There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.

Laser processing method

This paper describes a receiver front-end that is designed to realize multi-gigabit data communication via large-core plastic optical fiber (POF) in deep submicron CMOS technology A 3D system-level integration scheme and transistor level circuits have been proposed for such a low-cost, high-speed POF receiver With 44 mW (excluding output driver) DC power dissipated from a 12 V supply and an estimated 13 pF photo capacitance (C PD ) from a discrete, large-area (400 um) photo detector (PD), a data rate of 3 Gbps, with a sensitivity of −11 dBm (BER = 10−12), has been simulated in STMicroelectronics (STM) 65 nm low-power CMOS technology

Analog front-end for a 3 Gb/s POF receiver

A method of forming a filter element is disclosed comprising introducing a mixture into a feeder, the mixture comprising a plurality of susceptor particles and a plurality of polymeric binder particles. The mixture is advanced through the feeder and into a die comprising an excitation portion where eddy currents are induced in the susceptor particles by subjecting the mixture to a high-frequency electromagnetic field, the eddy currents being sufficient to elevate the temperature of the susceptor particles to cause adjacent polymeric binder particles to be heated to at least a softening point. The susceptor particles bind with the heated polymeric binder particles in the die to form a coherent mass. The coherent mass is advanced out of the die and cooled to form the filter element.

Method of forming filter elements

The present invention comprises: a plurality of collimating lenses (2a - 2e) that are arranged in a one-to-one relationship with a plurality of laser light sources (1a - 1e) which exhibit anisotropy in a laser light emission angle, and that convert laser light beams emitted from the laser light sources into parallel light; a condensing lens (4) that condenses the laser light that has been converted into parallel light by the plurality of collimating lenses; and an optical fiber (5) having a square waveguide core (SC) which has a square shape, the fiber receiving and synthesizing the laser light condensed by the condensing lens. A longitudinal axis of a condensed beam condensed by the condensing lens is aligned with a diagonal axis of the square waveguide core.

Light-synthesizing laser device

PROBLEM TO BE SOLVED: To provide a novel-structured fiber with an added rare earth element, and highly efficient fiber laser and fiber amplifier configured by using the fiber.SOLUTION: A fiber includes: a core glass of a high refractive index at a center part thereof, which is formed of SiO-based glass containing a rare earth element; a cladding of a low refractive index arranged around the outer periphery of the core glass, which is formed of SiO-based glass not containing the rare earth element; an air gap covering a large portion of the outer periphery of the cladding; SiOglass with added fluorine (F) arranged around the outer periphery of the air gap such that the SiOglass with added F covers the cladding while being in contact with the outer periphery of the cladding on at least three points; and SiO-based glass without added F arranged around the outer periphery of the SiOglass with added F.

Fiber with added rare earth element, fiber laser and fiber type amplifier using the same

PROBLEM TO BE SOLVED: To provide an optical fiber capable of high-speed communication which has excellent transparency and flexibility and in which a monomer for a core section contains trichloroethyl methacrylate as a main component.SOLUTION: An optical fiber comprises a core section and a cladding section arranged on the outer circumference of the core section. The core section comprises, as a main component, a polymer made of monomers which contain not less than 70 wt.% of trichloroethyl methacrylate(TCEMA), and the cladding section comprises, as a main component, a polymer made of monomers which contain not less than 20 wt.% of methyl methacrylate(MMA). Another optical fiber comprises a core section and a cladding section arranged on the outer circumference of the core section. The core section comprises, as a main component, a polymer made of monomers which contain not less than 70 wt.% of TCEMA, and the outer circumference of the cladding section is covered with a plastic which contains a polycarbonate as a main component.

Optical fiber and method for manufacturing the same

PROBLEM TO BE SOLVED: To provide a resin molding machine using induction heating which can secure uniform heating as well as contribute to reduction of energy cost, especially in induction heating to a thermoplastic synthetic resin. SOLUTION: A thermoplastic synthetic resin material is used as a raw material G. The resin molding machine is constituted so that a molten state of the raw material G by applying induction heating treatment, is injected into a predetermined mold M or directly extruded outside via a die. The resin molding machine is equipped with: a cylinder 20 in which the raw material G is charged; a screw 32 in an isolated state from the cylinder 20, which is concentrically mounted to interior of the cylinder 20 and rotates around an axial center to be driven by a driving means to forward the raw material G; and a high frequency generator 50 which applies high frequency to the raw material G in the cylinder 20 by the screw 32 as a counter electrode, which is a member of the cylinder 20 and a screw member 30. COPYRIGHT: (C)2009,JPO&INPIT

Resin molding machine and extrusion molding method

Disclosed is a gradient-index plastic optical fiber which is composed of a core portion and a cladding portion that is arranged around the core portion. The core portion is mainly configured of: a copolymer of a monomer that contains 55-95% by weight of 2,2,2-trifluoroethyl methacrylate (3FMA) and 5-45% by weight of methyl methacrylate (MMA); and a dopant that has a higher refractive index than the copolymer and is compatible with the copolymer. The cladding portion is mainly configured of a polymer of a monomer that contains more than 55% by weight but 100% by weight or less of 3FMA and 0% by weight or more but less than 45% by weight of MMA. The 3FMA content in the polymer is set to be higher than the 3FMA content in the copolymer of the core portion.

Gradient-index plastic optical fiber

PROBLEM TO BE SOLVED: To provide a manufacturing method of a polyvinyl chloride resin based optical transmission body which can be formed optimal in refractivity distribution with improved productivity. SOLUTION: This manufacturing method includes a step of heat treating a polyvinyl chloride-based resin optical transmission body of a coaxial bilayer structure composed of an inner layer made of a polyvinyl chloride resin and one or more sorts of transparent and diffusible additives higher than this resin in refractivity with a Tg of 60-110°C, and an outer layer made of a polyvinyl chloride resin and one or more sorts of transparent and diffusible additives lower than this resin in refractivity with a Tg of 80-130°C and whose Tg is higher by 20°C than that of the inner layer to diffuse the above additive to the outer or center areas of the optical transmission body, and forming an area continuously changing its refractivity. COPYRIGHT: (C)2008,JPO&INPIT

Method for manufacturing polyvinyl chloride resin based optical transmission body

PROBLEM TO BE SOLVED: To provide a method of manufacturing a plastic optical transmission member, capable of attaining an arbitrary diffusion condition in a short time, facilitating control of a refractive index distribution, and minimizing deterioration of a resin as well as improving productivity. SOLUTION: The plastic optical transmission member is of a coaxial multilayer structure constituted by containing a transparent resin and one or more kinds of additives that have a different refractive index from the transparent resin and that are transparent as well as diffusible. The method of manufacturing the plastic optical transmission member includes processing under carbon dioxide gas atmosphere pressurized in the range of 4-6 MPa, diffusing the additives to the periphery or the center of the plastic optical transmission member, and forming a region where a refractive index continuously varies. COPYRIGHT: (C)2008,JPO&INPIT

多鶴岡本

Papers

Optical fiber and method for manufacturing the same

Resin molding machine and extrusion molding method

Gradient-index plastic optical fiber

Method for manufacturing polyvinyl chloride resin based optical transmission body

Method of manufacturing plastic optical transmission member

多鶴 岡本

Papers

Optical fiber and method for manufacturing the same

Resin molding machine and extrusion molding method

Gradient-index plastic optical fiber

Method for manufacturing polyvinyl chloride resin based optical transmission body

Method of manufacturing plastic optical transmission member

多鶴岡本