Inter-university Research Institute Corporation National Institutes of Natural Sciences

Hamamatsu-photonics K.k.

Genesis Research Institute, Incorporated

Other

Ricoh Company, Ltd.

Mitsubishi Denki Kabushiki Kaisha

Denso Corporation

National Institutes of Natural Sciences

Toyota Jidosha Kabushiki Kaisha

Nippon Soken, Inc.

Mitsubishi Cable Industries, Ltd.

Oxide Corporation

Inter-university Research Institute Corporation National Institute of Natural Sciences

Takunori Taira

Arvydas Kausas

Hirofumi Kan

Shigeo Asai

Hiroshi Sakai

Lihe Zheng

Jun Akiyama

Kenji Kanehara

Kunihiko Hara

Tsuyoshi Suzudo

Yoichi Sato

Akihiro Sone

Rakesh Bhandari

Shuhei Yamamoto

Akimitsu Sugiura

Yoshihito Hirano

Hirokazu Taniguchi

Tohru Yoshinaga

Akio Miyamoto

Yasunori Furukawa

Jiro Korematsu

Makoto Matsukura

Sadao Matsumura

Sunao Kurimura

Nicolaie Pavel

Voicu Lupei

Ichiro Shoji

Hwan Hong Lim

Hideki Ishizuki

Simon Joly

Weipeng Kong

Junichi Nabekura

Vincent Yahia

Masaki Tsunekane

Osamu Nakamura

Shinya Watanabe

Hiroaki Wake

Yukinobu Anezaki

Aki Abe

A method of producing a substance includes a producing step of producing a new substance by, in a state in which a raw material absorbing giant pulse laser light is disposed inside a base material or in a state in which the base material and the raw material are brought into contact with each other and are clamped together, performing irradiation with the giant pulse laser light such that the raw material absorbs the giant pulse laser light and thereby generating shock waves such that at least the raw material undergoes phase transition.

Method of producing substance

A crystal quartz element includes a main face provided with a plurality of polarity inverted regions and a polarity non-inverted region, the plurality of polarity inverted regions are spaced apart from each other via the polarity non-inverted region, and the main face is a plane face. A method for manufacturing a crystal quartz element includes: preparing a crystal quartz body including a first main face which is a plane face, and a first pressing jig including a first pressing face on which a plurality of first projections are provided; and forming a plurality of polarity inverted regions corresponding to the plurality of first projections in the crystal quartz body by heating and pressing the first main face by the first pressing face.

Crystal element, method for manufacturing same, and optical oscillation device including crystal element

A method for manufacturing an optical element is a method for manufacturing an optical element in which laser light is transmitted, reciprocated, or reflected, and the method includes a first step of obtaining a bonded element formed by subjecting a first element part and a second element part, both being transparent to laser light, to surface activated bonding with a non-crystalline layer interposed therebetween; and after the first step, a second step of crystallizing at least a portion of the non-crystalline layer by raising the temperature of the bonded element. In the second step, the temperature of the bonded element is raised to a predetermined temperature that is lower than the melting points of the first element part and the second element part.

Method for manufacturing optical element and optical element

A method for manufacturing an optical element includes a bonding step of bonding a first and a second element portion to each other without interposing an adhesive therebetween. The bonding step includes: a first step of fixing the first and the second element portion with an intermediate layer disposed between these portion, the intermediate layer containing an element substitutable for a constituent element of a bonded portion in the first and the second element portion, the intermediate layer being colored; and a second step of integrating a part of the intermediate layer with the first and the second element portion, and making a part of the intermediate layer transparent to laser light by irradiating the intermediate layer with giant pulse laser light and causing it to be absorbed into the intermediate layer after the first step.

A translucent in-vivo indwelling device with a translucent region including a rare earth doped fluorapatite.

Translucent in-vivo indwelling device and utilization thereof

To provide a laser ignition device in which the ignition efficiency is improved and the laser pulse energy necessary for ignition is minimized by optimizing the pulse time width of laser. The laser ignition device includes: a pulse laser oscillatorconfigured to output a beam having a wavelength &#x3bb; [&#x3bc;m] and a beam quality M; an energy controllerconfigured to control energy of pulse laser outputted from the pulse laser oscillator; a lenshaving a focal length f [mm] and configured to focus the pulse laser outputted from the pulse laser oscillator; and a pulse time width controllerconfigured to control a time width of the pulse laser, wherein the pulse time width controllercontrols the time width of the pulse laser to be 0.6 to 2 ns.

Laser ignition device

A laser component is provided, including a laser medium and a transparent heat transmitting member, at least one of which is oxide. Bonding surfaces of the laser medium and the transparent heat transmitting member are exposed to oxygen plasma, and thereafter the bonding surfaces are brought into contact without heating. The laser medium and the transparent heat transmitting member are bonded at atomic levels, their thermal resistance is low, and no large residual stress is generated due to the bonding taking place under normal temperature. The process of oxygen plasma exposure ensures transparency of their bonding interface. The laser medium and the transparent heat transmitting member are stably bond via an amorphous layer.

Laser component

A laser ignition device capable of achieving stable ignition, preventing deterioration of a semiconductor laser element is provided, by suppressing the intensity of oscillated light leakage leaking towards semiconductor laser side from the laser resonator with a simple configuration. A laser ignition deviceincludes an excitation light sourceemitting coherent excitation light L, an optical elementtransmitting excitation light L, a laser resonatoroscillating oscillated light having high energy density by being irradiated with excitation light L, and condensing meanscondensing the oscillated light Loscillated by the laser resonator. Moreover, the laser ignition deviceis provided with a light-transmissive-reflective filmdisposed between the excitation light sourceand the laser resonator. The light-transmissive-reflective filmpermeating the excitation light Lhaving short wavelength and reflecting oscillated light leakage Lhaving long wavelength.

Laser ignition device provided with transmissive reflective film

Both of multi-mode laser beamA and excitation beamA for amplification are imputed to an amplification gain mediumin a relationship in which their optical axes match each other and an effective beam diameter of the excitation beam for amplification is smaller than an effective beam diameter of the multi-mode laser beam. As a result, laser beam of a part of modes progressing in a radiation range of the excitation beamA for amplification is selectively amplified. Laser beamA subjected to mode cleaning is thereby outputted.

Selective amplifier

Provided is a passive Q-switch laser device possessing a power density controller () making power density of excitation light from an excitation light source () equal to or greater than power density so that delay time required for reaching oscillation after start of excitation of a laser gain medium () becomes equal to or shorter than a laser upper energy level lifetime of the laser gain medium ().

Passive Q-switch laser device

Upon producing a transparent polycrystalline material, a suspension liquid (or slurry) is prepared, the suspension liquid being made by dispersing a raw-material powder in a solution, the raw-material powder including optically anisotropic single-crystalline particles to which a rare-earth element is added. A formed body is obtained from the suspension liquid by means of carrying out slip casting in a space with a magnetic field applied. On this occasion, while doing a temperature control so that the single-crystalline particles demonstrate predetermined magnetic anisotropy, one of static magnetic fields and rotary magnetic fields is selected in compliance with a direction of an axis of easy magnetization in the single-crystalline particles, and is then applied to them. A transparent polycrystalline material is obtained by sintering the formed body, the transparent polycrystalline material having a polycrystalline structure whose crystal orientation is controlled.

Transparent polycrystalline material and production process for the same

When an excitation light is entered in a laser medium including a doped (containing rare earth element) YAG, the vicinity of the excitation light entry face is locally heated which generates a birefringence, causing degradation of linear polarization of emitted laser. To avoid such a phenomenon, it was necessary to make the excitation light pulsed and slow down the repetition rate of the pulse. In this device, an undoped YAG is bonded to a excitation light entry face of the laser medium made of a doped YAG. By arranging the YAG &#x3c;100&#x3e; axis so as to extend along the optical axis of the laser oscillation system, a linearly polarized pulse laser can be obtained.

Q-switched laser device

Provided is a method for manufacturing a translucent polycrystalline material with optical properties continuously varying in the material. A slurry including single crystal grains that are acted upon by a force when placed in a magnetic field is immobilized in a gradient magnetic field with a spatially varying magnetic flux density and then sintered. For example, where a slurry including single crystal grains of YAG doped with Er and single crystal grains of YAG undoped with a rare earth material is immobilized in the gradient magnetic field, the region with a strong magnetic field becomes a laser oscillation region that is rich in Er-doped YAG, whereas the region with a weak magnetic field becomes a translucent region rich in YAG undoped with a rare earth material. A polycrystalline material having a core with laser oscillations and a guide surrounding the core are obtained at once.

Translucent polycrystalline material and manufacturing method thereof

To provide a passive Q-switch-type solid laser apparatus for outputting a high peak-power pulse laser whose pulse energy is large and pulse-time width is small. A passive Q-switch-type solid laser apparatus has: two reflection elements for forming an oscillator; a solid gain medium being disposed between the two reflection elements; a saturable absorber being disposed between the two reflection elements; an excitation device for exciting the solid gain medium; and a cross section control device for making at least one of a stimulated emission cross section of the solid gain medium and an absorption cross section of the saturable absorber closer to another one of them; and the cross section control device is equipped with at least one or both of a temperature control device for retaining the solid gain medium at a predetermined temperature and an oscillatory-wavelength control device for fixating an oscillatory wavelength at a predetermined wavelength.

Passive Q-switch-type solid laser apparatus

A solid laser apparatus which includes: two reflection elements for forming an oscillator; a plate-shaped gain medium being disposed between the two reflection elements, thereby augmenting a stimulated emission light in a thickness-wise direction; a doughnut- or deformed-doughnut-type planar waveguide being disposed so as to make an inner peripheral face thereof come in contact with an outer peripheral face of the plate-shaped gain medium; and a plurality of excited-light sources being directed in five or more directions, the excited-light sources being coupled to an outer peripheral face of the doughnut- or deformed-doughnut-type planar waveguide so as to make excited lights propagate from the outer peripheral face of the doughnut- or deformed-doughnut-type planar waveguide to the plate-shaped gain medium.

Solid laser apparatus

Growing community of inventors

Okazaki, Japan

Takunori Taira