board using the same. The adhesive resin composition contains a phosphorus-containing epoxy resin and/or a phosphorus-containing phenoxy resin, a phosphorus-containing polyester resin having a weight-average molecular weight of more than 20,000 and 150,000 or less, another thermoplastic resin, and a curing agent. The adhesive resin composition preferably further contains a benzoxazine compound. Preferably, substantially no inorganic filler is mixed in the adhesive resin composition.

Adhesive resin compositions, and laminates and flexible printed wiring boards using same

A method for producing an organic crystal is disclosed. One embodiment comprises maintaining a capillary tube containing a fused liquid of an organic crystal material and having a fused liquid reservoir at one end thereof at a temperature not less than the fusion point of the organic crystal material together with the fused liquid reservoir, reducing the temperature of the fused liquid in the fused liquid reservoir to precipitate seed crystals, and then slowly cooling the capillary tube successively from the end toward the other end to allow a single crystal to grow from the seed crystal in the capillary tube. Because of the large quantity of the fused liquid, a seed crystal can be formed and allowed to grow even from a fused liquid of an organic crystal material which hardly crystallizes in the form of a fused liquid. Another embodiment comprises charging a solution of an organic crystal material in a capillary tube under heat, rapidly reducing the temperature of one end of the capillary tube to precipitate polycrystals, and then slowly cooling the capillary tube successively from the end toward the other end to allow a single crystal to grow from the polycrystal as a seed crystal. A seed crystal grows from a solution of an organic crystal material under control of crystal form to obtain a single crystal which has no inversion symmetry center, is free from lattice defect or rearrangement, and less causative of a laser beam loss.

Method for producing organic crystal and crystal growth cell therefor

An optical wavelength conversion module having a laser light source, a lens system for managing the laser beam, and a conversion element. The laser light source generates a beam of laser light of a substantially circular cross-section having an aspect ratio of 1.3 or less. The substantially circular beam is collimated and condensed by the lenses and directed into the core of the conversion element which then emits converted light. The optical wavelength conversion module is small in size and produces converted light with high efficiency.

Optical wavelength conversion module

An optical fiber device comprising an optical fiber comprising a core made of an organic crystal and a cladding made of glass, the device generating second harmonics of a laser light that has been launched into the core, the device further comprising a buffer layer on at least one end faces of the optical fiber, and a water barrier layer on the surface of the buffer layer, the buffer layer being such that the organic crystal of the core is not dissolved therein.

Optical fiber device

A fiber-type wavelength converting device comprises a nonlinear optical crystal core; and a glass cladding surrounding the core that produces a second harmonic utilizing Cherenkov radiation. An exit end face of the cladding is flat, and an exit end face of the core has asperities. The exit end face of the core is formed inside with respect to the exit end face of the cladding, and particles may be filled in a recess portion composed of a bottom surface of the exit end face of the core and side surface of an inner wall of the cladding. The cladding has an outer diameter of at least 1 mm to prevent breakage of device upon polishing and grinding. A thin film may be formed on an input end face of the device.

Harmonic generating device

An apparatus and method of manufacturing a wavelength converter of an optical fiber type, having a core and a clad covering the core. At least one of the core and clad is made of a nonlinear optical material such that copious amounts of second harmonic light are emitted form a light emitting end face of the optical fiber. Grooves and/or flanges are formed in or on the clad or a transparent layer covering the clad. The transparent layer also covers the light emitting end face of the optical fiber. A collimating surface is formed on the transparent layer at the light emitting end face for collimating the second harmonic light emitted. Various molds are used to form different collimating surfaces, grooves, and flanges in and on the transparent layer.

Wavelength converter

An optical wavelength conversion module includes a semiconductor laser light source; a lens for focusing semiconductor laser light; and a fiber-type optical wavelength converter with a core and a clad having a refractive index lower than the core. At least one of the core and clad is formed of a non-linear optical material. The number of longitudinal modes of oscillation of the semiconductor laser light source is not less than three.

A light source unit for receiving and transmitting information to and from an optical disk or the like, which reshapes an elliptical in cross-section beam of laser light into a circular in cross-section beam of laser light by a beam shaping assembly composed of at least one lens having a cylindrical surface and an optical axis, the cylindrical surface having generatrix lines that are perpendicular to the optical axis of the lens, where the circularly shaped beam of laser light then enters a wavelength converter for generation of a second harmonic (half wavelength of the fundamental).

Light-source unit

In a wavelength converter, nonlinear medium layers containing material having an increased second order susceptibility, and linear medium layers, not containing material having a nonlinear optical characteristic of the second degree, are alternatively layered. A fundamental wave (of which the angular frequency is .omega.) is incident on the multi-layered structure in a direction normal to the major surfaces of the nonlinear medium layers and the linear medium layers, thereby generating the second harmonic of the fundamental wave (of which the angular frequency is 2.omega.). The thickness of each of the linear and nonlinear medium layers is selected to be an odd-number times as long as the coherence length. The wavelength can be converted utilizing the diagonal element d.sub.ii of the second degree, nonlinear optical tensor.

A light source device that converts a beam of light radiated from an optical fiber-type second-harmonic generating element to a parallel beam of light filled with a bundle of rays up to a central portion of the parallel beam by causing a portion of the beam of light to pass through an apex of a conical surface. The light source device is unlikely to be affected by the spherical aberrations of members constituting an optical system such as lenses, which makes it unnecessary to make the component members of the optical sysem special, thereby simplifying the optical system.

Optical wavelength converter device

A method for the production of a thin film on an end surface of a fiber made up of a core of an organic material, and a clad made of glass. This method involves the steps of placing the fiber in a vacuum chamber, reducing the pressure in the chamber, cutting the fiber under reduced pressure, and either simultaneously, or immediately after cutting the fiber, forming a thin film on the cut surface of the fiber.

Method of forming thin film on fiber end surface by breaking it in a

A method of coating the ends of a fiber wavelength-conversion element with a macromolecular film. This serves to protect the crystal core and change in quality without changing the state of the core end surface.

Apparatus and method of producing fiber wavelength-conversion element

A fiber type wavelength converter comprising a cladding made of a thin glass tube an inner wall of which is coated with a coupling agent, and a core which is contained in the cladding and made of a single crystal of methyl 4-hydroxybenzoate, which can convert a fundamental wave to a second harmonic effectively.

Fiber type wavelength converter and module

A device for generating a second harmonic from a laser source is disclosed. The light from the laser passes through an optical fiber in which the second harmonic is generated. The light exiting from the optical fiber has a conical wave surface which is incident upon a collimating lens. Because the collimating lens has a diffraction lattice formed thereon, it is easy and efficient to collimate the second harmonic. It is also possible to decrease the size of the apparatus due to the use of the diffraction lattice formed on the collimator lens. This enable such a device to be particularly useful with a small sized light source such as a semiconductor laser.

Light source device

An arrangement for generating light at a second harmonic of an input light at a fundamental frequency/wavelength. Light at the fundamental frequency/wavelength is generated by a laser and impinges upon an input end of an optical fiber. The optical fiber has a non-linear optical characteristic and generates a second harmonic of the input light. The second harmonic which exits the fiber has an axisymmetrical and conical equiphase wave surface. A collimator lens collimates the second harmonic and parallel light rays are produced on the output side of the lens.

Growing community of inventors

Osaka, Japan

Naota Uenishi